What materials are suitable for casters used in the food processing industry?

Casters used in the food processing industry must meet three core requirements: hygiene and safety, resistance to environmental corrosion (moisture/oil/detergents), and load-bearing stability. Material selection should focus on the overall structural compatibility of the wheel, bracket, and bearing. Specific recommendations are as follows:

1. Wheel Material: Food-grade polyurethane (PU) or modified rubber is preferred.
The wheel directly contacts the floor and is exposed to potential food residue and detergents. The material must be non-toxic, easy to clean, and resistant to oil and mild acids and alkalis.
Food-grade polyurethane (PU): The industry's preferred material.

Advantages include compliance with food-grade certifications such as FDA and EU 10/2011, odorlessness, and the migration of harmful substances, preventing food contamination. Its smooth, non-porous surface resists stain accumulation and can be cleaned with a simple wipe or rinse, making it suitable for the frequent cleaning needs of food processing facilities. It is also resistant to oil, mild acids and alkalis (such as detergents and disinfectants), and can withstand the erosion of oils and fats during processing. It also offers excellent elasticity and vibration damping, preventing food from shattering or causing noise during movement. Be sure to choose a solid polyurethane wheel. Hollow wheels easily harbor dirt and have poor load-bearing properties, making them unsuitable for food applications.

Modified Nitrile Rubber (NBR): A supplementary option for heavy-duty/highly oily applications
If your workshop primarily processes oils and fats (such as meat and fried foods), consider choosing a modified nitrile rubber wheel, which offers greater oil resistance than standard polyurethane and offers strong tear resistance, making it suitable for carrying heavy material carts (e.g., over 500kg). However, be sure to ensure the rubber material meets food-grade standards (avoiding toxic additives). When cleaning, be aware that the rubber surface easily absorbs oil and dirt, so wipe it promptly with a neutral detergent.

2. Bracket Material: Stainless steel is a must, with SUS304/SUS316L preferred.

Food processing workshops are humid and prone to frequent cleaning agents (some containing weak acids and alkalis). Ordinary carbon steel brackets are prone to rust, polluting the environment and shortening their lifespan. Stainless steel brackets are recommended:

SUS304 stainless steel: The preferred choice for general applications.

It offers excellent resistance to moisture, weak acids, and alkalis, resisting corrosion from detergents and disinfectants used in daily cleaning. Its smooth, easy-to-clean surface eliminates the risk of rust. Bracket thickness must be ≥3mm to ensure stable load-bearing capacity (e.g., 4 brackets can support 800-1000kg). This prevents deformation and fracture of thin metal brackets (≤2mm). SUS316L stainless steel: Exclusively for high-corrosion environments (such as pickling/fermentation workshops).

If the workshop operates in a high-salt (such as pickling) or high-acid (such as fruit processing) environment, SUS304 stainless steel may corrode and should be upgraded to SUS316L. SUS316L, containing molybdenum, offers enhanced resistance to salt spray and strong acids, allowing it to withstand long-term corrosion from pickling solutions and acidic detergents. It is the only choice for extremely corrosive environments, but the cost is higher than SUS304.

3. Bearing Material: Choose "stainless steel sealed bearings" over ordinary carbon steel bearings.

Bearings are the core of casters' rotation. Rust or dirt can contaminate cleaned floors or food. Therefore, they must meet dual requirements for "rust prevention and sealing":

Stainless steel bearings (such as SUS304 bearings) must be used to prevent rust residue from ordinary carbon steel bearings.

Double-sided sealed bearings (such as 2RS rubber seals) must be selected to isolate the bearing from moisture, food debris, and oil. This prevents bearing seizure and failure, prevents internal grease leakage and contamination of food, and reduces cleaning frequency.

Summary: The "Optimal Material Combination" for Food Processing Casters
General food processing workshops (such as fruit and vegetable washing and baking): Food-grade solid polyurethane wheel + SUS304 stainless steel bracket + SUS304 sealed bearings

Excessively oily workshops (such as meat processing and frying): Modified nitrile rubber wheel (food grade) + SUS304 stainless steel bracket + SUS304 sealed bearings

Highly corrosive workshops (such as pickling and fermentation): Food-grade solid polyurethane wheel + SUS316L stainless steel bracket + SUS316L sealed bearings

All materials require suppliers to provide "food grade certification reports" to avoid using uncertified, inferior materials and ensure compliance with food safety regulations.