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U.S. Department of Health and Human Services

Threshold of Regulation (TOR) Exemptions
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TOR number 1998-020

Threshold of Regulation Exemptions are generally applicable and are effective for the food contact substance (FCS) for the listed intended use regardless of manufacturer or supplier.
Food Contact Substance: Polyvinyl alcohol (PVA) crossed-linked with 1,3,5-benzenetricarbonyl trichloride and piperazine
Use Limitations*: At a maximum use level of 16% by weight as a component of the barrier layer of reverse osmosis membranes complying with 21 CFR 177.2550.
Requestor: Keller and Heckman on behalf of Hydranautics.
Quick links to regulation: 177.2550

*For references to food types and conditions of use, see Food Types & Conditions of Use for Food Contact Substances.
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