Butyl rubber

{
  "id": "MLC-T-ENV-003868",
  "term": "Butyl rubber",
  "field": "Environment",
  "term_source": "Butyl Rubber",
  "definition": "Copolymer of isobutylene and other monomers. Typical other monomers include isoprene and methylstyrene. A typical composition of butyl rubber is approximately 85- to 99-percent isobutylene, and 1- to 15-percent other monomers. Most butyl rubber is produced by precipitation polymerization, although other methods may be used. Halobutyl rubber is a type of butyl rubber elastomer produced using halogenated copolymers.",
  "subject": "Chemical substances",
  "references": [
    "40 CFR 63.482 (CFR 2018)"
  ],
  "url": "https://mlchart.com/terminology/environment/butyl-rubber/"
}