§178.3010 用于生产泡沫塑料的辅料(Adjuvant substances used in the manufacture of foamed plastics)

       §178.3010 Adjuvant substances used in the manufacture of foamed plastics
　　 

       The following substances may be safely used as adjuvants in the manufacture of foamed plastics intended for use in contact with food, subject to any prescribed limitations:

List of substances	Limitations
Azodicarbonamide	For use as a blowing agent in pol-yethylene 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.

[47 FR 22090, May 21, 1982, as amended at 58 FR 64895, Dec. 10, 1993]

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