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What are the food-grade lubricants? Does pure vaseline count?
Lubricants certified by NSF H 1 in the United States belong to food-grade lubricants. Including food-grade hydraulic oil, gear oil, chain oil, compressor oil, heat transfer oil, white oil, spray and grease.

Vaseline (petroleum by-product) can also be used for simple lubrication if it is certified by NSF H 1.