What Is Food-Grade Lubricant (NSF H1)?

Why Food-Grade Lubricants Exist

No matter how good a machine's design, it can't guarantee lubricants will never touch food: oil from bearings may be flung off, oil from chains may drip, and oil picked up during repairs may remain. The idea behind food-grade lubricants is that, should there be incidental contact with food, the ingredients in the formulation are within acceptable limits.

The most widely cited classification internationally comes from NSF International's Nonfood Compounds Registration Program. This classification was originally administered by the U.S. Department of Agriculture (USDA) and later transferred to NSF; registered products are listed in the publicly available NSF White Book.

How Do H1, H2, and H3 Differ?

• H1: For parts with possible incidental contact with food, such as bearings, chains, and gears above food areas. Formulation ingredients follow U.S. federal regulation 21 CFR 178.3570 (lubricants with incidental food contact), which requires the amount used to be the minimum needed to achieve the technical effect, and sets limits on certain ingredients such as "not to exceed 10 ppm in food." The commonly cited "H1 incidental contact limit of 10 ppm" comes from this.
• H2: For parts with no food contact, such as areas outside the food zone or the interior of fully enclosed equipment. H2 is not food grade; it simply must not contain certain harmful substances.
• H3: Soluble oils used to clean and prevent rust on hooks, trolleys, and similar equipment during storage. According to the Society of Tribologists and Lubrication Engineers (STLE), H3 is not an incidental-contact lubricant, and equipment must be cleaned of it before use.
• 3H: Release agents or anti-stick agents with direct food contact, such as oils used on baking pans and mold surfaces, which fall under a separate set of food additive-related rules.

There's also ISO 21469, an international standard for the hygiene of lubricant formulation, manufacturing, and handling; some products hold both H1 registration and ISO 21469 certification.

Do You Have to Use H1?

Taiwan's regulations don't directly say "NSF H1 must be used," but they do require certain outcomes:

• Article 7 of the Standards for Food Factory Construction and Equipment (食品工廠建築及設備設廠標準): Food machinery must be constructed so as to keep lubricating oil and other potentially contaminating substances out of products.
• Annex 3 of the Regulations on Good Hygiene Practice for Food (食品良好衛生規範準則): Processes must have measures to prevent foreign matter from entering products.
• Article 37 of the Regulations on Good Hygiene Practice for Food (for the food additive industry) also requires equipment to prevent lubricating oil from getting in.

Using food-grade lubricants such as H1 on parts that may contact food is the most common way to meet these requirements; many export customers, retailers, and food safety certification audits also require it. For fully enclosed parts separated from the food zone (such as the inside of a sealed gear reducer), whether to use H1 can be decided based on risk assessment and the manufacturer's recommendation.

A reminder: H1 doesn't mean it can be added to food; it only lowers the risk "just in case." Oiling should still be sparing and precise, with excess wiped off. For details, see Lubrication Maintenance: Where to Oil and How Often.

How to Check Whether a Lubricant Is H1

1. Check the label: Labels on H1-registered products usually carry the NSF mark, the registration category (H1), and the registration number.
2. Verify online: Go to NSF's Nonfood Compounds Listing (White Book) website and search by company name, product name, or registration number to see whether the product is listed and in which category. Note that some products in the listing are marked as not registered for use in the United States.
3. Confirm it's still valid: Registrations can lapse or change, so when purchasing, go by the current status in the listing.
4. Request documents: Ask the supplier for proof of registration and the safety data sheet (SDS).

Common Mistakes

• Mixing different lubricants on the same machine, which may be incompatible with each other.
• Storing food-grade and general industrial oils together and grabbing the wrong one.
• Thinking "cooking oil" can be used to lubricate machines: cooking oil easily oxidizes, turns rancid, and becomes sticky, and its lubricating performance and stability are inferior to dedicated food-grade lubricants.

FAQ

Q: What's the difference between H1 and H2?
A: H1 can be used on parts with possible incidental food contact; H2 can only be used on parts with no food contact and is not food grade.

Q: What is H3?
A: A soluble rust-preventive oil used to protect equipment from rust during storage, which must be cleaned off before use.

Q: How do I confirm a lubricant is H1?
A: Look for the NSF mark and registration number on the label, then enter the number in the NSF White Book listing to verify.

Q: Do Taiwan's regulations require H1?
A: The regulations don't specify H1, but they require equipment to keep lubricating oil out of products; using H1 on parts that may contact food is the most common approach.