{"id":5983,"date":"2026-05-20T17:41:31","date_gmt":"2026-05-21T01:41:31","guid":{"rendered":"https:\/\/haifengmachine.com\/?p=5983"},"modified":"2026-05-25T22:44:01","modified_gmt":"2026-05-26T06:44:01","slug":"pu-shoe-sole-formulation-raw-materials-guide","status":"publish","type":"post","link":"https:\/\/haifengmachine.com\/ru\/pu-shoe-sole-formulation-raw-materials-guide\/","title":{"rendered":"Factory Startup Must-Read: Practical Guide to PU Shoe Sole Formulation and Raw Material Management [Part 1: Materials &amp; Chemistry]"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"5983\" class=\"elementor elementor-5983\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a647234 e-flex e-con-boxed e-con e-parent\" data-id=\"a647234\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8da0086 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"8da0086\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;marker_view&quot;:&quot;bullets&quot;,&quot;icon&quot;:{&quot;value&quot;:&quot;fas fa-dot-circle&quot;,&quot;library&quot;:&quot;fa-solid&quot;,&quot;rendered_tag&quot;:&quot;&lt;svg class=\\&quot;e-font-icon-svg e-fas-dot-circle\\&quot; viewBox=\\&quot;0 0 512 512\\&quot; xmlns=\\&quot;http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\&quot;&gt;&lt;path d=\\&quot;M256 8C119.033 8 8 119.033 8 256s111.033 248 248 248 248-111.033 248-248S392.967 8 256 8zm80 248c0 44.112-35.888 80-80 80s-80-35.888-80-80 35.888-80 80-80 80 35.888 80 80z\\&quot;&gt;&lt;\\\/path&gt;&lt;\\\/svg&gt;&quot;},&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&quot;],&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__8da0086\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__8da0086\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t<div id=\"elementor-toc__8da0086\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-484fe95 e-flex e-con-boxed e-con e-parent\" data-id=\"484fe95\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3ca3daa elementor-widget elementor-widget-heading\" data-id=\"3ca3daa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why is producing polyurethane (PU) shoe soles considered the ultimate test of PU casting technology?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21fcad3 elementor-widget elementor-widget-text-editor\" data-id=\"21fcad3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Because microcellular elastomers demand exceptionally strict chemical control over A\/B material ratios, mold temperatures, and demolding times. In this guide, Haifeng Polyurethane Machinery&#8217;s Chief Engineer reveals the unvarnished realities of the workshop floor. From the correct 50-70\u00b0C melting process for crystallized B-material (MDI) to the commercial trade-offs between manual Catalyst (C-material) addition and pre-mixed fully formulated polyols. We also dissect the brutal cost battle between low-end toxic solvents (Methylene Chloride\/DMF) and Haifeng&#8217;s high-end water-based release agents used in top-tier supply chains. Whether you are navigating the global phase-out of 141B blowing agents or fixing daily A\/B ratio drift, this guide provides the hardcore engineering data you need for highly profitable footwear production.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5ee10ba elementor-widget elementor-widget-image\" data-id=\"5ee10ba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"501\" src=\"https:\/\/haifengmachine.com\/wp-content\/uploads\/2026\/05\/Polyurethane-shoes-soles-haifeng-1024x641.jpg\" class=\"attachment-large size-large wp-image-5990\" alt=\"Polyurethane shoes soles haifeng\" srcset=\"https:\/\/haifengmachine.com\/wp-content\/uploads\/2026\/05\/Polyurethane-shoes-soles-haifeng-1024x641.jpg 1024w, https:\/\/haifengmachine.com\/wp-content\/uploads\/2026\/05\/Polyurethane-shoes-soles-haifeng-300x188.jpg 300w, https:\/\/haifengmachine.com\/wp-content\/uploads\/2026\/05\/Polyurethane-shoes-soles-haifeng-768x481.jpg 768w, https:\/\/haifengmachine.com\/wp-content\/uploads\/2026\/05\/Polyurethane-shoes-soles-haifeng-18x12.jpg 18w, https:\/\/haifengmachine.com\/wp-content\/uploads\/2026\/05\/Polyurethane-shoes-soles-haifeng.jpg 1280w\" sizes=\"(max-width: 800px) 100vw, 800px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-90683dd elementor-widget elementor-widget-heading\" data-id=\"90683dd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">1. Why Are Polyurethane (PU) Shoe Soles the \"Hard Bone\" of PU Casting?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b4be6cf elementor-widget elementor-widget-text-editor\" data-id=\"b4be6cf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Many new investors entering the footwear industry assume that buying a casting machine and pouring chemicals into a mold will automatically yield perfect shoe soles. From an engineering perspective, this is a catastrophic misconception.<\/p><p>In the realm of polyurethane manufacturing, a standard two-component PU casting machine can produce flexible foam (sponges) or rigid foam (insulation) with relative ease. These applications primarily utilize TDI or PAPI, which offer a high tolerance for operational errors. However,\u00a0<strong>PU shoe soles are microcellular elastomers<\/strong>, which predominantly rely on an MDI (Methylene Diphenyl Diisocyanate) system. MDI has an extremely narrow operational window and is hyper-sensitive to temperature fluctuations.