[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR177.1590]
[Page 305-306]
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
SERVICES (CONTINUED)
PART 177 INDIRECT FOOD ADDITIVES: POLYMERS--Table of Contents
Subpart B Substances for Use as Basic Components of Single and Repeated
Use Food Contact Surfaces
Sec. 177.1590 Polyester elastomers.
The polyester elastomers identified in paragraph (a) of this section
may be safely used as the food-contact surface of articles intended for
use in contact with bulk quantities of dry food of the type identified
in Sec. 176.170(c) of this chapter, table 1, under Type VIII, in
accordance with the following prescribed conditions:
(a) For the purpose of this section, polyester elastomers are those
produced by the ester exchange reaction when one or more of the
following phthalates--dimethyl terephthalate, dimethyl orthophthalate,
and dimethyl isophthalate--is made to react with alpha-hydroomega-
hydroxypoly (oxytetramethylene) and/or 1,4-
[[Page 306]]
butanediol such that the finished elastomer has a number average
molecular weight between 20,000 and 30,000.
(b) Optional adjuvant substances employed in the production of the
polyester elastomers or added thereto to impart desired technical or
physical properties may include the following substances:
------------------------------------------------------------------------
List of substances Limitations
------------------------------------------------------------------------
4,4' - Bis (alpha, alpha-dimethyl-benzyl) For use only as an
diphenylamine. antioxidant.
Tetrabutyl titanate....................... For use only as a catalyst.
------------------------------------------------------------------------
(c) An appropriate sample of the finished polyester elastomer in the
form in which it contacts food when subjected to ASTM method D968-81,
``Standard Test Methods for Abrasion Resistance of Organic Coatings by
the Falling Abrasive Tester,'' which is incorporated by reference
(Copies may be obtained from the American Society for Testing Materials,
100 Barr Harbor Dr., West Conshohocken, Philadelphia, PA 19428-2959, or
may be examined at the National Archives and Records Administration
(NARA). For information on the availability of this material at NARA,
call 202-741-6030, or go to: http://www.archives.gov/federal--register/
code--of--federal--regulations/ibr--locations.html.), using No. 50 emery
abrasive in lieu of Ottawa sand, shall exhibit an abrasion coefficient
of not less than 100 liters per mil of thickness.
[42 FR 14572, Mar. 15, 1977, as amended at 49 FR 10109, Mar. 19, 1984]
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