Why Their Mining Fleets Are Moving Away from Pneumatic Tires in 2026

Across the face of open-pit mines, quarries, slaggings, demolition sites, steel plants, and underground haulage up to a quarter of the loaded operations can involve tire failure that has become one of the highest hidden costs of in-use downtime for heavy equipment. It’s not desirable of the tire casing itself, most modern OTR tire use is adequately strong for mining use and the operational losses begin after repeated punctures, heat cycling, sidewall collapse, unstable retention of pressure, and deferral of field repair.

That turning point is why foam-filled tire systems are replacing traditional air-filled tire management types in small wheel loader, telehandler, underground miiining vehicle, skidsteer, articulated dump truck, blast hole drill, and port handling uses as well.

Advantage accruing here is more than “flap-proof tires”. The true advantage is in operational continuity in uncontrolled terrain. Where air pressure is impossible to stabilize consistently in a balance that secures rolling performance.

For a mining fleet with 18-24 hr daily use accumulation of a single tire failure can stop an entire sequence of loading, disrupt haul up schedule and rim-damage, wheel motor overload, and pose secondary down time far beyond that entailed in the tire itself.

In 2026 mining companies are better informed about judging a tire filling system on the basis of:

• Thermal stability with long duty cycles
• Foam density homogeneity
• Heat generation inside large OTR voids
• Weight balancing for curing
• Pump accuracy with dual-component injection
• Field serviceability
• Explosion-proof filling safety
• Remote diagnostic capability
• Casing long-term survivability after fill.

This is when specialized systems like the OTR Tire Foam Filling Machine, Foam Filled Tire Equipment, Polyurethane Tire Flat Proofing Pump System become operational infrastructure and not just optional workshop equipment.

Manufacturers like BASF have also hastened the pace of development of very low heat reactive polyurethane systems for industrial tire users because mining operators are asking for longer life with less thermal degradation during continuous loading cycles.

At the equipment level suppliers like Haifeng Automation, Haifeng PU Technology, and Haifeng Engineering are exporting integrated foam filling stations with automatic metering, pressure-monitoring, explosion-proof control architecture and remote diagnostic systems to mining contractors all over the world.

Word from the Wise: the Biggest Benefit of Foam Filling is Not Tire Protection

New operators imagine foam filling is all about preventing punctures from rocks or scrap metal.

Pioneering or even just bombproof mining managers usually leave it up to the finance director to calculate things differently.

The greatest cost savings are likely to flow from the elimination of service interruptions in remote regions when tire changing procedures become so cumbersome.

A loader tire puncture in an urban warehouse job may cost two hours.

The same failure underground in a copper mine can halt production equipment for an entire shift if:

• Vehicles to replace tires must travel a considerable distance
• No spare OTR inventory is maintained nearby
• It may be impossible to reach the cata-rophically damaged tire with a crane
• In general the pace of maintenance of underground equipment is slow. Miners must work in an environment hot in the blast furnace and closely confined to boot

Even one flat tire at a mine where two (or more) wheel loaders are operating every day can create serious traffic flow prob-lems in the movement of material from one point to another.

Operators would not be such enthusiastic foam filling proponents today if they did not carefully mesh the cost of foam filling against continuity of production in addition to the comparatively low price of tires.

How Foam Filled Tires Actually Work

Foam filling systems inject a two-component polyurethane elastomer into the annular space of the tire at controlled pressure.

Squeezed between the tire casing and the void, the rigid microcellular material which results retains the basic 11000hrm of the tire internally, though not relying on compressed air for support. Unlike solid rubber tires, foam filled tires still retain some characteristics in deformation; the kiss of a flat may still be absorbed though the sudden collapse which solid rubber would experience on the tag end of a puncture 11000hrm is avoided.

Modern Filling System Features

• High pressure metering pumps
• Heated material circulation
• Being able to calibrate density levels
• Static or dynamic mixing heads
• Activating a pressure stabilization period
• Having explosion proof electrical drives
• Automatically sensing filling ratio
• Vacuum-assisted cavity filling for the even larger OTR tires

The actual filling of the cavity must depend greatly on all of the above; foam density, elimination of voids where possible; keeping mixing uniform; heat generated in the reaction must dissipate internally; plus, complete saturation of interstices within the tire casing must be achieved.

