[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: 21CFR177.1650]
[Page 315-316]
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. 177.1650 Polysulfide polymer-polyepoxy resins.
Polysulfide polymer-polyepoxy res- ins may be safely used as the
food-contact surface of articles intended for packaging, transporting,
holding, or otherwise contacting dry food, in accordance with the
following prescribed conditions:
(a) Polysulfide polymer-polyepoxy resins are the reaction products
of liquid polysulfide polymers and polyfunctional epoxide resins, cured
with the aid of tri(dimethylaminomethyl) phenol, to which have been
added certain optional substances to impart desired technological
properties to the resins. Subject to any limitations prescribed in this
section, the optional substances may include:
(1) Substances generally recognized as safe in food and food
packaging.
(2) Substances the use of which is permitted under applicable
regulations in this part, prior sanctions, or approvals.
(3) Substances named in this subparagraph and further identified as
required:
------------------------------------------------------------------------
List of substances Limitations
------------------------------------------------------------------------
Bis(2-chloroethyl) formal..............
Bis(dichloropropyl) formal............. Cross-linking agent.
Butyl alcohol.......................... Solvent.
Carbon black (channel process).........
Chlorinated paraffins.................. Cross-linking agent.
Epoxidized linseed oil.................
Epoxidized soybean oil.................
Epoxy resins (as listed in Sec.
175.300(b)(3)(viii)(a) of this
chapter)..
Ethylene glycol monobutyl ether........ Solvent.
Magnesium chloride.....................
Methyl isobutyl ketone................. Solvent.
Naphthalene sulfonic acid-formaldehyde
condensate, sodium salt.
[[Page 316]]
Sodium dibutyl naphthalene sulfonate... Wetting agent.
Sodium hydrosulfide....................
Sodium polysulfide.....................
[beta],[beta]',[gamma],[gamma]'- Cross-linking agent.
Tetrachloro normal propyl ether.
Titanium dioxide.......................
Toluene................................ Solvent.
Trichloroethane........................ Cross-linking agent.
1,2,3-Trichloropropane................. Do.
Urea-formaldehyde resins...............
Xylene................................. Solvent.
------------------------------------------------------------------------
(b) The resins are used as the food-contact surface for dry food.
(c) An appropriate sample of the finished resin in the form in which
it contacts food, when subjected to ASTM method D968-81, ``Standard Test
Methods for Abrasion Resistance of Organic Coatings by the Falling
Abrasive Tester,'' 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.), using No. 50 Emery abrasive
in lieu of Ottawa sand, shall exhibit and abrasion coefficient of not
less than 20 liters per mil of film thickness.
[42 FR 14572, Mar. 15, 1977, as amended at 49 FR 10110, Mar. 19, 1984]
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