Food and Drug Administration, HHS § 177.2600

(2) Reverse osmosis membranes de- tion in parts 174, 175, 176, 177, 178 and scribed in paragraph (a)(4) of this sec- § 179.45 of this chapter conforms with tion may be used in contact with all any specification in such regulation. types of liquid food, except food con- (i) Elastomers. taining more than 8 percent alcohol, at Acrylonitrile-butadiene copolymer. temperatures up to 80 °C (176 °F). Brominated isobutylene-isoprene copolymers (3) Reverse osmosis membranes shall complying with § 177.1210. be maintained in a sanitary manner in Butadiene-acrylonitrile-ethylene glycol accordance with current good manufac- dimethacrylate copolymers containing not turing practice so as to prevent micro- more than 5 weight percent of polymer bial adulteration of food. units derived from ethylene glycol dimethacrylate. (4) To assure their safe use, reverse Butadiene-acrylonitrile-methacrylic acid co- osmosis membranes and their supports polymer. shall be thoroughly cleaned prior to Butadiene-styrene-methacrylic acid copoly- their first use in accordance with cur- mer. rent good manufacturing practice. Chloroprene polymers. Chlorotrifluoroethylene-vinylidene fluoride [49 FR 49448, Dec. 20, 1984, as amended at 52 copolymer. FR 29668, Aug. 11, 1987; 53 FR 31835, Aug. 22, Ethylene-propylene copolymer elastomers 1988; 53 FR 32215, Aug. 24, 1988; 55 FR 8139, which may contain not more than 5 Mar. 7, 1990; 59 FR 9925, Mar. 2, 1994] weight-percent of total polymer units de- rived from 5-methylene-2-norbornene and/ § 177.2600 Rubber articles intended for or 5-ethylidine-2-norbornene. repeated use. Ethylene-propylene-dicyclopentadiene co- Rubber articles intended for repeated polymer. use may be safely used in producing, Ethylene-propylene-1,4-hexadiene copoly- mers containing no more than 8 weight manufacturing, packing, processing, percent of total polymer units derived preparing, treating, packaging, trans- from 1,4-hexadiene. porting, or holding food, subject to the Hydrogenated butadiene/acrylonitrile co- provisions of this section. polymers (CAS Reg. No. 88254–10–8) pro- (a) The rubber articles are prepared duced when acrylonitrile/butadiene copoly- from natural and/or synthetic polymers mers are modified by hydrogenation of the and adjuvant substances as described olefinic unsaturation to leave either: (1) Not more than 10 percent trans olefinic in paragraph (c) of this section. unsaturation and no a, b-olefinic (b) The quantity of any substance unsaturation as determined by a method employed in the production of rubber entitled ‘‘Determination of Residual a, b- articles intended for repeated use shall Olefinic and Trans Olefinic Unsaturation not exceed the amount reasonably re- Levels in HNBR,’’ developed October 1, quired to accomplish the intended ef- 1991, by Polysar Rubber Corp., 1256 South fect in the rubber article and shall not Vidal St., Sarnia, Ontario, Canada N7T 7MI; or (2) 0.4 percent to 20 percent olefinic be intended to accomplish any effect in unsaturation and Mooney viscosities great- food. er than 45 (ML 1 + 4 @ 100 °C), as deter- (c) Substances employed in the prep- mined by ASTM Standard Method D1646– aration of rubber articles include the 92, ‘‘Standard Test Method for Rubber— following, subject to any limitations