[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: 21CFR177.1556]
[Page 301-302]
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. 177.1556 Polyaryletherketone resins.
The poly(oxy.1,4-phenylenecarbonyl.1,4-phenyleneoxy.1,4-
phenylenecarbonyl.1,4-phenylenecarbonyl.1,4-phenylene) resins (CAS Reg.
No. 55088-54-5 and CAS Reg. No. 60015-05-6 and commonly referred to as
polyaryletherketone resins) identified in paragraph (a) of this section
may be safely used as articles or components of articles intended for
repeated use in contact with food, subject to the provisions of this
section.
(a) Identity. Polyaryletherketone resins consist of basic resins
produced by reacting 4,4'-diphenoxy benzophenone and terephthaloyl
dichloride in such a way that the finished resins have a minimum weight
average molecular weight of 20,000 grams per mole, as determined by
light scattering measurements in sulfuric acid at room temperature.
(b) Optional adjuvant substances. The basic polyaryletherketone
resins identified in paragraph (a) of this section may contain optional
adjuvant substances required in the production of such basic resins.
These adjuvants may include substances used in accordance with Sec.
174.5 of this chapter and the following:
(1) Benzoyl chloride, poly(tetrafluoro ethylene).
(2) [Reserved]
(c) Extractive limitations. The finished food-contact article yields
net total extractives in each extracting solvent not to exceed 0.052
milligram per square inch (corresponding to 0.008 milligram per square
centimeter) of food-contact surface, when extracted at reflux
temperature for 2 hours with the following solvents: Distilled water, 50
percent (by volume) ethyl alcohol in
[[Page 302]]
distilled water, 3 percent acetic acid (by weight) in distilled water,
and n-heptane.
(d) In testing the finished food-contact article made of
polyaryletherketone resin, use a separate test sample for each required
extracting solvent.
[61 FR 42381, Aug. 15, 1996]
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