<\/p><p>Shoe sole production is a highly continuous, fast-paced assembly line operation. It strictly requires the injected liquid material to achieve a very high demolding strength within a brief window of\u00a0<strong>3 to 5 minutes<\/strong>. Furthermore, because shoe soles are highly visible exterior components, the surface must be absolutely flawless\u2014tolerating zero micro-bubbles, shrinkage, or color deviations. This combination of an ultra-narrow chemical reaction window and draconian aesthetic requirements makes PU shoe sole casting the true &#8220;touchstone&#8221; of polyurethane craftsmanship.<\/p><p>To conquer this business, you must first completely master your raw materials from the ground up.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b7ab2c6 elementor-widget elementor-widget-heading\" data-id=\"b7ab2c6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">2. Core Raw Material Breakdown: The True Workshop Definitions of A, B, and C Materials<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13107d7 elementor-widget elementor-widget-text-editor\" data-id=\"13107d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>During our on-site technical training at Haifeng, we strip away the complex academic jargon and define these three core materials for factory operators in practical, functional terms:<\/p><ul><li><strong>Component A (Polyol System):<\/strong>\u00a0Primarily composed of polyester or polyether polyols. We call this the &#8220;flesh&#8221; of the shoe sole. It dictates the base physical properties: abrasion resistance, flexibility, and overall structural volume.<\/li><li><strong>Component B (Isocyanate \/ MDI):<\/strong>\u00a0Primarily refined MDI (liquefied MDI). In footwear applications, Component B is often pre-reacted with a small amount of Component A, which is why workshop technicians frequently refer to it as a &#8220;prepolymer.&#8221; This is the &#8220;skeleton&#8221; of the shoe sole, providing the necessary hardness, tensile strength, and structural rigidity.<\/li><li><strong>Component C (Catalyst \/ Additives):<\/strong>\u00a0These are the reaction accelerators. When ambient temperatures are high and the mold is hot, Component C should be used at its minimum limit to prevent premature curing. Conversely, in freezing winter conditions where the reaction naturally slows down, Component C must be pushed to its maximum limit to maintain production speed.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c82f7e5 elementor-widget elementor-widget-heading\" data-id=\"c82f7e5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">3. Fatal Workshop Pain Point 1: What to Do When B-Material (MDI) Freezes? (Never Apply Direct Heat)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4524d7a elementor-widget elementor-widget-text-editor\" data-id=\"4524d7a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"21\">MDI is a highly temperamental chemical. When the ambient temperature drops below 20\u00b0C (depending on the specific chemical formulation), Component B will begin to crystallize and freeze. Crystallized MDI becomes rock-hard. If an operator forcefully attempts to pump it, it will not only block the entire hydraulic pipeline but can instantly shatter the high-precision gear pumps inside your casting machine.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9d8df9d elementor-widget elementor-widget-heading\" data-id=\"9d8df9d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3.1  The Fatal Operational Error<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-11bdda4 elementor-widget elementor-widget-text-editor\" data-id=\"11bdda4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Inexperienced workers, desperate to meet production quotas, often try to melt the frozen barrels by roasting them with open flames or wrapping them in heavy-duty heating blankets pushing temperatures past 100\u00b0C.\u00a0<strong>This is a multi-thousand-dollar mistake.<\/strong>\u00a0When MDI is exposed to temperatures exceeding 80\u00b0C, it triggers a violent dimerization reaction. The chemical permanently alters its structure, turning into irreversible, useless solid chunks.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f89142 elementor-widget elementor-widget-heading\" data-id=\"8f89142\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3.2 Haifeng\u2019s Standard Operating Procedure (SOP) &amp; Engineering Solution:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aa292ec elementor-widget elementor-widget-text-editor\" data-id=\"aa292ec\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol><li><strong>Static Melting:<\/strong>\u00a0If a full barrel of Component B has crystallized, the only standard procedure is to move it into a\u00a0<strong>constant-temperature drying room or a dedicated raw material oven<\/strong>, setting the temperature strictly within the safe zone of\u00a0<strong>50\u00b0C to 70\u00b0C<\/strong>. This slow, safe melting process usually takes 10 to 15 hours, meaning factory managers must plan their raw material capacity well in advance.