Viscosity and Vulcanization Characteris- prescribed: tics (Mooney Viscometer),’’ which are both (1) Substances generally recognized incorporated by reference in accordance as safe for use in food or food pack- with 5 U.S.C. 552(a) and 1 CFR part 51. Cop- ies of these methods may be obtained from aging. the Division of Petition Control (HFS–215), (2) Substances used in accordance Center for Food Safety and Applied Nutri- with the provisions of a prior sanction tion, Food and Drug Administration, 5100 or approval. Paint Branch Pkwy., College Park, MD (3) Substances that by regulation in 20740, or may be examined at the Center for parts 170 through 189 of this chapter Food Safety and Applied Nutrition’s Li- may be safely used in rubber articles, brary, 5100 Paint Branch Pkwy., College subject to the provisions of such regu- Park, MD 20740, or at the National Ar- chives and Records Administration lation. (NARA). For information on the avail- (4) Substances identified in this para- ability of this material at NARA, call 202– graph (c)(4), provided that any sub- 741–6030, or go to: http://www.archives.gov/ stance that is the subject of a regula- federallregister/

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codeloflfederallregulations/ Silicone (Fsi) elastomers containing meth- ibrllocations.html. A copy of ASTM Stand- yl and fluorine groups. ard Method D1646–92 may also be obtained Silicone (PVsi) elastomers containing from the American Society for Testing and phenyl, methyl, and vinyl groups. Materials, 100 Barr Harbor Dr., West Styrene-butadiene copolymer. Conshohocken, PA 19428–2959. Vinylidene fluoride-hexafluoropropylene co- Isobutylene-isoprene copolymer. polymers (minimum number average mo- Polyamide/polyether block copolymers (CAS lecular weight 70,000 as determined by os- Reg. No. 77402–38–1 prepared by reacting a motic pressure in methyl ethyl ketone). copolymer of omega-laurolactam and adipic Vinylidene fluoride-hexafluoropropylene- acid with poly(tetramethylene ether gly- tetrafluoroethylene copolymers (minimum col). The polyamide and polyether compo- number average molecular weight 100,000 nents are reacted in ratios such that the as determined by osmotic pressure in polyamide component constitutes a min- methyl ethyl ketone). imum of 30 weight-percent of total polymer units. The copolymers may be used in con- (ii) Vulcanization materials—(a) Vul- tact with foods of Types I, II, III, IV, V, VI, canizing agents. VII, VIII, and IX identified in table 1 of ′ § 176.170(c) of this chapter at temperatures 4,4 -Bis(aminocyclohexyl)methane carbamate not to exceed 150 °F except that those co- for use only as cross-linking agent in the polymers prepared with less than 50 vulcanization of vinylidene weight-percent of polyamide are limited to fluoridehexafluoropropylene copolymer use in contact with such foods at tempera- and vinylidene fluoride- tures not to exceed 100 °F. hexafluoropropylene-tetrafluoroethylene Polybutadiene. copolymer elastomers identified under Polyester elastomers derived from the reac- paragraph (c)(4)(i) of this section and lim- tion of dimethyl terephthalate, 1,4- ited to use at levels not to exceed 2.4 per- butanediol, and a-hydro-omega- cent by weight of such copolymers. hydroxypoly (oxytetramethylene). Addi- Diisopropyl