Poor control in any of the above areas may create voids inside the foam which are collapsed under compression at some later time. Besides the greater upfront capital outlay, this is but one reason many foam filling operations of the low price bargain type go out of business prematurely.

The Counterintuitive Problem: Harder Foam Is Not Always Better

Many novice customers want the maximum foam density because they believe harder foam means longer wear.

In actual quarry operations, overzealous hard foaming can reduce tire life.

A very hard fill will transmit more of the impact energy directly to the:

• Tire sidewalls
• Bead regions
• Wheel hubs
• Suspension components
• Axle assemblies

Over successive haul cycles, this can predispose casing fatigue and lead to sidewall separation.

Most foam filling specialists try to achieve a compromise state in all four characteristics; load support, impact absorption, heat control and flex retention.

For large wheel loaders travelling on rough surfaces in a quarry, a moderate density fill will quite often give longer casing life than an ultra-hard fill.

This can be more important in an articulated vehicle where sidewall flexing cannot be avoided when cornering.

Heat Generation Is the Problem in Large OTR Foam Filled Tires

In mining tires larger than a 25 inch rim, the management of heat generation becomes more important than the prevention of punctures.

During continued rolling heat is built up from:

1. The deformation of the tire.
2. The compression of the polyurethane foam.
3. Frictional hysteresis.
4. Heavily-loaded cycles.
5. Fast-speed haul routes.

If the foam chemistry generates excessive exotherm heat during curing or retains too much heat in its mass during use, the tire casing can deteriorate from the inside even though the outer surface appears normal.

That is why modern High Capacity OTR Tire Foam Filling Stations are beginning to incorporate such things as:

• Temperature compensated metering of polyurethane
• Controlled speed of chemical reaction in-tire
• Multi-stage filling procedures
• Thermal monitoring/feedback protocols
• Density “stabilization” algorithms

In very hot areas of the world, where air temperatures exceed 40° C, the wrong foam chemistry used in overfilling a tire can severely compromise tire life.

Operators from Australia to Chile, the Middle East and Africa’s copper belts are beginning to favour low heat polyurethane type compounds instead of maximum hardness.

When Foam Filled Tires Work Extremely Well

Surface Mining Wheel Loaders

“Challenging” as in rock cuttings, crushed and/or jagged rocks, scrap and/or rebar and/or blasting rubble the wheels may have to ride over. Operational downtimes are cut tremendously.

Typical gains up to:

• 70-95% less time was lost getting to the repair shop after a breakdown.
• 30-50% less time spent on emergency tire service calls.

Underground Mining Vehicles

Pneumatic tire failures are very inconvenient and highly dangerous in confined underground mining situations.

Filling greatly improves:

• Interruption of tunnels while repairs are made.
• Reliance on mobile service.
• Spare stockpiling of tires underground.

Port and Steel Plant Equipment

Steel slag, rebar scrap, metallic rubbish do in more pneumatic tires than you can shake a stick at.

Foam filled, it’s “go” even though the tires are punctured.

Demolition and Reclamation Yards

High frequency of punctures often means foam filling pays for itself in a couple of months (in reduced non-operation time).

When Foam Filled Tires are Not So Good

Foam filling is not everything and there are operational needs where tire performance is better with an inflated tire form.

High Speed Long Distance Haul Trucks

Speeds attained in excess of 30 mph do lead to heat build up inside foam filled tires.

Large mining type haul trucks run and what they put in, they expect to haul away, i.e., at great travelling speeds. Getting rid of that heat is going to be a problem.

Accuracy Ride

In a high precision ride:

• Transferring more vehicle vibration back to the operator.
• Ride not being as cushy.
• Greater fatigue on the operator over long distance travel.

Weight Averse Wheel Equipment

Foam filling will add substantially to tire weight.

Where this extra weight makes a difference:

• Fuel efficiency
• Drivetrain strain
• EV use

Significantly Damaged Tyres

Foam exists to help with worn casings, not damaged structures.

Some operators report that the complications on-site mean foam can only delay a total failure.

They check for:

• Sidewall fatigue
• Bead splitting
• Casing separation
• Cord damage

And only then suggest foam filling.

Why are Modern Mining Fleets Geared Towards Automating Filling Foam?

Old-style foam filling shops tended to rely on the solvent seen as an extension of the operator. The challenge, then, became consistent results.

Two people using the same foam leading to totally different restoration looks and use?