<\/li><li><strong>Machine-Level Constant Temperature Control:<\/strong>\u00a0To permanently eliminate this hidden danger on the production floor, Haifeng\u2019s PU casting machines are equipped with an\u00a0<strong>Intelligent Jacketed Heating Tank System<\/strong>. Once the raw material enters our machine, the system uses a heated water\/oil jacket to automatically lock the temperature of Component B in its optimal, highly active state of\u00a0<strong>35\u00b0C to 45\u00b0C<\/strong>, thoroughly eradicating any risk of crystallization during live production.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2d72a9b elementor-widget elementor-widget-heading\" data-id=\"2d72a9b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">4. Fatal Workshop Pain Point 2: Why Does the A\/B Ratio Always \"Drift\"?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d196acb elementor-widget elementor-widget-text-editor\" data-id=\"d196acb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A frequent complaint we hear from factory owners during month-end inventory checks is:\u00a0<em>&#8220;I purchased the exact required ratio of A and B materials, so why is there always leftover A-material after production?&#8221;<\/em><\/p><p>This occurs because, during live production, machine operators will unconsciously and artificially\u00a0<strong>increase the dispensing ratio of Component B (MDI)<\/strong>. The reason is grounded in workshop survival: The NCO groups in Component B are highly reactive and will instantly degrade if exposed to moisture in the air. If a barrel of Component B has been open for too long, or if the workshop humidity is excessively high, the material loses its potency, resulting in shoe soles that are soft, sticky, or un-cured. To ensure the soles cure fast enough to be demolded on schedule, operators are forced to manually increase the output volume of Component B to forcefully balance the NCO\/OH reaction stoichiometry.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f6ac90 elementor-widget elementor-widget-heading\" data-id=\"8f6ac90\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">4.1 How do you solve this?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3a8223b elementor-widget elementor-widget-text-editor\" data-id=\"3a8223b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Aside from strictly controlling workshop humidity and material inventory cycles, you must invest in a casting machine equipped with high-precision servo motors and advanced metering gear pumps. By utilizing Haifeng&#8217;s mechanical precision, you lock the A\/B ratio drift rate to below 0.5%. This physically revokes the operator&#8217;s ability to arbitrarily &#8220;turn up the B-material dial,&#8221; saving you massive amounts of wasted chemicals over the fiscal year.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4175f02 elementor-widget elementor-widget-heading\" data-id=\"4175f02\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">5. Adding Component C (Catalyst): The Commercial Battle Between Manual Intervention and Standardized SOPs<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0e36074 elementor-widget elementor-widget-text-editor\" data-id=\"0e36074\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Regarding how Component C is added to the mix, there are two distinctly different philosophies within the footwear industry, representing a clash of commercial logic.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-43a66f9 elementor-widget elementor-widget-heading\" data-id=\"43a66f9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">5.1 The Traditionalists: Manual On-Site Addition (Prioritizing Flexibility)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c72e93e elementor-widget elementor-widget-text-editor\" data-id=\"c72e93e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The brutal reality is that the vast majority of ordinary shoe factories still rely on methods from a decade ago: The workshop foreman manually measures the catalyst (and color pigments) using a beaker and manually stirs it into the Component A tank, adjusting the dose based on that morning&#8217;s temperature and humidity.<\/p><ul><li><strong>The Justification:<\/strong>\u00a0This grants the foreman immense flexibility. By tweaking the catalyst and blowing agents, they can\u00a0<strong>real-time adjust the density, hardness, and individual weight of the shoe sole<\/strong>. If the factory wants to save a few cents on material by making the sole lighter today, the foreman can achieve it with a splash of chemicals.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1dfac9d elementor-widget elementor-widget-heading\" data-id=\"1dfac9d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">5.2 The Modernists: Using Pre-Mixed Formulated Polyol (Prioritizing Absolute Stability)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-96d591f elementor-widget elementor-widget-text-editor\" data-id=\"96d591f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>However, in the high-end benchmark factories serviced by Haifeng, this logic is completely overturned.<\/p><ul><li><strong>The Commercial Truth:<\/strong>\u00a0If you are manufacturing for international Tier-1 brands (like Nike or Adidas), you are bound by draconian Standard Operating Procedures (SOPs). In this realm, &#8220;human intervention&#8221; is considered the highest risk factor. Therefore, purchasing a\u00a0<strong>&#8220;Fully Formulated Polyol&#8221;<\/strong>\u00a0(where the catalyst is already perfectly pre-mixed by multinational chemical giants like BASF or Huntsman) is the ultimate operational model. It is 100% stable and immune to operator moods or shifting weather. Haifeng\u2019s automated equipment is perfectly synchronized with these pre-mixed systems, ensuring that out of 10,000 pairs of shoe soles produced, the physical properties of pair #1 are identical to pair #10,000.