xanthogen polysulfide (a 1:2:1 tionally, trimethyl trimellitate may be mixture of O,O-di(1-methylethyl)trithio- used as a reactant. The polyester bis-thioformate, O,O-di(1- elastomers may be used only in contact methylethyl)tetrathio-bis-thioformate, with foods containing not more than 8 per- and O,O-di(1-methylethyl)pentathio-bis- cent alcohol and limited to use in contact thioformate) for use as a cross linking with food at temperatures not exceeding agent in the vulcanization of natural rub- 150 °F. ber, styrene-butadiene copolymer, acrylo- Polyisoprene. nitrile-butadiene copolymer, and ethylene- Polyurethane resins (CAS Reg. Nos. 37383–28– propylene terpolymers identified under 1 or 9018–04–6) derived from the reaction of paragraph (c)(4)(i) of this section and lim- diphenylmethane diisocyanate with 1,4- ited to use at levels not to exceed 2.4 per- butanediol and polytetramethylene ether cent by weight of such copolymers. glycol. Hexamethylenediamine carbamate for use Polyurethane resins derived from reactions only as cross-linking agent in the vul- of diphenylmethane diisocyanate with canization of vinylidene fluoride- adipic acid and 1,4-butanediol. hexafluoropropylene copolymer and vinyli- Rubber, natural. dene fluoride-hexafluoropropylene-tetra- Silicone basic polymer as described in ASTM fluoroethylene copolymer elastomers iden- method D1418–81, ‘‘Standard Practice for tified under paragraph (c)(4)(i) of this sec- Rubber and Rubber Latices—Nomen- tion and limited to use at levels not to ex- clature,’’ which is incorporated by ref- ceed 1.5 percent by weight of such copoly- erence. Copies may be obtained from the mers. American Society for Testing Materials, Sulfur, ground. 100 Barr Harbor Dr., West Conshohocken, Philadelphia, PA 19428-2959, or may be ex- (b) Accelerators (total not to exceed 1.5 amined at the National Archives and percent by weight of rubber product). Records Administration (NARA). For in- 2-Benzothiazyl-N,N-diethylthiocarbamyl-sul- formation on the availability of this mate- fide. rial at NARA, call 202–741–6030, or go to: Benzoyl peroxide. http://www.archives.gov/federallregister/ 1,3-Bis(2-benzothiazolylmercaptomethyl) codeloflfederallregulations/ urea. ibrllocations.html. N-tert-Butyl-2-benzothiazole sulfenamide. Silicone (Si) elastomers containing methyl Butyraldehyde-aniline resin (iodine number groups. 670–705). Silicone (Psi) elastomers containing meth- Carbon disulfide-1,1′-methylenedipiperidine yl and phenyl groups. reaction product. Silicone (Vsi) elastomers containing meth- Copper dimethyldithiocarbamate. yl and vinyl groups. N-Cyclohexyl-2-benzothiazole sulfenamide.

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Dibenzoyl-p-quinone dioxime. (c) Retarders (total not to exceed 10 per- Dibenzylamine. cent of weight of rubber product). Diisopropyl xanthogen polysulfide (a 1:2:1 mixture of O,O-di(1-methylethyl)trithio- Cyanoguanidine. bis-thioformate, O,O-di(1- Phthalic anhydride. methylethyl)tetrathio-bis-thioformate, Salicylic acid. and O,O-di(1-methylethyl)pentathio-bis- thioformate). (d) Activators (total not to exceed 5 per- Di(4-methylbenzoyl) peroxide (CAS Reg. No. cent by weight of rubber product except 895–85–2) for use only as a crosslinking magnesium oxide may be used at higher agent in silicone polymers and elastomers levels). identified under paragraph (c)(4)(i) of this section at levels not to exceed 1 percent by Diethylamine. weight of such polymers and elastomers Fatty acid amines, mixed. where the total of all accelerators does not Fatty acids. exceed 1.5 percent by weight of rubber Magnesium carbonate. product. Magnesium oxide, light and heavy. Di-tert-butyl peroxide. Oleic acid, dibutylamine salt (dibutylammo- Dibutyl xanthogen disulfide. nium oleate). 