Modern automation isn’t brilliant for honing a single filling pump for most people, here modern systems are using:

• Digital ratio control
• Servo metering
• Automatic fill pressure control
• Flow stabilization
• Computerized monitoring
• Remote troubleshooting

This is especially true for export projects where mining firms demand standardized use across multiple sites.

What Does a New Explosion-proof Tire Filling Machine Solution Look Like?

Modern System Controls

That’s why people ask for nowadays:

• PU Machine Remote Troubleshooting
• PU Equipment Operator Training
• PU Mixing Head Maintenance/Repair
• PU Machines Fix

Top wizards try not to think about it. It’s depressing enough.

What Mining Buyers Must Consider When Investing In Foam Filling Equipment

1. Maximum Tire Size Accommodation

Many low budget systems struggle with very large OTR voids.

Check for:

• Max tire diameter.
• Cavity volume supported.
• Pump flow volume.etc.

2. Mixing Head Reliability

Poor mixing causes:

• Soft spots.
• Internal collapse.
• Solid density vairy and pre-empty case failure.

Usually has the highest upkeep of any part in the whole system!

3. Explosion-Proof Protection Design

Polyurethanes involve reactive chemicals and heat.

Industrial mining sites need certified protection systems.

4. Remote Service Support

Mine sites often lack accessible technicians getting stuck out on site for days over an electric fault that can be readily diagnosed with a remote monitoring capability.

5. Operator Training Depth

A very technically adept machine will still fail on the operating site if the filling procedure isn’t controlled carefully.

Libraries of filling parameters and the like are available as well as density calibration training etc.

The Industry Direction in 2026

Lower Heat Reactive Systems

Coupling several new composition polyurethanes together allows greater emphasis on enhancing long term compressive strength while avoiding internal irreversible thermal build up during continual heavy duty operation.

Smart Monitoring Integration

Some new building systems also provide for filling pressure logging and consumption of material analytics alongside predictive alerts and even cloud based diagnostic systems.

Energy Efficient Hydraulic Control

Filling stations are beginning to feature energy efficient servo-driven pump architectures reducing the overall energy requirements when utilizing high product fill cycles.

Modular Exportable Filling Stations

Mining contractors operating across several countries have begun utilizing containerized foam filling systems allowing easier deployment.

Bio-Based Polyurethane Research

Material suppliers are beginning to trial partially bio based polyols in PU fill materials attempting to offset the environmental impact without sacrificing the structural suitability of the material.

Choosing The Correct Partner Is More Important Than Machine Price

Almost invariably mining operators find they are better off looking to the chemistry of the polyurethanes and filling systems, thermal control aspects, remote service support and long term operational stability for their project success rather than equipment price.

A low price filling machine with uncontrollable ratio would make more casing holes than running on pneumatic even!

That why larger industrial buyers prefer integrated suppliers who can guarantee delivery of:

• Complete system polyurethane processing
• Filling chemistry support
• Operator training
• Spare part supply
• Remote troubleshoot
• Mixing head maintenance
• Long term optimization of their process
• Plant layout engineering

For international buyers sourcing from China, integrated suppliers such as Haifeng Automation or related polyurethane engineering groups are increasingly positioning themselves as providers of complete polyurethane manufacturing infrastructure rather than equipment imitators, that is to say they want to provide to the final user:

• PU Production Project
• Complete PU Plant Equip
• One stop PU Solution
• Integrated polyurethane machinery system for export
• Customized PU machinery turnkey project solution
• One-stop PU equipment Solution Provider
• Starting point complete polyurethane manufacturing system

That mirrors other transitions across the industry such as:

• Fully automatic PU equipment
• Turnkey project polyurethane
• 5.0.0.2
• PU Product
• Complete polyurethane 8.00
• Complete PU parts fault detection system

from individual buyer to individual part often wholesale buyers have now accepted a smaller profit around enabling sustained operation continuity, renewable support capability and long term process stability over isolated equipment purchases.

FAQ

What is the greatest benefit of foam filled tires for mining equipment?

The major benefit is reducing operational downtime. In most mining applications, tire punctures cause further losses in production that can cost much more than the tire. Foam filled tires allow a piece of equipment to continue working even with penetration damage caused by sharp rocks, scrap steel, blasting residue, or demolition debris.

How long will a foam filled tire last, compared to an air filled version?