<\/li><\/ul><p><em>(Note: If your factory requires rapid color changes or catalyst adjustments without stopping the machine, Haifeng also offers advanced 3-component\/multi-component casting machines where Component C is injected independently at the mixing head).<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8ecee72 elementor-widget elementor-widget-heading\" data-id=\"8ecee72\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">6. The Bloody Battle Between ESG and Profit: The Truth About Release Agents, Solvents, and Blowing Agents<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f767bb1 elementor-widget elementor-widget-text-editor\" data-id=\"f767bb1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>As an equipment manufacturer, we could write a polished, sanitized brochure. But as a Chief Engineer with 30 years on the workshop floor, I must present factory owners with the cruel realities of the industry.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f04f2f4 elementor-widget elementor-widget-heading\" data-id=\"f04f2f4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">6.1 Highly Toxic Solvents vs. Water-Based Eco-Friendly Solutions<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dc9a371 elementor-widget elementor-widget-text-editor\" data-id=\"dc9a371\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Mold release agents are sprayed onto the molds to ensure the cured PU sole detaches easily. Cleaning agents (mold washing agents and mixing-head solvents) are used to dissolve cured polyurethane &#8220;dead material&#8221; stuck in the machinery.<\/p><ul><li><strong>The Reality of the Low-End Market:<\/strong>\u00a0Currently, the vast majority of low-margin factories still use\u00a0<strong>Methylene Chloride (MC)<\/strong>\u00a0and\u00a0<strong>Dimethylformamide (DMF)<\/strong>\u00a0as the primary ingredients for their release and cleaning agents. The reason is simple: they evaporate instantly, their cleaning power is unmatched, and they represent the ultimate pursuit of cost-efficiency.<\/li><li><strong>The ESG Transformation in High-End Factories:<\/strong>\u00a0Methylene Chloride and DMF are highly toxic, highly volatile, and carcinogenic. They pose severe health risks to workers and the atmosphere. With the aggressive global deepening of ESG (Environmental, Social, and Governance) principles, these chemicals are strictly banned in European and North American supply chains.<\/li><li><strong>Haifeng\u2019s Water-Based Solution:<\/strong>\u00a0For high-end footwear factories (especially those in the Nike\/Adidas supply chain), Haifeng developed a\u00a0<strong>&#8220;Water-Based Release Agent &amp; Eco-Friendly Water-Washing Machine System&#8221;<\/strong>\u00a0over a decade ago.<\/li><li><strong>The Cruel Cost of &#8220;Green Premium&#8221;:<\/strong>\u00a0Factory owners must understand basic physics: Water evaporates much slower than highly volatile toxic solvents. Adopting a water-based eco-friendly solution means you must raise your mold heating temperatures and extend the drying tunnel time.\u00a0<strong>Compared to traditional toxic solvents, this inevitably slows down your daily assembly line output and increases the manufacturing cost (OPEX) of every single shoe sole.<\/strong>\u00a0This is the unavoidable &#8220;Green Premium&#8221; a factory must pay to secure lucrative contracts from international flagship brands.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d4f6832 elementor-widget elementor-widget-heading\" data-id=\"d4f6832\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">6.2 The Generational Shift in Blowing Agents: The End of 141B<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0133742 elementor-widget elementor-widget-text-editor\" data-id=\"0133742\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Blowing agents are used to create the microcellular structure and lower the density of the shoe sole. Historically, HCFC-141b (141B) dominated the market due to its excellent foaming performance and rock-bottom price. However, it causes irreversible depletion of the Earth&#8217;s ozone layer.<\/p><ul><li><strong>The Industry Red Line:<\/strong>\u00a0As of\u00a0<strong>January 1, 2026<\/strong>, China has completely banned the use of 141B. All domestic footwear chemical formulations have been forcibly transitioned to\u00a0<strong>All-Water Blown Systems<\/strong>\u00a0or fourth-generation eco-friendly blowing agents (HFOs).<\/li><li><strong>A Warning for Overseas Factory Builders:<\/strong>\u00a0Although environmental regulations may take longer to enforce in certain developing nations, the global phase-out under the Montreal Protocol is irreversible. When procuring equipment today, you must explicitly demand that the supplier&#8217;s machinery is engineered to handle &#8220;all-water blown systems&#8221; (which have higher viscosities and more aggressive reaction profiles). Otherwise, your brand-new factory will be technologically obsolete within two to three years.