By 2026, the greatest cost driver in mining tire operations is not the price of the tire. It is unplanned downtime.

Across open-pit mines and quarry operations, steel plants, ports, demolition sites, waste recycling yards, underground material handling and surface, maintenance teams are sizing up tires against one simple question:

How many production hours are lost following a puncture?

This is the reason behind the growth in business for OTR Tire Flat Proofing Technology, a method of exchanging compressed air with engineered polyurethan elastomer within heavy-duty tires.

For equipment that must work benath a canopy of sharp rock chips, scrap steel, rebar, blasting debris, and demolition material, flat-proofing is no longer just a choice of maintenance, it is a strategy for continuity of operations.

Full-system tire flat-proofing customers are starting to buy:

• OTR Tire Foam Filling Machine
• Foam Fleed Tire Equipment
• PU Foam Filling Machine for Heavy Duty Tires
• OTR Tire Flat Proofing Liquid Filling Machine
• High Capacity OTR Tire Foam Filling Station
• Explosion-Proof Tire Filling Machine Solution

Manufacturers such as Haifeng Automation, Haifeng PU Technology, and Haifeng Engineering have moved beyond simply selling machines to offering complete turnkey solutions with equipment supply, operator training, remote troubleshooting, process optimization, and layout for the factory itself.

What is OTR Tire Flat Proofing?

OTR (Off-The-Road) tire flat proofing is the process of substituting air inside a tire with a very specific polyurethane elastomer material.

Instead of a pneumatic tire that relies on compressed air pressure to effect support, a foam-filled tire remains stable structurally through the curing of a polyurethan material.

The filling material is delivered into the tire cavity and chemically cured through the controlled dosing of the liquid material.

After curing the tire:

• Cannot go flat
• Maintains load bearing ability
• Carries on operating after puncture
• Alleviates pressure to rush in tire replacements during emergencies

The technology is used for:

Mining Equipment

• Wheel loaders
• Underground mine vehicles
• LHD Machines
• Articulated Dump Trucks

Port Operations

• Reachstackers
• Empty Container Handlers
• Forklifts
• Terminal Tractors

Construction Industry

• Skid steer loaders
• Telehandlers
• Excavator support equipment

Waste Management

• Landfill compactors
• Recycling Yard loaders
• Scrap handling machines

Why Air-Filled Tires Become a Hidden Production Cost

The equipment manager judges success or failure by the life of the tire.

The lifelong mine operator, however, regards downtime as the real enemy.

Picture a big wheel loader operating in an iron ore mine.

A simple puncture of the tire appears to be nothing but an inconvenience in the maintenance department.

What the tire could really cost is:

• Shutdown of equipment
• Idling of man and machine
• Dispatch of maintenance
• Removal of tire
• Potential repair and/or replacement
• Delay in production turnaround
• Disruption of haulage

One piece of equipment could easily be put out of service at a loss many times the price of the tire.

That’s why many mining producers value the tire by:

Cost Per Operating Hour

Not:

Cost Per Tire

Two very different figures of merit for procurement purposes.

How Polyurethane Flat Proofing Works

So you start with a two-component polyurethane.

Component “A”

Polyol Blend

Component “B”

Isocyanate

The components are fed into a metering unit for transport via delivery hoses to a mixing system inside the tire cavity.

The two mix, begin reacting with each other and expanding into a resilient elastomer.

Key process parameters include:

Desired physical properties depend upon:

• Polyol formulation
• Isocyanate index
• Ambient temperature
• Tire size
• Load requirements

The Most Common Mistake in Tire Flat Proofing Projects

In knowledgeable hands, lowering risks beside (materially) a cue tip die is not difficult, but makes complications for new users who believe that greater density equals greater durability.

Actual field experience tends to prove that exactly the opposite may be true, because when imput density foam density is too great tire weight becomes serious, heat accumulates, suspension is stressed too hard, fuel consumption consequently rises, and rim fatigue accelerates.

In fact, for the large mining tire an overfull tire presents greater problems than the danger of the puncture it was intended to avoid.

The experienced engineer will plan most carefully about load-supporting requirements and not worry about maximum foam density.

A properly designd fill density will produce better results than will a purposely made hard, heavy tire.

Performance Data From Generally Mining Applications

These show a tendency toward the following averages in severe mining service.

