Under the former program, which was managed by the U.S. Department of Agriculture (USDA), Washington, and terminated in 1998, heat transfer fluids required food-additive approval. This requirement ensured the safety of edible product in the event of incidental contact with food.
The NSF Nonfood Compounds Registration Program steering committee, with guidance from USDA, recommended that NSF register heat transfer fluids under a new category, HT. Fluids registered for incidental contact with food will be listed under HT-1. Fluids for which no contact with food is allowed will be listed in HT-2. Ingredients for use in heat transfer fluids will be listed in category codes HTX-1 and HTX-2.
The guidelines can be downloaded at www.nsf.org/usda or ordered by calling NSF at (800) 673-6275.