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6721e39 elementor-widget elementor-widget-heading\" data-id=\"6721e39\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3016083 elementor-widget elementor-widget-text-editor\" data-id=\"3016083\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Managing a polyurethane shoe sole workshop is essentially waging a daily war of chemical reactions and physical controls. You only earn your ticket into the high-end footwear manufacturing arena once you understand the strict melting rules for crystallized B-material, grasp the commercial trade-offs between manual dosing and pre-mixed polyols, and proactively calculate the financial costs of the incoming water-based and all-water blown ESG era.<\/p><p>In the next installment,\u00a0<strong>[Part 2: Practical Processing]<\/strong>, I will teach you how to use the most primitive yet effective method on the floor\u2014the &#8220;Cup Test&#8221;\u2014to precisely calculate the material volume for every single shoe sole, and we will brutally dissect the life-or-death differences between PU casting and TPR\/PVC injection molding. Stay tuned.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e55cd54 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"e55cd54\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c0794e4 elementor-widget elementor-widget-text-editor\" data-id=\"c0794e4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>[If you are encountering challenges with eco-friendly formulation compatibility or temperature-control system selection while building your PU footwear factory, contact the Haifeng Engineering Team immediately. We will provide you with realistic capacity calculations and customized equipment solutions.]<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5909d77 elementor-widget elementor-widget-heading\" data-id=\"5909d77\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The Ultimate EPC+M+O Guide to PU Shoe Sole Manufacturing:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0c10650 elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"0c10650\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/haifengmachine.com\/pu-shoe-sole-formulation-raw-materials-guide\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-check\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"> [Part 1: Materials &amp; Chemistry]<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/haifengmachine.com\/pu-shoe-sole-manufacturing-cup-test-foaming\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-check\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">[Part 2: Practical Processing]<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/haifengmachine.com\/pu-shoe-sole-defects-release-agents-troubleshooting\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-check\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"> [Part 3: Workshop Chemicals]<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/haifengmachine.com\/pu-casting-machine-mechanics-pumps-pressure\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-check\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"> [Part 4: Mechanics &amp; Fluid Dynamics]<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/haifengmachine.com\/pu-shoe-factory-layout-automation-turnkey-lines\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-check\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"> [Part 5: Factory Layout]<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e1c91ab elementor-widget elementor-widget-heading\" data-id=\"e1c91ab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-668c1df elementor-widget elementor-widget-n-accordion\" data-id=\"668c1df\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;expanded&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1070\" class=\"e-n-accordion-item\" open>\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"true\" aria-controls=\"e-n-accordion-item-1070\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What is the general shelf life of Component A and Component B raw materials? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1070\" class=\"elementor-element elementor-element-666d3f5 e-con-full e-flex e-con e-child\" data-id=\"666d3f5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1070\" class=\"elementor-element elementor-element-3fa5bf3 e-flex e-con-boxed e-con e-child\" data-id=\"3fa5bf3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9250858 elementor-widget elementor-widget-text-editor\" data-id=\"9250858\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Unopened Component A (Polyol) is relatively stable and typically has a shelf life of 6 to 12 months. Component B (MDI Prepolymer), however, is highly reactive and normally expires within 3 to 6 months unopened. Once a barrel of Component B is opened, it begins to rapidly absorb ambient moisture and can degrade or form a hardened crust within just 1 to 2 weeks. Therefore, factory owners should schedule raw material procurement monthly based on actual production capacity, rather than hoarding half a year&#8217;s supply just to secure bulk discounts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1071\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1071\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What are the strict precautions for storing these chemical liquids in the factory warehouse? