It’s simple math: the cost of production is worse than the costs of replacing mining tires. For haulers, wheel loaders, underground, slag handling, port and quarry, machines, even one tire puncture might price production, in a day of out for high cost mining companies, more than buying a tire.

It’s no wonder foam filled tires are gaining market share across mining, into steel plants and waste handling, back to the military and into construction.

The question now is not if you should fill those tires with foam, but in how to fill them, reliably, and with assurance the filling process won’t kill your employees.

Typically for such applications, the best equipment is a fully automated OTR Tire Foam Filling Machine, with high-pressure polyurethane metering system, explosion-proof safety design, automatic ratio control, remote diagnostic and such.

Other suppliers also provide equipment as part of what can be described as a complete polyurethane engineering package, for big industrial materials handling applications, because experience has shown that filling a tire is not simply a job of putting some foam in the tire- it requires control of materials and pressures and precision.

Workers need only stand back and let machines do the heavy work.

Haifeng Automation, or Haifeng PU Technology or Haifeng Engineering—whichever name you see still have survived to be in the business of selling not just complete processing systems, but also the turnkey projects around them:

• PU Safety Shoe Production Lines
• PU Rain Boot Production Line
• OTR Tire Foam Filling Machines
• Solvent-free PU Synthetic Leather Line
• PU Insulated Panel Continuous Line
• Operator training
• Retrofitting
• Commissioning in any country

Why Equipment Selection is More Important than Foam Material Selection

Many buyers concentrate their attention solely on the polyurethane tire fill material specifications.

The more experienced or full time engineers, tend to concentrate first on the filling machine.

This still can be quite a surprise to a first time buyer.

Two mines can use the same flat-proofing materials but still obtain totally different tire service lives because:

• Mixing accuracy
• Density consistency
• Internal pressure distribution
• Voids
• Quality of cure
• Generation of heat during the reaction

are all determined by how the filling operation is controlled.

Rather poor control in the operation can leave hidden air pockets inside a tire. These voids often are not observable until the tread is wearing by heavy-duty use of the vehicle.

The resultant problem, which occurs more often than is ever confessed to, can take the form of:

1. Loads not being evenly distributed
2. Building up excessive heat locally in a short period of time
3. Producing a concentration of loads in the sidewalls
4. Premature tire failure

In a normal mining environment filling quality is found to influence service life more than minor variations in the polyurethane formulation.

Key Equipment Categories for Supplying Miners with Mining Tires with Foam Filling Machines

Manual Foam Filling Systems

These are used by:

• Small workshops
• Agricultural tires
• Light industrial fleets

Characteristics:

• Low investment
• Operator managed accuracy
• Limited production
• High incidence of ratio variation

Typical output:

2-4 tires per shift.

Generally unsuitable for large mining fleets in continuous operation.

Semi-Automatic Foam Filling Machines

Metering pumps introduced with:

• Some basic ratio control
• Perhaps pressure monitoring
• Repeatability improved

Typical use:

• Quarrying
• Construction contractors
• Regional tire service shops

Typical output:

6 – 12 tires per shift.

Automated OTR Tire Filling Machines

For mining “automated” is the goal.

Modern Features:

• PLC process control
• High-pressure metering
• Automatic A/B ratio correction
• Real time pressure monitoring
• Digital production record capability
• Automatic shutdown protection
• Remote trouble shooting capability

Typical Output:

15-30 large OTR tires per shift for sizes larger than 25 inch.

Automated equipment handles larger fills with markedly reduced operator variation in quality of fill.

Critical Features

Mixing Ratio Accuracy

Filling of polyurethane tires requires accurate control of the chemical reaction.

Control should be within ±1% or better.

Where ratios are off 3% or more, the operator may well experience:

• Soft zones in fill
• Incomplete curing of fill
• Loss in load carrying capacity
• Excessive heat

Pump Pressure Stability

The greater the fluctuations in pressure, the poorer the result.

For the mining tire, ±2 bars is advisable.

Filling Capacity

The mining business necessitates a rather large fill.

The pump should fill the tire with foam at such a rate that desired complete filling in turn leads to desired density where:

Explosion-Proofing

Polyurethane filling reacts with heat, and explosion-proofing is a must.

Features include:

• Electric motors
• Grounded equipment
• Temperature gauges
• Release for pressure

Involved especially when processing mining tires of fill mass in excess of a few hundred kilograms.