2,4-Dichlorobenzoyl peroxide. Stannous chloride. Dicumyl peroxide. Tall oil fatty acids. N,N-Dimethylcyclohexylamine salt of dibu- Tetrachloro-p-benzoquinone. tyldithiocarbamic acid. Triethanolamine. 2,6-Dimethylmorpholine thiobenzothiazol. Zinc salts of fatty acids. Dipentamethylenethiuram hexasulfide (CAS (iii) Antioxidants and antiozonants Reg. No. 971–15–3). Diphenylguanidine. (total not to exceed 5 percent by weight of Diphenylguanidine phthalate. rubber product). 1,3-Diphenyl-2-thiourea. Aldol-a-naphthylamine. 2,2′-Dithiobis[benzothiazole]. Alkylated (C and/or C ) phenols. 4,4′-Dithiodimorpholine. 4 8 BHT (butylated hydroxytoluene). N,N′-Di-o-tolylguanidine. 4-[[4,6-bis(octylthio)-s-triazin-2-yl]amino]- Di-o-tolylguanidine salt of pyrocatecholbo- 2,6-di-tert-butylphenol (CAS Reg. No. 991– rate. 84–4) for use only as a stabilizer at levels Ethylenediamine carbamate. not to exceed 0.5 percent by weight of the Heptaldehyde-aniline resin (iodine number finished rubber product. 430–445). Hexamethylenetetramine. Butylated reaction product of p-cresol and 2-Mercaptobenzothiazole. dicyclopentadiene as identified in 2-Mercaptothiazoline. § 178.2010(b) of this chapter. N-Oxydiethylene-benzothiazole-2- Butylated, styrenated cresols identified in sulfenamide. § 178.2010(b) of this chapter. ′ Piperidinium pentamethylenedithiocarba- 4,4 -Butylidinebis(6-tert-butyl-m-cresol). ′ mate. N-Cyclohexyl-N -phenylphenylenediamine. Potassium pentamethylenedithiocarbamate. p,p′-Diaminodiphenylmethane. p-Quinone dioxime. 2,5-Di-tert-amylhydroquinone. Sodium dibutyldithiocarbamate. Diaryl-p-phenylenediamine, where the aryl Sodium dimethyldithiocarbamate. group may be phenyl, tolyl, or xylyl. Stannous oleate for use only as an accel- 2,6-Di-tert-butyl-p-phenylphenol. erator for silicone elastomers. 1,2-Dihydro-2,2,4-trimethyl-6- Tetrabutylthiuram monosulfide. dodecylquinoline. Tetraethylthiuram disulfide. 1,2-Dihydro-2,2,4-trimethyl-6- (1,1,4,4-Tetramethyltetramethylene)bis [tert- ethoxyquinoline. butyl peroxide]. 1,2-Dihydro-2,2,4-trimethyl-6- Tetramethylthiuram monosulfide. phenylquinoline. Thiram (tetramethylthiuram disulfide). 4,4′-Dimethoxydiphenylamine. Triallyl cyanurate. 4,6-Dinonyl-o-cresol. Triethylenetetramine. N,N′-Dioctyl-p-phenylenediamine. 1,3,5-Triethyl-hexahydro-s-triazine Diphenylamine-acetone resin. (triethyltrimethylenetriamine). Diphenylamine-acetone-formaldehyde resin. Triphenylguanidine. N,N′-Diphenylethylenediamine. Zinc butyl xanathate. N,N′-Disalicylalpropylenediamine. Zinc dibenzyl dithiocarbamate. N,N′-Di-o-tolylethylenediamine. Zinc dibutyldithiocarbamate. Hydroquinone monobenzyl ether. Zinc diethyldithiocarbamate. Isopropoxydiphenylamine. Zinc 2-mercaptobenzothiazole. N-Isopropyl-N′-phenyl-p-phenylenediamine. Ziram (zinc dimethyldithiocarbamate). 2,2′-Methylenebis(6-tert-butyl-4-ethylphenol).