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1071\" class=\"elementor-element elementor-element-745eb0d e-con-full e-flex e-con e-child\" data-id=\"745eb0d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1071\" class=\"elementor-element elementor-element-7efe4bb e-flex e-con-boxed e-con e-child\" data-id=\"7efe4bb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f721321 elementor-widget elementor-widget-text-editor\" data-id=\"f721321\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Proper storage relies on three non-negotiable rules: Temperature, Moisture Control, and Nitrogen Purging.<\/p><ul><li><strong>Temperature:<\/strong> Both components must be stored indoors strictly between 20\u00b0C and 30\u00b0C. Never expose Component B to direct sunlight (which accelerates toxic deterioration) or allow the warehouse to drop below 20\u00b0C (which triggers crystallization).<\/li><li><strong>Moisture Control:<\/strong> Barrels must be elevated on wooden or plastic pallets; never let them touch the cold, damp concrete floor directly.<\/li><li><strong>Nitrogen Purging:\u00a0<\/strong>If a barrel of Component B is partially used, you must purge the empty headspace inside the barrel with dry Nitrogen gas before sealing it tightly. This isolates the chemical from atmospheric moisture and prevents fatal curing inside the drum.<br \/><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1072\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1072\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\">  Can I mix different brands of PU raw materials in the same Haifeng casting\/pouring machine? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1072\" class=\"elementor-element elementor-element-cb93ca7 e-con-full e-flex e-con e-child\" data-id=\"cb93ca7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1072\" class=\"elementor-element elementor-element-8d3d3b7 e-flex e-con-boxed e-con e-child\" data-id=\"8d3d3b7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7fe6436 elementor-widget elementor-widget-text-editor\" data-id=\"7fe6436\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Mechanically, Haifeng&#8217;s PU casting machines are universally compatible and can pump any brand of PU chemicals. However, chemically, it is absolutely forbidden to mix &#8220;Brand X&#8217;s Component A&#8221; with &#8220;Brand Y&#8217;s Component B.&#8221; Different chemical manufacturers use proprietary formulations and specific catalysts. Mixing cross-brands will cause severe chemical repulsion, leading to collapsed foam, brittle soles, and massive production failures.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1073\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1073\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Will switching to an eco-friendly water-based release agent cause my expensive CNC metal molds to rust? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1073\" class=\"elementor-element elementor-element-ef1b472 e-flex e-con-boxed e-con e-child\" data-id=\"ef1b472\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ac565ce elementor-widget elementor-widget-text-editor\" data-id=\"ac565ce\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>This is a common concern when transitioning to ESG standards, but it is highly preventable. Modern premium water-based release agents are formulated with specialized anti-rust additives. Furthermore, by maintaining the molds at their optimal working temperature (which evaporates the water rapidly) and utilizing a sandblasting machine for regular maintenance and surface conditioning, rust is completely mitigated.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1074\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"5\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1074\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> How do I know if my Component B has been contaminated by moisture during storage? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1074\" class=\"elementor-element elementor-element-a7fdeb4 e-flex e-con-boxed e-con e-child\" data-id=\"a7fdeb4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f553992 elementor-widget elementor-widget-text-editor\" data-id=\"f553992\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The most obvious visual indicator is the presence of a thick, crystallized &#8220;skin&#8221; or crust on the surface of the liquid inside the barrel. Additionally, if you notice the liquid becoming unusually cloudy, or if pressure starts building up inside the sealed drum (caused by the MDI reacting with water to produce carbon dioxide gas), the material has been compromised. Pouring moisture-contaminated B-material will result in shoe soles covered in microscopic blisters and a severe drop in tensile strength.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-df86dbd elementor-widget elementor-widget-html\" data-id=\"df86dbd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Why did my Component B (MDI) suddenly turn into solid white chunks overnight?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"This is MDI crystallization, caused by exposing the chemical to temperatures below 15\u00b0C (59\u00b0F). It must be stored strictly between 20\u00b0C and 25\u00b0C. To fix this, you must slowly bake the entire drum in a forced-air oven at 50-70\u00b0C for several hours until the white chunks melt completely.