In extremely high temperature environments, what caster materials are suitable for use ?

Recommended Caster Materials for Extremely High-Temperature Environments
Extremely high-temperature environments (generally defined as temperatures above 150°C, such as in high-temperature workshops, around industrial furnaces, and in the sun) place extremely high demands on casters for heat resistance and mechanical strength stability. Casters must be selected for materials that maintain structural integrity and load-bearing capacity even at high temperatures. The following four categories are recommended:

1. High-Temperature Modified Nylon (150°C-200°C)
High-Temperature Modified Nylon is an upgraded version of ordinary nylon. By adding glass fiber, high-temperature additives (such as aromatic polyamide), or using specialized grades (such as PA46 and PA6T), its upper heat resistance is significantly increased. It is a cost-effective choice for medium- and high-temperature environments:

Performance Advantages: High heat deflection temperatures (HDT) can reach 180-220°C, and at 150°C, it can maintain 60%-70% of its normal-temperature load capacity (a single wheel can carry 150-400kg). Nylon also offers the wear resistance and low noise characteristics of the wheel, and the wheel surface is less likely to soften and stick to the floor due to high temperatures, making it suitable for transporting lightweight equipment in high-temperature workshops. Suitable for: Plastic drying workshops operating at 150°C-200°C, carts around food baking lines, and high-temperature testing areas for electronic components.

Note: Requires a stainless steel caster frame (to prevent rusting of ordinary steel casters) and high-temperature bearings (such as deep groove ball bearings rated at 200°C), filled with a lithium-based composite grease (rated at -20°C-180°C).

2. All-Metal Material (Stainless Steel/Cast Iron, 200°C-600°C)
All-metal casters (both the wheel body and frame are metal) offer high heat resistance and no risk of softening or deformation at high temperatures, making them the ideal choice for applications involving extreme high temperatures and heavy loads.

Performance Advantages: Stainless steel (304, 316) and cast iron materials maintain rigidity below 600°C, offering exceptional load capacity (single wheel supports 500-3000kg). The wheel body is hardened to a surface hardness exceeding HRC50, offering far superior wear resistance compared to plastic, making it suitable for supporting and transporting heavy equipment at high temperatures. Suitable for: Metal heat treatment workshops (200°C-600°C) (including quenching parts transfer vehicles), industrial furnace peripheral equipment (such as kiln push carts), and raw material turnover racks in high-temperature forging workshops.

Precautions: Poor elasticity and high rolling noise at high temperatures (15-20 decibels louder than plastic wheels). Bearings should be regularly filled with high-temperature solid lubricants (such as molybdenum disulfide grease, resistant to 800°C) to prevent metal parts from seizing at high temperatures.

3. Ceramic Material (Alumina/Silicon Nitride, 800°C-1200°C)
Ceramic casters feature a high-temperature ceramic wheel body, offering excellent heat and corrosion resistance. They are suitable for ultra-high temperature environments with corrosion risks.

Performance Advantages: Alumina ceramics are resistant to temperatures of 800°C, while silicon nitride ceramics can withstand temperatures up to 1200°C. They resist oxidation and deformation at high temperatures. Their smooth and dense surface is resistant to strong acids and alkalis (such as molten salts and corrosive gases at high temperatures). They also offer a low coefficient of friction and low rolling resistance, making them suitable for ultra-high temperature and corrosive environments. Suitable for: 800°C-1200°C ceramic sintering kilns (kiln car casters), high-temperature chemical reactors (supporting equipment containing corrosive gases), and glass manufacturing workshops (molten glass transfer equipment).

Note: Ceramic materials are highly brittle and should be protected from impact (such as heavy objects) at high temperatures. Due to their high cost, they are only recommended for special ultra-high-temperature applications. The recommended load capacity per wheel is 100-500kg.

4. Fiberglass Reinforced Plastic (FRP, 150°C-250°C)
Fiberglass reinforced plastic (FRP) is a composite of glass fiber and high-temperature resistant resin (such as phenolic resin and epoxy resin). It combines heat resistance with lightweight advantages, making it suitable for high-temperature and light-load applications:

Performance Advantages: Heat deflection temperature of 180-280°C, with only a 10%-15% loss in mechanical strength at 200°C. They are 40%-50% lighter than metal, requiring less effort to push, and are resistant to aging and UV rays, making them suitable for high-temperature, outdoor applications (such as outdoor equipment exposed to the summer sun). Suitable for: Carts used in high-temperature testing areas for photovoltaic modules (150°C-250°C), cleaning equipment used in outdoor high-temperature environments (such as asphalt road cleaning vehicles), and lightweight high-temperature instrument support casters.

Precautions: The load capacity is relatively low (single wheel load ≤ 150kg); the surface is easily scratched by sharp objects; avoid use on rough, raised surfaces.