[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: 21CFR177.1556]

[Page 286]
 
                        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 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]