Operation Pneumatic Tires

Operation in Foam Filled Tires

In a large quarry operation that devotes entire departments to maintenance, these departments have been know to record measurable reductions in still-hung-up time after conversion to foam fill, of all critical equipment.

Where Flat Proofing Should Not Be Used

Not all applications need foam filled tires.

This is something owners of equipment sometimes overlook.

High Speed Highway Vehicles

Foam filled tires run hotter than pneumatic tires so applications involving long hauls on highways are not practical.

Applications Requiring Greatest Comfort of Ride

Air cushions heavily contribute to the shock absorbing capabilities of a machine run on a smooth floor.

Flat proofing does not obviously provide the same degree of advantage.

Equipment with Weight limitations

A rigid tire, although a matter of only a few pounds, will affect:

1. Fuel economy
2. Load capacities
3. Internal structural load-sharing

Proper coordination and engineering ahead of time is advisable.

What happens to OTR tire foam fill technology in 2026?

Here’s the latest by way of some technological developments:

Intelligent Metering/Process Control

Filling machines are now fitting in such items as:

• Digital flow measuring
• Immediate reaction to changes in starting pressure
• Correcting solution/air ratio on the fly

This tends to make for much greater consistency in batches of nearby tires to be filled.

Remote Diagnosis

Filling stations increasingly being used by manufacturers now include:

• Cloud-connected controllers
• Remote troubleshooting capabilities
• Online workflow optimizing

This is a reflection of other needs for information such as:

• PU Machine Remote Troubleshooting
• Polyurethane Equipment Operator Training
• PU Mixing Head Repair & Maintenance

Explosive Filling Systems

to be ok for mines, some really have to be designed for very controlled or special applications.

New generation systems now feature:

• Intrinsically safe control
• Hazardous area approval
• Automated emergency shutdown

Higher Capacity Filling Stations

“When it comes to filling, larger mines expect faster turn around along with a bigger tire fitment, so the flow rates and the capacity of the curing station is critical,” says Al Burke from Fillwheels.

Faster filling has seen Fillwheels itself grow into a three-stage:

One Depot, Regional Tire Service Center, and finally Fleet Operation

1. Small Service Workshop

Production – 5-20 tires/day

Focus on:

• Flexibility
• Low investment

2. Regional Tire Service Center

Production – 20-60 tires/day

Focus on:

• Automation
• Process consistency

3. Mining Fleet Operation

Production – 60+ tires/day

Focus on:

• Continuous production
• High-volume dosing
• Advanced safety controls

Cautionary Guide to Selecting Foam Filling Equipment

You know your needs best, so before you buy, check:

1. Machine Capability

• Maximum diameter rim – diameter it will fill
• Pump output capacity – cubic feet per minute/ liters per minutes.
• Run on: ratio%, accurate within 3%, per barrel.
• Pump safety overload.
• Automation – high/low

2. Process Support

• Training operator – training volunteer
• Start up assistance service
• Spare parts
• Remote technical assistance

3. Engineering Services

• Plan production layout design
• Plan utilities/materials for plant use
• Plan materials storage
• Safety requirements list

4. Long-Term maintenance

• Mixing head service/repair
• Pump rebuilds available
• Control retrofits

The Industry Discovers Why Turnkey Engineering Is the Desirable Approach

Not so long ago most of the plants started with filling machines not as whole systems but as additional machines.

It then turned out that to remain economical, productivity depended on:

• Material handling
• How to store the materials
• Safety procedures
• Operator training and experience
• Site layout/design

That’s why more investors in new plants are edging toward total projects from completely equipped manufacturers like Fillwheels.

OTR Tire Foam Filling Machine, handling and feeding system, Polyurethane processing facilities- its all there in one project rather than a string of individual machines.

Requirements of the project plan deal with:

• Design of all aspects of production layout;
• Design of all new utilities;
• Design and installation of systems to store materials;
• Design of a flow pattern of safety approaches to avoid accidents;

Typical firm to do all this is Fillwheels, Haifeng Automation, Haifeng PU Technology and Haifeng Engineering.

The Future of Flat-Proof Tire Operations

By 2026 we begin talking about production continuity.

