CFR › Title 46 › Part 164 › §164.015-246 CFR §164.015-2Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Unicellular expanded polyvinyl chloride-acetate copolymer or synthetic rubber modified polyvinyl chloride, polymer or copolymer plastic foam shall be of three types as follows:(b)[Reserved]