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2,2′-Methylenebis(4-methyl-6-tert-butyl- Diisooctyl sebacate. phenol). Dioctyl adipate. 2,2′-Methylenebis(4-methyl-6-nonylphenol). Dioctyl phthalate. 2,2′-Methylenebis(4-methyl-6-tert- Dioctyl sebacate. octylphenol). Dipentene resin. Monooctyl- and dioctyldiphenylamine. Diphenyl ketone. N,N′-Di-b-naphthyl-p-phenylenediamine. Fatty acids. Phenyl-a-naphthylamine. Fatty acids, hydrogenated. Phenyl-b-naphthylamine. Isooctyl ester of tall oil fatty acids. Phenyl-b-naphthylamine-acetone aromatic Lanolin. amine resin (average molecular weight 600; a-Methylstyrene-vinyltoluene copolymer nitrogen content 5.3 percent). resins (molar ratio 1 a-methylstyrene to 3 o- and p-Phenylphenol. vinyltoluene). Polybutylated (mixture) 4,4′- Mineral oil; (1) In rubber articles complying isopropylidenediphenol. with this section, not to exceed 30 percent Sodium pentachlorophenate. by weight; (2) Alone or in combination Styrenated cresols produced when 2 moles of with waxes, petroleum, total not to exceed styrene are made to react with 1 mole of a 45 percent by weight of rubber articles that mixture of phenol and o-, m-, and p-cresols contain at least 20 percent by weight of so that the final product has a Brookfield ethylene-propylene copolymer elastomer viscosity at 25 °C of 1400 to 1700 centipoises. complying with paragraph (c)(4)(i) of this Styrenated phenol. section, in contact with foods of Types I, 4,4′-Thiobis (6-tert-butyl-m-cresol). II, III, IV, VI, VII, VIII, and IX idenified in Toluene-2,4-diamine. table 1 of § 176.170(c) of this chapter. N-o-Tolyl-N′-phenyl-p-phenylenediamine. Montan wax. p(p-Tolylsufanilamide) diphenylamine. n-Octyl n-decyl adipate. Tri(mixed mono- and dinonylphenyl) n-Octyl n-decyl phthalate. phosphite. Petrolatum. Tri(nonylphenyl) phosphite-formaldehyde Petroleum hydrocarbon resin resins produced when 1 mole of (cyclopentadiene type), hydrogenated. tri(nonylphenyl) phosphite is made to Petroleum hydrocarbon resin (produced by react with 1.4 moles of formaldehyde or the homo- and copolymerization of dienes produced when 1 mole of nonylphenol is and olefins of the aliphatic, alicyclic, and made to react with 0.36 mole of formalde- monobenzenoid arylalkene types from dis- hyde and the reaction product is then fur- tillates of cracked petroleum stocks). ther reacted with 0.33 mole of phosphorus Petroleum hydrocarbon resin (produced by trichloride. The finished resins have a min- the catalytic polymerization and subse- imum viscosity of 20,000 centipoises at 25 quent hydrogenation of styrene, °C, as determined by LV-series Brookfield vinyltoluene, and indene types from dis- viscometer (or equivalent) using a No. 4 tillates of cracked petroleum stocks). spindle at 12 r.p.m., and have an organic Petroleum oil, sulfonated. phosphorus content of 4.05 to 4.15 percent Phenol-formaldehyde resin. by weight. Pine tar. Polybutene. (iv) Plasticizers (total not to exceed 30 Polystyrene. percent by weight of rubber product un- Propylene glycol. less otherwise specified). n-Propyl ester of tall oil fatty acids. Rapeseed oil vulcanized with rubber maker’s n-Amyl n-decyl phthalate. sulfur. Butylacetyl ricinoleate. Rosins and rosin derivatives identified in n-Butyl ester of tall oil fatty acids. § 175.105(c)(5) of this chapter. Butyl laurate. Soybean oil vulcanized with rubber maker’s Butyl oleate. sulfur. Butyl stearate. Styrene-acrylonitrile copolymer. Calcium stearate. Terpene resins. Castor oil. Triethylene glycol dicaprate. Coumarone-indene resins. Triethylene glycol dicaprylate. 2,2′-Dibenzamidodiphenyl disulfide. Waxes, petroleum. Dibenzyl adipate. Xylene (or toluene) alkylated with Dibutoxyethoxyethyl adipate. dicyclopentadiene. Dibutyl phthalate. Zinc 2-benzamidothiophenate. Dibutyl sebacate. (v) Fillers. Didecyl adipate. Didecyl phthalate. Aluminum hydroxide. Diisodecyl adipate. Aluminum silicate. Diisodecyl phthalate. Asbestos fiber, chrysotile or crocidolite. Diisooctyl adipate. Barium sulfate.

