[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR178.3010]

[Page 380]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 178--INDIRECT FOOD ADDITIVES: ADJUVANTS, PRODUCTION AIDS, AND SANITIZERS--Table of Contents
 
            Subpart D--Certain Adjuvants and Production Aids
 
Sec. 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
                                         polyethylene complying with
                                         item 2.1 in Sec.  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-  For use as a blowing agent in
 6).                                     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 Sec.
                                         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]