{"data":{"id":"us/21-cfr-177.1650","jurisdiction":"us","citation":"21 CFR 177.1650","heading":"Polysulfide polymer-polyepoxy resins.","body":"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:\n(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:\n(1) Substances generally recognized as safe in food and food packaging.\n(2) Substances the use of which is permitted under applicable regulations in this part, prior sanctions, or approvals.\n(3) Substances named in this subparagraph and further identified as required:\nList of substances Limitations\nBis(2-chloroethyl) formal\nBis(dichloropropyl) formal Cross-linking agent.\nButyl alcohol Solvent.\nCarbon black (channel process)\nChlorinated paraffins Cross-linking agent.\nEpoxidized linseed oil\nEpoxidized soybean oil\nEpoxy resins (as listed in § 175.300(b)(3)(viii)(a) of this chapter).\nEthylene glycol monobutyl ether Solvent.\nMagnesium chloride\nMethyl isobutyl ketone Solvent.\nNaphthalene sulfonic acid-formaldehyde condensate, sodium salt\nSodium dibutyl naphthalene sulfonate Wetting agent.\nSodium hydrosulfide\nSodium polysulfide\nβ,β′,γ,γ′-Tetrachloro normal propyl ether Cross-linking agent.\nTitanium dioxide\nToluene Solvent.\nTrichloroethane Cross-linking agent.\n1,2,3-Trichloropropane Do.\nUrea-formaldehyde resins\nXylene Solvent.\n(b) The resins are used as the food-contact surface for dry food.\n(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.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER B—FOOD FOR HUMAN CONSUMPTION","PART 177—INDIRECT FOOD ADDITIVES: POLYMERS","Subpart B—Substances for Use as Basic Components of Single and Repeated Use Food Contact Surfaces"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"2a3d382785600e2f20636d39e3f8f72a3015238454744935829e4d4d43d87389","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-177.1640","next":"us/21-cfr-177.1655"},"notice":"GroundRules: Original legal text. Not legal advice."}