Of course tires are important in mines but now, operators specify main production features such as (in order of rank);

• Equipment availability
• Maintenance predictability
• How much an hour costs to operate
• Fleet productivity/tonnage delivery

Thus polyurethane processing becomes fully involved in foam filled tire state of the art systems, helping keep fleets of save in uptimes of millions lost in single truckload value if one tire shows flat.

FAQ

What does OTR Tire Flat Proofing mean?

OTR Tire Flat Proofing refers to the process of replacing compressed air inside an Off-The-Road tire with a specially formulated polyurethane elastomer that, once fully cured, prevents downtime from punctures and allows continued operation even after penetration damage.

What equipment is essential to foam fill OTR tires?

A foam filling system typically contains these elements:

• OTR Tire Foam Filling Machine
• OTR Tire Flat Proofing Liquid Filling Machine
• Impact Resistant Polyurethane Material Feeding System
• Heavy Duty PU Mixing and Metering Unit
• High Capacity OTR Tire Foam Filling Station
• Curing and Material Storage Equipment

Large mining operations will also require explosion-proof filling systems and automated process control environments.

Can a foam filled tire go flat?

No.

After the polyurethane material is cured in a tire cavity, it does not depend on air to retain tire shape. Even if the tire casing is punctured, the machine can go on operating.

What industries make common use of foam filled tires?

• Mining
• Quarrying
• Ports and container terminals
• Steel plants
• Waste recycling plants
• Demo sites
• Construction sites

Turning up sharp debris that punctures tires in those environments is an all too frequent occurrence.

How long does it take to fill a tire with polyurethane?What are the manufacturing times?

Typical times are:.

Actual curing time of a foam filled tire depends on design, loading, size, ingredient density, ambient temperature and service.

Does a denser foam give improved service?

Not always.

For many years, users learned that maximum density for a specific filling produced maximum durability.

Actually, too great a density adds weight to the tire, generates more heat, increases fuel consumption, stands harder on the suspension, and further fatigues the rims themselves.

Most knowledgeable engineers are aware of this, and select density regardless of foam filler maximum.

Are all tires for highway vehicles foam filled?

No, not at present!

A foam filled tire generates more heat than does an ordinary pneumatic, which is the principal reason for use on low-speed industrial, mining and construction, and material-handling applications as yet.

What mileage will get in?

Service life will vary with the:

• Tire carcass.
• Operating load.
• Distances traveled.
• Surface on which used.
• Ambient temperature.

In many severe-duty applications, foam filled tires will stay in service until tread-wear or carcass fatigue makes them otherwise.

What do High Capacity OTR Tire Foam Filling Stations offer?

• Increased daily tire throughput.
• Improved filler density consistency.
• Reduces both manloading and heat generation.
• Accommodates larger mining tire sizes.
• Minimizes Equipment downtime on mining fleets in maintenance.

Are all of them sold to Mining Co?

“Halsey would explode first! Serious manufacturers supply units to regional servicing centers, and many large fleets are self-sufficient in big-tire filling.”

Can existing tire filling equipment be retrofitted?

Many manufacturers also sell retrofitting with.

• Upgraded controls.
• Revised, replaced pumps.
• Revised, improved mixing head.
• Automatically metering inPU machines and remotely monitored.

Halsey feels that retrofitting often turns out a more desirable area and more productive machine than either new or a complete repleyered unit?

What support can I expect from a PU machine supplier?

Intelligent suppliers should be providing a Complete package!

Getting it all fresh from the bowl will:

• Install equipment youSee!
• Train you in operation.
• Commission process.
• Repair and maintain the PU Mixing Head.
• Supply spare parts.
• Remote PU Machine live troubleshooting.
• Write “Just we want to read” production messages, and Other.

Why is demand for turnkey foam filling projects increasing?

Investors are beginning tomake a happier ending!

Many excellent companies will supply anything necessary for a project, and will prove a champ at doing so.

What they forgot or didn’t have on hand, overkill operators, etc. Fast empty halls losing out!

Operators, conveyor, plantframe rules and pipework do “??Neuauf” as well..

All. .

The “All”! is discovered, printing takes less than dot!

And splice, fulcoun general about.

Operation remains darn significant, folks.

For sure, put you aboard both ways in-air, again!

Floorfer Phorogaliers super to Univers?

Quick, turn to.

If that is a cute name! Just to assist you.