Food and Drug Administration, HHS § 177.1480
Food and Drug Administration, HHS § 177.1480
§ 177.1460 Melamine-formaldehyde res- basic copolymers produced by the graft ins in molded articles. copolymerization of 73–77 parts by Melamine-formaldehyde resins may weight of acrylonitrile and 23–27 parts be safely used as the food-contact sur- by weight of methyl acrylate in the face of molded articles intended for use presence of 8–10 parts by weight of bu- in producing, manufacturing, packing, tadiene-acrylonitrile copolymers con- processing, preparing, treating, pack- taining approximately 70 percent by aging, transporting, or holding food in weight of polymer units derived from accordance with the following pre- butadiene. scribed conditions: (b) The nitrile rubber modified acry- (a) For the purpose of this section, lonitrile-methyl acrylate basic copoly- melamine-formaldehyde resins are mers meet the following specifications those produced when 1 mole of mel- and extractives limitations: amine is made to react with not more (1) Specifications. (i) Nitrogen content than 3 moles of formaldehyde in water is in the range 16.5–19 percent as deter- solution. mined by Kjeldahl analysis. (b) The resins may be mixed with re- (ii) Intrinsic viscosity in acetonitrile fined woodpulp and the mixture may at 25 °C is not less than 0.29 deciliter contain other optional adjuvant sub- per gram as determined by ASTM stances which may include the fol- method D1243–79, ‘‘Standard Test Meth- lowing: od for Dilute Solution Viscosity of Vinyl Chloride Polymers,’’ which is in- List of substances Limitations corporated by reference. Copies may be Colorants used in accord- obtained from the American Society ance with § 178.3297 for Testing Materials, 1916 Race St., of this chapter. Dioctyl phthalate ...... For use as lubricant. Philadelphia, PA 19103, or may be ex- Hexamethylenetetramine For use only as polymerization amined at the Office of the Federal reaction control agent. Register, 800 North Capitol Street, Phthalic acid anhydride .. Do. Zinc stearate ...... For use as lubricant. NW., suite 700, Washington, DC 20408. (iii) Residual acrylonitrile monomer (c) The molded melamine-formalde- content is not more than 11 parts per hyde articles in the finished form in million as determined by gas chroma- which they are to contact food, when tography. extracted with the solvent or solvents (iv) Acetonitrile-soluble fraction characterizing the type of food and after refluxing the base polymer in ace- under the conditions of time and tem- tonitrile for 1 hour is not greater than perature as determined from tables 1 95 percent by weight of the basic co- and 2 of § 175.300(d) of this chapter, polymers. shall yield net chloroform-soluble ex- (2) Extractives limitations. The fol- tractives not to exceed 0.5 milligram lowing extractive limitations are de- per square inch of food-contact surface. termined by an infrared [42 FR 14572, Mar. 15, 1977, as amended at 56 spectrophotometric method titled, ‘‘In- FR 42933, Aug. 30, 1991] frared Spectrophotometric Determina- tion of Polymer Extracted from Borex § 177.1480 Nitrile rubber modified ac- 210 Resin Pellets,’’ which is incor- rylonitrile-methyl acrylate copoly- porated by reference. Copies are avail- mers. able from the Center for Food Safety Nitrile rubber modified acrylonitrile- and Applied Nutrition (HFS–200), Food methyl acrylate copolymers identified and Drug Administration, 200 C St. in this section may be safely used as SW., Washington, DC 20204, or available components of articles intended for for inspection at the Office of the Fed- food-contact use under conditions of eral Register, 800 North Capitol Street, use D, E, F, or G described in table 2 of NW., suite 700, Washington, DC 20408, § 176.170(c) of this chapter, subject to and are applicable to the basic copoly- the provisions of this section. mers in the form of particles of a size (a) For the purpose of this section, that will pass through a U.S. standard nitrile rubber modified acrylonitrile- sieve No. 6 and that will be held on a methyl acrylate copolymers consist of U.S. standard sieve No. 10:
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