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can I permanently swap out 141B with distilled water to save money and pass environmental audits?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. While water is eco-friendly and acts as a blowing agent, it fundamentally changes the PU structure, making the sole dense, brittle, and prone to severe shrinkage. You cannot simply swap them 1-to-1. You must use a completely reformulated 'Water-Blown Polyol System' provided by your chemical supplier.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"How often should I stir the Polyol (Component A) tank?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Polyol is a blend of resins, catalysts, and additives that naturally separate over time. It should be continuously agitated at a low speed (usually 20-30 RPM) while the machine is running, and heavily stirred for 30 minutes before starting production each morning.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Why is the PU mixture turning yellow after it cures?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"This is a natural chemical degradation called UV oxidation, inherent to aromatic polyurethanes (like MDI). To prevent this, you must ask your chemical supplier to add an 'Anti-UV additive' into the formulation, or paint the soles with a UV-resistant coating post-production.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What happens if I accidentally mix a few drops of water into the Component B tank?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Catastrophe. MDI reacts violently with water to produce insoluble polyurea solids and massive amounts of carbon dioxide gas. This will rapidly pressurize the drum (potentially bursting it) and form hard crystals that will permanently destroy your metering pumps.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e74f193 e-flex e-con-boxed e-con e-parent\" data-id=\"e74f193\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fee5b2e elementor-widget elementor-widget-author-box\" data-id=\"fee5b2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"author-box.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-author-box\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.linkedin.com\/in\/jiacheng-dai-haifeng-automation\/%20EEAT\u80cc\u4e66\" class=\"elementor-author-box__avatar\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/haifengmachine.com\/wp-content\/uploads\/2026\/04\/6f52b74a24f1daff3840682463cc195c-300x300.png\" alt=\"Picture of Jiacheng Dai\" loading=\"lazy\" title=\"\">\n\t\t\t\t<\/a>\n\t\t\t\n\t\t\t<div class=\"elementor-author-box__text\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.linkedin.com\/in\/jiacheng-dai-haifeng-automation\/%20EEAT\u80cc\u4e66\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t\t<span class=\"elementor-author-box__name\">\n\t\t\t\t\t\t\tJiacheng Dai\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-author-box__bio\">\n\t\t\t\t\t\t<p>Vice President, Sales & Marketing of Zhejiang Haifeng Automation Equipment Co., Ltd<br \/>\n- Member of the Polyurethane Equipment Professional Committee, China Polyurethane Industry Association<br \/>\n- Member of the Expert Committee on Footwear and Apparel Equipment, China Leather Association<br \/>\n- Executive Vice President, Wenzhou Footwear Machinery Chamber of Commerce, China<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Why is producing polyurethane (PU) shoe soles considered the ultimate test of PU casting technology? Because microcellular elastomers demand exceptionally strict chemical control over A\/B material ratios, mold temperatures, and demolding times. In this guide, Haifeng Polyurethane Machinery&#8217;s Chief Engineer reveals the unvarnished realities of the workshop floor. From the correct 50-70\u00b0C melting process for crystallized B-material (MDI) to the commercial trade-offs between manual Catalyst (C-material) addition and pre-mixed fully formulated polyols. We also dissect the brutal cost battle between low-end toxic solvents (Methylene Chloride\/DMF) and Haifeng&#8217;s high-end water-based release agents used in top-tier supply chains. Whether you are navigating the global phase-out of 141B blowing agents or fixing daily A\/B ratio drift, this guide provides the hardcore engineering data you need for highly profitable footwear production.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"table_tags":[],"class_list":["post-5983","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/posts\/5983","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/comments?post=5983"}],"version-history":[{"count":12,"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/posts\/5983\/revisions"}],"predecessor-version":[{"id":6190,"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/posts\/5983\/revisions\/6190"}],"wp:attachment":[{"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/media?parent=5983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/categories?post=5983"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/tags?post=5983"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/haifengmachine.com\/ru\/wp-json\/wp\/v2\/table_tags?post=5983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}