21 C.F.R. § 178.3125

Anticorrosive agents

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The substances listed in this section may be used as anticorrosive agents in food-contact materials subject to the provisions of this section:

SubstancesLimitations
Zinc hydroxy phosphite (CAS Reg. No. 55799-16-1)For use only as a component of resinous and polymeric food-contact coatings intended for repeated use in contact with dry foods.
[50 FR 21835, May 29, 1985]