21 CFR § 177.2210 - Ethylene polymer, chlorosulfonated.
Ethylene polymer, chlorosulfonated as identified in this section may be safely used as an article or component of articles intended for use in contact with food, subject to the provisions of this section.
(a) Ethylene polymer, chlorosulfonated is produced by chlorosulfonation of a carbon tetrachloride solution of polyethylene with chlorine and sulfuryl chloride.
(b) Ethylene polymer, chlorosulfonated shall meet the following specifications:
(1) Chlorine not to exceed 25 percent by weight.
(2) Sulfur not to exceed 1.15 percent by weight.
(3) Molecular weight is in the range of 95,000 to 125,000.
(c) The additive is used as the article, or a component of articles, intended for use as liners and covers for reservoirs intended for the storage of water for drinking purposes.
(d) Substances permitted by § 177.2600 may be employed in the preparation of ethylene polymers, chlorosulfonated, subject to any limitations prescribed therein.
(e) The finished ethylene copolymers, chlorosulfonated shall conform to § 177.2600(e) and (g).