Equipment Far More Important Than the Tire to Be Filled

Insist equipment of superior quality, yet one of the most neglected features is not to see that the tire has been thoroughly cooled out-of-service.

Field experience bears out that court plenty of times an apparently good tire was never a good fill.

A direct-late-from-pit delivery tire may contain a great deal of internal tire heat and if foam filling starts before tire temperature has time to stabilize, the reaction may be quite accelerated.

Consequences may include:

• Density variation
• Internal stress formation
• Excessive axial expansion pressure
• Shortened tire service life

A knowledgeable filler technician will often check for tire ambient temperature before filling rather than trusting only the machine settings.

The use of ambient temperature controls on fillers handling large OTR tires can cause more improvement in quality than increasing machine pressure or changing chemical.

Which Mining Tires Are Best Suited to Foam Filling?

Foam filling is very effectively used in:

• Underground mining vehicle wheels
• Wheel loaders
• Telehandlers
• Steel plant equipment
• Waste transfer station vehicles
• Quarry equipment
• Military support equipment

Typical benefits include:

• No puncture down time
• Increased equipment availability
• Reduced maintenance intervention
• Improved fleet scheduling

Applications Where Foam Filling is Not Suitable

There are applications where foam filling is not, in general, suitable.

In particular, look very closely at:

• High beam highway vehicles (vehicles which operate at high speed)
• Long distance transport trucks
• Vehicles most concerned with maximum comfort of ride
• Light, weight-sensitive vehicles

A foam filled tire generally weighs more than a pneumatic tire.

In certain transport applications, this added weight may result in lower economy of operation, and increased load on the drive train.

This driving limitation should be observed.

Equipment Selection Matrix

Small Fleet Operations

Ideal solution:

Semi-Automatic Foam Filled Tire Equipment

Appropriate for:

• Under 100 vehicles
• Regional service centers
• Mixed tire sizes

Medium Mining Operations

Ideal solution:

Automatic PU Foam Filling Machine

Ideal for:

• 100–500 vehicles
• Continuous daily operation
• Multiple tire specifications

Large Mining Groups

Ideal solution:

High Capacity OTR Tire Foam Filling Station

Suitable for:

• Centralized tire facilities
• 24-hour production
• Large OTR tires
• International mining operations

Recommended features:

• Remote diagnostics
• Automated recipe management
• Digital quality records
• Predictive maintenance systems

2026 Technology Trends

Many technology patterns are emerging in the foam filled tire industry.

AI-Assisted Process Monitoring

More filling stations nowadays use:

• Pressure trend analysis
• Pump health monitoring
• Predictive maintenance alerts

These technologies identify unusual behaviours before the machine fails in production.

Cloud-Based Remote Troubleshooting

Global mining customers are demanding more:

• Remote commissioning
• Online diagnostics
• Remote software updates
• Remote process optimization support

This way they can achieve lower service response times and prevent longer downtimes.

Low-Emission Polyurethane Systems

Regulations for lower emissions are also impacting equipment design.

More requirement for:

• Eco-friendly PU Foaming Solutions
• Lower VOC processing
• Energy-efficient Reactive Polyurethane Foam metering systems
• Reduction in waste packaging generation

Integrated Polyurethane Manufacturing Platforms

Purchasing trends are showing that many industries are now asking for:

• Complete PU Manufacturing Plants
• One-stop Polyurethane Solutions
• Custom Polyurethane Processing Plant Layout Design
• Custom PU Machinery Turnkey Project Solution
• Operator Training Programs
• PU Mixing Head Repair and Maintenance
• Retrofitting Old PU Machines

Integrated engineering support solutions often bring lower startup times and more straightforward long-term maintenance management.

How to Choose the Best Supplier

Before buying an OTR Tire Foam Filling Machine, buyers should consider:

1. Mining project references
2. Accuracy of ratio control
3. Available fill capacity per hour
4. Explosion proof design specifications
5. Remote troubleshooting capability
6. Spare parts availability
7. Operator training services
8. Long term technical support

Suppliers who can also provide overall engineering services are generally of more operational value than simple machine vendors.

Because the effect of mining tire filling depends on equipment, the resulting physical behaviour of the material, operator training and process control all working in concert.

Suppliers who bring all those elements to the mining company looking for long term tire reliability will generally offer the best equipment.