Service life is governed by:

• Tire carcass quality
• Foam density
• Heat generation
• Load conditions
• Hauls
• Driving behavior of the operator

In moderate duty quarry applications, a properly filled tire may last almost as long as the remaining structural life of the original casing. In extreme temperature mining environments where travel speeds are excessive, casing fatigue due to heat generation may occur sooner.

Will foam filled tires cure a mine’s puncture problems?

They’ll eliminate operational air-loss failures, but external damage may still occur in the tire. Cuts, side wall tearing, bead separation, structural casing damage are still potentially both risks in severe mining duty.

The difference is that ahead of penetration, the tire is generally still operating rather than sitting down.

Are foam filled tires heavier than an equivalent pneumatic?

Yes.

Foam filling considerably increases the weight of a tire, as the internal air pocket is now filled with a polyurethane elastomer. This additional weight improves stability in some applications, but may also increase:

• Fuel use
• Load on the drive train
• Bearing stress
• Load on hydraulics

Weight becomes most crucial for electric mines and high-speed transport.

Why do some foam filled tires fail prematurely?

Most wear-out issues are caused by process quality, not necessarily urethane quality.

• Improper mixing ratio — especially for large sections.
• Internal gas voids during fill.
• Inadequate cure temperature.
• High foam density.
• Tire tire casing damage.
• Incomplete cavity saturation.
• Mixing head.

That’s why knowledgeable operators put so much into dip calibrations and operators’ training!

Can any mining tire be foam filled?

No.

Foam filling is not practical for:

• Very high-speed haultrucks
• Long haul.
• Light weight high-speed vehicles.
• Damaged tires.
• Where maximum comfort from driving is required.

The tire casing should be carefully visually examined to detect:

• Cord separation.
• Sidewall cracks.
• Staggers around the bead.
• Internal fatigue.

What density foam should I use on my mining tires?

There is no universal density applicable for all equipment.

Heavier foam is not necessarily a better fill. Rigid urethane inserts actually tend to stress the casing and hasten sidewall fall-out wear.

The proper density is determined by knowledge of:

• Weight of the unit.
• Operating speed.
• Surface roughness.
• Ambient temperature
• Shock load frequency.
• The size of the tire.

Polyurethane projectionists usually work around balancing firmness and heat production.

How critical is heat to me in foam filling?

One of the most important technical factors in filling large OTR type tires lies in heat production in the process.

During the polyurethane reaction, excess exothermic heat is generated that can cause damage to the tire casing. Again, during service, continued compression heat is produced in the foam.

Slightly different requirements exist in this area for mining tire foam filling and the questions below elicit the requirements of the bulk of purchasers of such equipment in 2026.

What does modern tire foam filling equipment include?

Modern foam filled tire equipment therefore usually contains:

• Temperature-controlled circulation
• Multi-stage filling
• Pressure stabilization
• Low-heat polyurethane chemistry
• Automated metering systems

What equipment is required for foam filling mining tires?

A modern professional mining tire filling setup will usually include:

• OTR Tire Foam Filling Machine
• High-pressure metering pump
• Polyurethane mixing system control cabinet
• Explosion-proof control cabinet
• Material heating system
• Vacuum-assisted filling system
• Polyurethane, tire flat proofing pump system
• Density calibration tools

Many large mining projects install complete ‘station’ type foam-filling stations for industrial continuous production.

Why are automated foam filling equipment becoming common in 2026?

Mining companies linked to multiple site operations tend to want as high a quality of fill as possible in each area.

Automated systems also tend to reduce operator experience dependence to a large extent, the fill quality of material controlled by:

• Material ratio
• Filling pressure
• FLow rate
• Temperature stability
• Injection consistency

Advanced systems also allow:

• Remote diagnostics
• Logging production data
• Predictive maintenance
• Coud-in-cloud monitoring/troubleshooting

This is especially important when mining contractors take their fleet of equipment across several countries.

Can I upgrade an existing foam filling equipment system instead of replacing it?

Yes.

A huge number of mining tire workshops now choose to go about:

• Retrofitting old PU machines
• Upgrade to a decent PLC,
• Replace old mixing heads with a more modern design
• A decent servo-driven high-quality metering pump
• Remote troubleshooting capability

This retrofitting is often all that is needed and drastically improves the consistency of fill.

What do I look for when selecting a foam filled tire equipment supplier?

Take into account the following and do some serious comparison shopping:

Many prefer to get aside machines now, selecting a supplier that can offer the complete engineering pack, and not just a machine.