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177.1020 Acrylonitrile/butadiene/sty&chyph;rene co-polymer.

Home > Regulations > Indirect food additives: Polymers > 177.1020 Acrylonitrile/butadiene/sty&chyph;rene co-polymer.



[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR177.1020]

[Page 240-241]
 
                        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.  177.1020  Acrylonitrile/butadiene/sty rene co-polymer.

    Acrylonitrile/butadiene/styrene copolymer identified in this section 
may be safely used as an article or component of articles intended for 
use with

[[Page 241]]

all foods, except those containing alcohol, under conditions of use E, 
F, and G described in table 2 of Sec.  176.170(c) of this chapter.
    (a) Identity. For the purpose of this section, the acrylonitrile/
butadiene/styrene copolymer consists of:
    (1) Eighty-four to eighty-nine parts by weight of a matrix polymer 
containing 73 to 78 parts by weight of acrylonitrile and 22 to 27 parts 
by weight of styrene; and
    (2) Eleven to sixteen parts by weight of a grafted rubber consisting 
of (i) 8 to 13 parts of butadiene/styrene elastomer containing 72 to 77 
parts by weight of butadiene and 23 to 28 parts by weight of styrene and 
(ii) 3 to 8 parts by weight of a graft polymer having the same 
composition range as the matrix polymer.
    (b) Adjuvants. The copolymer identified in paragraph (a) of this 
section may contain adjuvant substances required in its production. Such 
adjuvants may include substances generally recognized as safe in food, 
substances used in accordance with prior sanction, substances permitted 
in this part, and the following:

------------------------------------------------------------------------
                 Substance                           Limitations
------------------------------------------------------------------------
2-Mercapto- ethanol.......................  The finished copolymer shall
                                             contain not more than 100
                                             ppm 2-mercaptoethanol
                                             acrylonitrile adduct as
                                             determined by a method
                                             titled ``Analysis of
                                             Cycopac Resin for Residual
                                             [beta]-(2-
                                             Hydroxyethylmercapto)
                                             propionitrile,'' which is
                                             incorporated by reference.
                                             Copies are available from
                                             the Bureau of Foods (HFS-
                                             200), Food and Drug
                                             Administration, 5100 Paint
                                             Branch Pkwy., College Park,
                                             MD 20740, or available for
                                             inspection 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.
------------------------------------------------------------------------

    (c) Specifications. (1) Nitrogen content of the copolymer is in the 
range of 16 to 18.5 percent as determined by Micro-Kjeldahl analysis.
    (2) Residual acrylonitrile monomer content of the finished copolymer 
articles is not more than 11 parts per million as determined by a gas 
chromatographic method titled ``Determination of Residual Acrylonitrile 
and Styrene Monomers-Gas Chromatographic Internal Standard Method,'' 
which is incorporated by reference. Copies are available from the Center 
for Food Safety and Applied Nutrition (HFS-200), Food and Drug 
Administration, 5100 Paint Branch Pkwy., College Park, MD 20740, or 
available for inspection 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.
    (d) Extractive limitations. (1) Total nonvolatile extractives not to 
exceed 0.0005 milligram per square inch surface area when the finished 
food contact article is exposed to distilled water, 3 percent acetic 
acid, or n-heptane for 8 days at 120 [deg]F.
    (2) The finished food-contact article shall yield not more than 
0.0015 milligram per square inch of acrylonitrile monomer when exposed 
to distilled water and 3 percent acetic acid at 150 [deg]F for 15 days 
when analyzed by a polarographic method titled ``Extracted Acrylonitrile 
by Differential Pulse Polarography,'' which is incorporated by 
reference. Copies are available from the Center for Food Safety and 
Applied Nutrition (HFS-200), Food and Drug Administration, 5100 Paint 
Branch Pkwy., College Park, MD 20740, or available for inspection 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.
    (e) Acrylonitrile copolymers identified in this section shall comply 
with the provisions of Sec.  180.22 of this chapter.
    (f) Acrylonitrile copolymers identified in this section are not 
authorized to be used to fabricate beverage containers.

[42 FR 14572, Mar. 15, 1977, as amended at 42 FR 48543, Sept. 23, 1977; 
47 FR 11841, Mar. 19, 1982; 54 FR 24897, June 12, 1989]

[[Page 242]]





Additives that reference this regulation:


Source: U.S. Code of Federal Regulations - CFR Title 21, Part 177, Section 1020


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