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Carbon black (channel process or furnace levels not to exceed 0.3 percent by weight combustion process; total carbon black not of the sealants and caulking materials. to exceed 50 percent by weight of rubber Dodecyl mercaptan isomers, single or mixed. product; furnace combustion black content 2-Ethoxyethanol. not to exceed 10 percent by weight of rub- Iodoform. ber products intended for use in contact p-Menthane hydroperoxide. with milk or edible oils). a-(p-Nonylphenyl)-omega-hydroxypoly (oxy- Cork. ethylene) mixture of dihydrogen phosphate Cotton (floc, fibers, fabric). and monohydrogen phosphate esters, bar- Mica. ium salt; the nonyl group is a propylene Nylon (floc, fibers, fabric). trimer isomer and the poly (oxyethylene) Silica. content averages 9 moles; for use only as Titanium dioxide. residual polymerization emulsifier at lev- Zinc carbonate. els not to exceed 0.7 percent by weight of Zinc sulfide. ethylene-propylene-1,4-hexadiene copoly- (vi) Colorants. Colorants used in ac- mers identified under paragraph (c)(4)(i) of cordance with § 178.3297 of this chapter. this section. ′ (vii) Lubricants (total not to exceed 2 4,4 -Oxybis (benzenesulfonhydrazide) as chemical blowing agent. percent by weight of rubber product). Phenothiazine. Polyethylene. Potassium persulfate. Sodium stearate. Sodium formaldehyde sulfoxylate. Sodium polysulfide. (viii) Emulsifiers. Sodium nitrite. Fatty acid salts, sodium or potassium. Sodium salt of ethylenediamine tetraacetic Naphthalene sulfonic acid-formaldehyde con- acid and glycine. densate, sodium salt. Sodium sulfide. Rosins and rosin-derivatives identified in Styrene monomer. § 175.105(c)(5) of this chapter. Tall oil. Sodium decylbenzenesulfonate Thioxylenois as peptizing agents. Sodium dodecylbenzenesulfonate Tridecyl mercaptan. Sodium lauryl sulfate. Zinc 4-tert-butylthiophenate as peptizing Tall oil mixed soap (calcium, potassium, and agent. sodium). (d) Rubber articles intended for use (ix) Miscellaneous (total not to exceed 5 with dry food are so formulated and percent by weight of rubber product). cured under conditions of good manu- Animal glue as described in § 178.3120 of this facturing practice as to be suitable for chapter. repeated use. Azodicarbonamide as chemical blowing (e) Rubber articles intended for re- agent. peated use in contact with aqueous 2-Anthraquinone sulfonic acid sodium salt food shall meet the following specifica- for use only as polymerization inhibitor in tions: The food-contact surface of the chloroprene polymers and not to exceed rubber article in the finished form in 0.03 percent by weight of the chloroprene which it is to contact food, when ex- polymers. 1,2-Benzisothiazolin-3-one (CAS Reg. No. tracted with distilled water at reflux 2634–33–5) for use as a biocide in uncured temperature, shall yield total extrac- liquid rubber latex not to exceed 0.02 per- tives not to exceed 20 milligrams per cent by weight of the latex solids, where square inch during the first 7 hours of the total of all items listed in paragraph extraction, nor to exceed 1 milligram (c)(4)(ix) of this section does not exceed 5 per square inch during the succeeding 2 percent of the rubber product. hours of extraction. n-Butyllithium for use only as polymeriza- tion catalyst for polybutadiene. (f) Rubber articles intended for re- 4-tert-Butyl-o-thiocresol as peptizing agent. peated use in contact with fatty foods tert-Butyl peracetate. shall meet the following specifications: p-tert-Butylpyrocatechol. The food-contact surface of the rubber Dialkyl (C8–C18) dimethylammonium chlo- article in the finished form in which it ride for use only as a flocculating agent in is to contact food, when extracted with the manufacture of silica. n-hexane at reflux temperature, shall Di- and triethanolamine. Diethyl xanthogen disulfide. yield total extractives not to exceed 4-(Diiodomethylsulfonyl) toluene, Chemical 175 milligrams per square inch during Abstracts Service Registry No. 20018–09–01, the first 7 hours of extraction, nor to for use as an antifungal preservative at exceed 4 milligrams per square inch

