AGV Casters in High-Temperature Environments: Selection by Heat Range

High-temperature environments affect AGV casters gradually — the higher the temperature, the more problems, and the wider the difference in selection solutions. From ordinary high-temperature workshops around 40°C to foundry shops above 150°C, each range demands different materials and maintenance. Asking vaguely “what caster works for high heat” is meaningless; the key is to confirm the actual ambient temperature range first.

How Heat Attacks Each Component

• Tread: the operating ceiling of standard PU is roughly 60-80°C. Above that, PU softens and loses hardness and load capacity; above 100°C, permanent deformation can occur. Heat also makes PU tacky, causing adhesion on the floor and higher rolling resistance.
• Grease: ordinary lithium grease has a dropping point near 175°C, but it thins above 80°C and can flow out of the bearing. Once lubrication is lost, the bearing runs dry and wear accelerates sharply.
• Bearings: metal expands with heat, internal clearances shrink, and in severe cases the bearing seizes. Different axle and bearing materials expand at different rates, changing the fit state.
• Brackets: carbon steel yield strength drops roughly 10% at 200°C and 30% at 400°C. Long-term heat also causes creep, hurting bracket reliability over time.

Selection by Temperature Range

40-60°C (ordinary high-temperature workshop): standard PU treads, hardness on the harder side of Shore A 92-95 to offset softening; sealed bearings with high-temperature grease (lithium complex, dropping point above 200°C); standard carbon-steel powder-coated brackets. Cut working load 10-15% to compensate for material softening.

60-80°C (near welding stations, beside drying lines): high-temperature PU formulation at Shore A 95; high-temperature sealed bearings with polyurea-based grease (dropping point above 260°C); thickened carbon-steel brackets. Reduce working load by 20%. This range is the practical ceiling of PU — above 80°C, stop using PU.

80-150°C (beside furnaces, foundry workshops): PU is out. Choose high-temperature rubber (silicone or fluoro rubber) or high-temperature nylon; stainless-steel high-temperature bearings with high-temperature grease or solid lubrication; stainless or heat-resistant steel brackets. Caster life is shorter here, so shorten inspection and replacement cycles.

Above 150°C: custom solutions only — ceramic or metal wheels, and solid lubrication with no grease. Contact the manufacturer directly for customization.

Maintenance in High Heat

Heat accelerates aging and wear, so inspect more often than at room temperature:

• Check treads daily for softening, deformation and adhesion. If possible, measure tread hardness regularly — a drop of more than 5 Shore degrees from the initial value means aging is starting; consider replacement.
• Touch the bearing area after operation. Normal bearing temperature is slightly above ambient; burning hot (clearly over 60°C) suggests lubrication failure.

High-temperature caster life is usually much shorter than at normal temperature — shorten preventive replacement cycles. Don't wait for tread deformation or bearing seizure; a sudden failure in a hot environment costs more.

Grease: The Easy-To-Get-Wrong Detail

Below 80°C, lithium complex grease is basically enough; above 80°C, switch to polyurea-based or perfluoropolyether grease, with a dropping point at least 50°C above working temperature for margin. Using ordinary grease in high heat — once it leaks out, the bearing burns out quickly.

The Nylon Trade-off

Nylon resists heat well and can work to 100-120°C, so some people pick nylon wheels for hot areas thinking “heat resistance is enough.” But nylon offers no cushioning, is noisy, and damages floors — a poor fit for epoxy flooring. On concrete with no strict noise limits, nylon can work in high heat. Just be clear: nylon is not a universal high-temperature answer — it solves heat resistance by sacrificing cushioning and quiet. For tread comparisons, see our rubber vs PU vs nylon guide.

High-temperature AGV caster selection is complex, spanning material, lubrication and bracket matching. If you cannot settle the solution, give the manufacturer the ambient temperature range, load and operating frequency — and let them recommend. For load planning at elevated heat, review our load capacity guide.