[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR177.1650]

[Page 314-315]
 
                        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 315]]


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, 1916 Race St., 
Philadelphia, PA 19103, 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]