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during the succeeding 2 hours of ex- taining the resins shall be thoroughly traction. cleansed prior to their first use in con- (g) In accordance with good manufac- tact with food. turing practice finished rubber articles intended for repeated use in contact § 177.2800 Textiles and textile fibers. with food shall be thoroughly cleansed Textiles and textile fibers may safely prior to their first use in contact with be used as articles or components of ar- food. ticles intended for use in producing, (h) The provisions of this section are manufacturing, packing, processing, not applicable to rubber nursing-bottle preparing, treating, packaging, trans- nipples. porting, or holding food, subject to the (i) Acrylonitrile copolymers identi- provisions of this section. fied in this section shall comply with (a) The textiles and textile fibers are the provisions of § 180.22 of this chap- prepared from one or more of the fibers ter. identified in paragraph (d) of this sec- [42 FR 14572, Mar. 15, 1977] tion and from certain other adjuvant substances required in the production EDITORIAL NOTE: For FEDERAL REGISTER ci- of the textiles or textile fibers or added tations affecting § 177.2600, see the List of CFR Sections Affected, which appears in the to impart desired properties. Finding Aids section of the printed volume (b) The quantity of any adjuvant sub- and at www.fdsys.gov. stance employed in the production of textiles or textile fibers does not ex- § 177.2710 Styrene-divinylbenzene res- ceed the amount reasonably required ins, cross-linked. to accomplish the intended physical or Styrene-divinylbenzene cross-linked technical effect or any limitation fur- copolymer resins may be safely used as ther provided. articles or components of articles in- (c) Any substance employed in the tended for repeated use in producing, production of textiles or textile fibers manufacturing, packing, processing, that is the subject of a regulation in preparing, treating, packaging, trans- parts 174, 175, 176, 177, 178 and § 179.45 of porting, or holding food, in accordance this chapter conforms with any speci- with the following prescribed condi- fication in such regulation. tions: (d) Substances employed in the pro- (a) The resins are produced by the co- duction of or added to textiles and tex- polymerization of styrene with tile fibers may include: divinylbenzene. (1) Substances generally recognized (b) The resins meet the extractives as safe in food. limitations prescribed in this para- (2) Substances subject to prior sanc- graph: tion or approval for use in textiles and (1) The resins to be tested are ground textile fibers and used in accordance or cut into small particles that will with such sanction or approval. pass through a U.S. standard sieve No. (3) Substances generally recognized 3 and that will be held on a U.S. stand- as safe for use in cotton and cotton fab- ard sieve No. 20. rics used in dry-food packaging. (2) A 100-gram sample of the resins, (4) Substances that by regulation in when extracted with 100 milliliters of this part may safely be used in the pro- ethyl acetate at reflux temperature for duction of or as a component of tex- 1 hour, yields total extractives not to tiles or textile fibers and subject to exceed 1 percent by weight of the res- provisions of such regulation. ins. (5) Substances identified in this para- (c) In accordance with good manufac- graph (d)(5), subject to such limitations turing practice, finished articles con- as are provided:

List of substances Limitations

(i) Fibers: Cotton. Polyethylene terephthalate complying in composition with For use only in the manufacture of items for repeated use. the provisions of § 177.1630(e)(4)(ii). Rayon.

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