What is the difference between lubricants used on industrial casters in the food industry and non-food grade lubricants?

The Core Difference Between Food-Grade and Non-Food-Grade Lubricants (For Casters in the Food Industry)

Lubricants used in casters for the food industry are crucially safe, and the key difference lies in whether they ensure food safety:

Safety Certification and Compliance:

Food-Grade: Requires stringent certifications (e.g., NSF H1, FDA 21 CFR 178.3570, GB 4806.10) and is approved for use in equipment (such as casters) where "incidental food contact is possible." It complies with food contact material regulations.

Non-Food-Grade: Has no food contact certification and only meets industrial performance standards. It is prohibited for use in food processing areas, and non-compliant use will result in penalties.

Ingredients and Safety (Core Differences):

Food-Grade: Uses safe base oils such as highly refined food-grade white oil, synthetic esters, or PFPE, and passes acute, chronic, and genetic toxicity testing. Additives (antioxidants, rust inhibitors, etc.) are selected from the food-grade list (e.g., natural vitamin E, citric acid), and toxic substances (lead, cadmium, formaldehyde-releasing substances) are strictly prohibited.

Non-food grade: Uses industrial mineral oil (which may contain impurities such as polycyclic aromatic hydrocarbons and heavy metals) or inexpensive synthetic oil. Additives (such as chlorinated paraffin and sodium nitrite) prioritize performance and often contain highly toxic ingredients.

Performance and Environmental Requirements:

Both require basic lubricity.

Food grade: Additional requirements include resistance to water and food residue contamination, high temperature resistance (>200°C and no volatile toxic substances), and compatibility with the food-grade elastomer material used in casters.

Non-food grade: Emphasizes extreme industrial performance and may be less resistant to contamination or may decompose toxic substances at high temperatures, which can easily cause degradation of food-grade elastomers.

Risks and Consequences:

Food grade: For incidental food contact, meets trace residue safety standards (e.g., LD50 >5000 mg/kg), presenting an extremely low risk.

Non-food grade: Food contact may cause short-term irritation or serious long-term health risks (liver and kidney damage, carcinogenicity).

Labeling and Traceability:

Food grade: Clearly label with certification, ingredients, and a safety data sheet (SDS), with traceable safety reports.

Non-food grade: Only industrial parameters are listed, ingredients are unclear, and there is no food safety information.

In summary: Food-grade lubricants are strictly regulated and prioritize food safety. Non-food grade lubricants focus solely on industrial performance, completely disregarding food contact safety. Casters used in the food industry must use food-grade lubricants, as this is a regulatory requirement and a bottom line for protecting public health.