[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: 21CFR175.270]
[Page 172]
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
SERVICES (CONTINUED)
PART 175 INDIRECT FOOD ADDITIVES: ADHESIVES AND COMPONENTS OF
Subpart C Substances for Use as Components of Coatings
Sec. 175.270 Poly(vinyl fluoride) resins.
Poly(vinyl fluoride) resins identified in this section may be safely
used as components of food-contact coatings for containers having a
capacity of not less than 5 gallons, subject to the provisions of this
section.
(a) For the purpose of this section, poly(vinyl fluoride) resins
consist of basic resins produced by the polymerization of vinyl
fluoride.
(b) The poly(vinyl fluoride) basic resins have an intrinsic
viscosity of not less than 0.75 deciliter per gram as determined by ASTM
method D1243-79, ``Standard Test Method for Dilute Solution Viscosity of
Vinyl Chloride Polymers,'' 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.
(1) Solvent. N,N-Dimethylacetamide, technical grade.
(2) Solution. Powdered resin and solvent are heated at 120 [deg]C
until the resin is dissolved.
(3) Temperature. Flow times of the solvent and solution are
determined at 110 [deg]C.
(4) Viscometer. Cannon-Ubbelohde size 50 semimicro dilution
viscometer (or equivalent).
(5) Calculation. The calculation method used is that described in
appendix X 1.3 (ASTM method D1243-79, ``Standard Test Method for Dilute
Solution Viscosity of Vinyl Chloride Polymers,'' which is incorporated
by reference; see paragraph (b) of this section for availability of the
incorporation by reference) with the reduced viscosity determined for
three concentration levels not greater than 0.5 gram per deciliter and
extrapolated to zero concentration for intrinsic viscosity. The
following formula is used for determining reduced viscosity:
[GRAPHIC] [TIFF OMITTED] TR01JA93.387
where:
t=Solution efflux time.
to=Solvent efflux time.
c=Concentration of solution in terms of grams per deciliter.
[42 FR 14534, Mar. 15, 1977, as amended at 47 FR 11839, Mar. 19, 1982;
49 FR 10107, Mar. 19, 1984]
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