Code of Federal Regulations Title 21. Food and Drugs § 21.178.3010 Adjuvant substances used in the manufacture of foamed plastics

Azodicarbonamide

For use as a blowing agent in polyethylene complying with item 2.1 in § 177.1520(c) of this chapter at a level not to exceed 5 percent by weight of finished foamed polyethylene.

1,1-Difluoroethane (CAS Reg. No. 75-37-6)

For use as a blowing agent in polystyrene.

Isopentane

For use as a blowing agent in polystyrene.

n-Pentane

Do.

1,1,2,2-Tetra-chloroethylene

For use only as a blowing agent adjuvant in polystyrene at a level not to exceed 0.3 percent by weight of finished foamed polystyrene intended for use in contact with food only of the types identified in § 176.170(c) of this chapter, Table 1, under Categories I, II, VI, and VIII.

Toluene

For use only as a blowing agent adjuvant in polystyrene at a level not to exceed 0.35 percent by weight of finished foamed polystyrene.