In the area of high reliability OTR tire filling equipment the best equipment would be a fully automatic polyurethane foam filling system backed up by comprehensive engineering services, commissioning expertise and long term technical support over the life of the installation.

FAQ

What is the best equipment for filling mining tires with foam?

For large mining operations, an OTR Tire Foam Filling Machine that is fully automatic at the machine level is generally preferred.

The best equipment will incorporate features such as:

• High pressure metering
• Automatic ratio control
• Online monitoring of pressure
• Explosion-proof, trip-safe systems
• Remote access troubleshooting capability

These features help achieve more uniform fill density and reduce potential for void formation inside the tire.

How much does an OTR tire foam filling machine cost in 2026?

The cost of an OTR tire foam filling machine depends on fill capacity, level of automation and explosion proof design.

Typical equipment costs:

• Manual systems – USD 5,000–20,000
• Semi-automatic systems – USD 20,000–80,000
• Fully automatic mining tire filling stations – USD 80,000–300,000+
• Customized turnkey tire filling plants – USD 300,000–1,000,000+

Customized projects may incorporate:

• Fill material storage
• Air compressors
• Operator training
• Commissioning services

What is the service life of a foam filled mining tire?

Service life naturally varies widely with regard to:

• Operating duty
• Number of load cycles
• Tire quality
• Filling quality

In many mining and quarrying applications, foam-filled tires remain in service throughout the entire tread life of the tire.

Foam filled tires will not go flat, even if the tire casing itself is punctured or cut.

The tire continues supporting the load through the solid polyurethane elastomer that has replaced air in the tire cavity.

What sizes of tire may be filled using OTR Automatic Tire Foam Filling Equipment?

Modern machines may be used in workshops as well as on-site and are capable of filling:

• Forklift tires
• Skid steer loader tires
• Wheel loader tires
• Telehandler tires
• Underground mining vehicle tires
• Large OTR mining vehicle tires
• Heavy agricultural and forestry tires

Many high-capacity systems can process tires exceeding 49 inches in rim diameter.

What is meant by a manual machine compared with an auto-fill machine for tire foam filling?

Manual machines depend to a greater degree on operator skill and generally have lower output.

Automatic machinery can:

• Control material ratio more accurately
• Maintain filling pressure
• Monitor production digitally
• Increase productivity
• Reduce material waste

For mining operations running day and night, automatic fill equipment generally provides a more consistent product.

Which equipment works well with filled tyres?

Foam filling is ideal for:

• Wheel loaders
• Underground mining equipment
• Quarry machinery
• Waste handling vehicles
• Steel plant vehicles

However, it may not be suitable for:

• High-speed highway vehicles
• Long-distance transportation trucks
• Applications sensitive to additional tire weight

Choose tyres and rim equipment based on expected vehicle speed and operating conditions.

What density of polyurethane is normal in mining tyre filling?

Most mining tyre fillers vary from about:

0.90–1.10 g/cm³

The ideal density depends on:

• Vehicle load
• Tire size
• Ground conditions
• Desired ride characteristics

Higher density filler generally increases load-carrying capacity, but also increases tire weight.

How long is it going to take to fill one of those large OTR mining tyres?

Filling time depends on tire volume and machine output.

Typical figures:

• Medium wheel loader tyre – 30 to 90 minutes
• Quarry tyre – 1 to 3 hours
• Ultra large mining tyre – 3 to 8 hours

Curing time is additional and depends on formulation and ambient temperature.

What after-installation support should I get from a supplier?

You should receive:

• Equipment installation and commissioning
• Operator training
• Filling process optimization
• PU Mixing Head Repair & Maintenance
• Spare parts supply
• Remote diagnostics
• Preventive maintenance guidance
• Retrofitting support

Professional support helps maximize equipment uptime and filling quality.

Can existing tyre service workshops be upgraded into foam-filling plants?

Yes.

Many companies choose to upgrade existing facilities rather than build new ones.

A typical upgrade may include:

• Polyurethane supply systems
• Metering and mixing equipment
• Filling stations
• Ventilation systems
• Protective instrumentation
• Quality control systems

Engineering evaluation is generally recommended before installation.

Why in 2026 are more and more mining companies investing in automated in-house foam filling stations?

The main drivers include:

• Rising labour costs
• Higher equipment uptime requirements
• Increasing safety standards
• Higher tire replacement costs
• Expansion of large-scale mining operations

Automated systems help reduce the hidden costs associated with breakdowns and production losses.