Which caster material is most oil-resistant?

In industries like industry, catering, and auto repair, where oils (such as motor oil, lubricants, and cooking oils) are common, a caster's oil resistance directly determines its lifespan and safety. The following caster materials offer outstanding oil resistance and can be selected based on specific needs:

1. Polyurethane (PU)

Polyurethane is one of the most widely used oil-resistant caster materials, offering both elasticity and chemical resistance. Its stable molecular structure makes it resistant to oil penetration and swelling. Even after long-term contact with mineral and vegetable oils, it maintains good hardness and load-bearing capacity. It also has strong resilience and low noise when pushed, making it suitable for applications requiring quiet operation and floor protection, such as food processing workshops and precision equipment handling. However, it can soften easily in high-temperature (over 80°C) oil environments and should be avoided from prolonged exposure to high-temperature oil.

2. Nylon (PA) Material
Nylon casters' oil resistance stems from their crystalline polymer structure, making their molecular chains difficult for oils to damage. Even with prolonged contact with diesel and motor oil, they are resistant to cracking and deformation. They also offer exceptional load-bearing capacity (a single wheel can carry hundreds of kilograms) and far surpass rubber in wear resistance. However, nylon's high hardness and poor elasticity make it noisy when pushed and prone to becoming brittle at low temperatures. It is more suitable for heavy-load, ambient-temperature oily environments such as industrial workshops and storage equipment, but not for applications requiring high levels of quietness and floor smoothness.

3. Nitrile Rubber (NBR) Material
Nitrile rubber is an elastic material specifically designed for oily environments. Containing acrylonitrile groups, it has minimal oil compatibility. However, it offers excellent resistance to mineral, animal, and vegetable oils, and is flexible, adaptable to uneven surfaces, and provides a strong cushioning effect. However, it has weaker wear resistance and lower load-bearing capacity than polyurethane and nylon. It is susceptible to aging when exposed to gasoline and strong solvents. It is more suitable for lightweight equipment (such as tool carts and small storage racks) and should avoid contact with highly corrosive oils.

4. Polytetrafluoroethylene (PTFE, Teflon) Material
PTFE is an extremely chemically resistant material, resistant to almost all oils (including strong acids and bases). It is also resistant to high temperatures (up to 260°C) and low temperatures, making it suitable for extreme oil environments (such as chemical reactor handling and high-temperature oil processing equipment). However, this material is costly and has low hardness, so it is rarely used in caster bodies alone. It is more often used as caster bearings or surface coatings to enhance overall oil resistance.

In summary, if oil resistance, quietness, and load-bearing properties are a combined requirement, polyurethane is preferred; if heavy loads, wear resistance, and normal-temperature oil resistance are important, choose nylon; if lightweight, flexible, and suitable for use in normal oil environments are required, choose nitrile rubber; for extreme oil environments, consider casters with PTFE components. At the same time, the material of the caster bracket (such as galvanized steel, stainless steel) must also meet the oil resistance requirements to prevent the bracket from being corroded by oil.