[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
PART 177_INDIRECT FOOD ADDITIVES: POLYMERS--Table of Contents
Subpart C_Substances for Use Only as Components of Articles Intended for
Sec. 177.2710 Styrene-divinylbenzene resins, cross-linked.
Styrene-divinylbenzene cross-linked copolymer resins may be safely
used as articles or components of articles intended for repeated use in
producing, manufacturing, packing, processing, preparing, treating,
packaging, transporting, or holding food, in accordance with the
following prescribed conditions:
(a) The resins are produced by the copolymerization of styrene with
(b) The resins meet the extractives limitations prescribed in this
(1) The resins to be tested are ground or cut into small particles
that will pass through a U.S. standard sieve No. 3 and that will be held
on a U.S. standard sieve No. 20.
(2) A 100-gram sample of the resins, when extracted with 100
milliliters of ethyl acetate at reflux temperature for 1 hour, yields
total extractives not to exceed 1 percent by weight of the resins.
(c) In accordance with good manufacturing practice, finished
articles containing the resins shall be thoroughly cleansed prior to
their first use in contact with food.
Additives that reference this regulation: