A food-grade grease is one registered with NSF as H1: safe for incidental contact with food. That is a formulation restriction, not a performance claim — the grease must use base oils and additives from an approved list, which is why H1 greases are often slightly weaker in extreme pressure than industrial equivalents. In food plants the alternative is not a better grease but a redesign.
NSF registers a lubricant as H1 when every ingredient appears on the FDA list of substances permitted for incidental food contact, and the product is made under a controlled formulation. It does not certify the grease as safe to eat, and it does not certify performance. A cheaper H1 grease and an expensive one are both H1; the difference is how well they resist water and load.
Most food plant bearing failures are water failures, not lubrication failures. Daily washdown with detergent at 60–80 °C will emulsify a standard lithium grease in weeks. Aluminium complex and calcium sulphonate H1 greases are chosen for water resistance first and food compliance second — and the bearing is normally a 2RS or a stainless housed unit, so the grease is only the second line of defence.
| Certification | NSF H1 — incidental food contact |
|---|---|
| Not the same as | H2 — no food contact allowed, lubricant only |
| Common thickener | Aluminium complex, calcium sulphonate |
| Temperature | −30 to +120 °C typically |
| Water resistance | Good to excellent, by design |
| Base oil | White mineral oil or synthetic, food-grade approved |
| Typical use | Conveyors, mixers, fillers, packaging lines |
| Cost | 2–5 times an industrial grease |
| Grade | Food contact | Typical use | Cost |
|---|---|---|---|
| NSF H1 | Incidental contact permitted | Above or beside open product | 2–5× |
| NSF H2 | No contact permitted | Sealed areas, plant room | 1.5–3× |
| Standard industrial | Not permitted | Non-food machinery | 1× |
No. It is safe for incidental contact in small quantities; it is not a food ingredient and must not be present in the product.
H1 permits incidental food contact. H2 is a lubricant for food plants used where contact cannot occur, such as a sealed gearbox in a plant room.
Where washdown is frequent, yes — a stainless or thin-dense-chrome housed unit outlasts painted steel by a wide margin. Grease alone does not stop corrosion.
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