The effect of high temperature on AGV casters is gradual: the hotter the environment, the more failure modes appear, and the bigger the difference in the right solution. Between an ordinary workshop at 40°C and a foundry floor above 150°C, the choice of tread material, bearing, grease, and bracket changes completely. Asking “which caster works at high temperature” without a temperature figure is meaningless — the first step of any selection is to confirm the actual ambient temperature range, then match every component to it. This guide sets out what each temperature band demands and how to keep casters running in hot production environments.
How High Temperature Affects AGV Caster Components
Heat attacks every component of the caster, but at different rates. The tread is usually the first limit: standard polyurethane (PU) is rated to approximately 60-80°C. Above that range the tread softens, hardness and load capacity drop, and above 100°C permanent deformation can occur. Softened PU also becomes tacky, which creates adhesion against the floor and visibly increases rolling resistance — a direct penalty for AGV drive efficiency.
Grease and bearings fail next. Ordinary lithium grease has a dropping point of about 175°C, but it thins and starts to bleed out of the bearing above roughly 80°C; once lubrication is lost, the bearing runs dry and wear accelerates sharply. Metal components also expand with heat: bearing internal clearances shrink and, in severe cases, the bearing can seize, especially when the axle and bearing are made of different materials with different expansion coefficients. The bracket degrades more slowly but just as surely — the yield strength of carbon steel drops by roughly 10% at 200°C and about 30% at 400°C, and prolonged exposure causes creep that undermines long-term reliability.
Selecting AGV Casters by Temperature Range
Because component limits differ so much, the practical approach is to select by temperature band rather than by a single “high-temperature” specification. The table below summarizes the recommended configuration for each band; the load-derating column reflects how much the effective working load should be reduced to compensate for material softening.
| Temperature Range | Tread | Bearing & Lubrication | Load Derating |
|---|---|---|---|
| 40-60°C (ordinary hot workshop) | Standard PU, Shore A 92-95 | Sealed bearings with lithium complex grease (dropping point above 200°C) | Reduce load 10-15% |
| 60-80°C (near welding, beside drying lines) | High-temperature PU formulation, Shore A 95 | High-temperature sealed bearings with polyurea grease (dropping point above 260°C) | Reduce load 20% |
| 80-150°C (beside furnaces, foundry floors) | High-temperature rubber (silicone or fluoro) or high-temperature nylon — no PU | Stainless steel high-temperature bearings with high-temperature grease or solid lubrication | Shorten inspection and replacement cycles |
| Above 150°C | Ceramic or metal wheels (custom) | Solid lubrication only, no grease | Custom engineering required |
In the 40-60°C band, standard PU at the harder end of Shore A 92-95, combined with sealed bearings and lithium complex grease, handles most workshops provided the working load is derated by 10-15%. The 60-80°C band is the practical ceiling for PU: a high-temperature PU formulation at Shore A 95 with polyurea grease keeps running, but load should be reduced by about 20%. Above 80°C, PU is no longer usable. Between 80°C and 150°C, the tread must move to high-temperature rubber (silicone or fluororubber) or high-temperature nylon, the bearing to stainless steel with high-temperature grease or solid lubrication, and the bracket to stainless or heat-resistant steel; service life is limited, so inspection and replacement intervals must be shortened. Above 150°C, standard products no longer apply and a customized solution — ceramic or metal wheels, solid lubrication — is required; contact the manufacturer directly for engineering support.
Maintenance in High-Temperature Environments
High temperature accelerates material aging, so inspection frequency must be higher than in normal-temperature plants. Check the tread daily for softening, deformation, and adhesion; where possible, measure tread hardness regularly with a durometer. A drop of more than 5 Shore degrees from the initial value indicates the material is aging and replacement should be planned. After operation, touch the bearing zone: normally it runs slightly above ambient temperature, and if it feels burning hot (clearly above 60°C), lubrication has likely failed and the bearing must be serviced before it seizes.
Grease selection is the easiest step to get wrong. Below 80°C, lithium complex grease is generally sufficient; above 80°C, switch to polyurea-based or perfluoropolyether grease, and choose a grease whose dropping point is at least 50°C above the working temperature to keep margin. Using ordinary grease as a shortcut in hot environments is a false economy — once it bleeds out, the bearing burns out quickly and the whole caster is lost. Because caster life in hot environments is usually far shorter than at room temperature, adopt preventive replacement rather than waiting for visible deformation or seizure; a sudden failure in a hot plant is far more costly than a scheduled one.
The Trade-offs of Nylon Wheels at High Temperature
Nylon withstands heat up to about 100-120°C, which makes it look like an obvious answer for hot environments. The catch is what nylon gives up: it provides no cushioning, it is noisy, and it can damage floors, which makes it unsuitable on epoxy flooring. On concrete floors with no strict noise requirement, nylon is a legitimate option in high-temperature areas — but it must be understood as a trade, not a universal solution: it solves the temperature problem at the cost of cushioning and quietness.
Selecting AGV casters for high-temperature environments always involves matching several dimensions at once — tread material, lubrication, bearing, and bracket. If the right combination is not obvious, provide the manufacturer with the ambient temperature range, load, and operating frequency and let the selection be verified against real conditions. YTOP’s industrial caster product line covers multiple tread configurations: below 80°C, its high-temperature PU tread products are the relevant option, while above 80°C, special high-temperature material solutions should be confirmed with the engineering team before purchase.
Related Reading
- How to Select AGV Casters: Complete Parameter Guide
- What Role Do AGV Casters Play in Automated Material Handling Systems?
- Why Do AGV Casters Use Polyurethane? Material Analysis
- How to Select Caster Bearings: Ball Bearing vs. Sealed Guide
Post time: Oct-10-2026