[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: 21CFR177.1960]
[Page 326-327]
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. 177.1960 Vinyl chloride-hexene.1 copolymers.
The vinyl chloride-hexene.1 copolymers identified in paragraph (a)
of this section or as components of articles intended for use in contact
with food, under conditions of use D, E, F, or G described in table 2 of
Sec. 176.170(c) of this chapter, subject to the provisions of this
section.
(a) Identity. For the purposes of this section vinyl chloride-
hexene.1 copolymers consist of basic copolymers produced by the
copolymerization of vinyl chloride and hexene.1 such that the finished
copolymers contain not more than 3 mole-percent of polymer units derived
from hexene.1 and meet the specifications and extractives limitations
prescribed in paragraph (b) of this section. The copolymers may
optionally contain hydroxypropyl methyl cellulose and trichloroethylene
used as a suspending agent and chain transfer agent, respectively, in
their production.
(b) Specifications and limitations. The vinyl chloride-hexene.1
basic copolymers meet the following specifications and extractives
limitations:
(1) Specifications. (i) Total chlorine content is 53 to 56 percent
as determined by any suitable analytical procedure of generally accepted
applicability.
(ii) Inherent viscosity in cyclohexanone at 30 [deg]C is not less
than 0.59 deciliters 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.
(2) Extractives limitations. The following extractives limitations
are determined by the methods prescribed in Sec. 177.1970(d).
(i) Total extractives do not exceed 0.01 weight percent when
extracted with water at 150 [deg]F for 2 hours.
(ii) Total extractives do not exceed 0.30 weight percent when
extracted with n-heptane at 150 [deg]F for 2 hours.
(c) Other specifications and limitations. The vinyl chloride-hexene-
1 copolymers identified in and complying with this section, when used as
components of the food-contact surface of any article that is subject to
a regulation in parts 174, 175, 176, 177, 178 and Sec. 179.45 of this
chapter, shall comply with any
[[Page 327]]
specifications and limitations prescribed by such regulation for the
article in the finished form in which it is to contact food.
[42 FR 14572, Mar. 15, 1977, as amended at 49 FR 10110, Mar. 19, 1984]
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