Multiple antidumping and countervailing duty orders cover specific resin and synthetic rubber products — including certain polyethylene terephthalate (PET) resins and rubber products — from named countries. Importers must check the International Trade Commission and Commerce Department order lists for their specific product and country of origin, as duties can be substantial and are assessed on an annual review cycle.

Traditional synthetic rubbers (e.g., SBR, NBR, EPDM) are vulcanizable elastomers classified primarily under HTS Chapter 40, while thermoplastic elastomers — which soften on heating without vulcanization — may classify under Chapter 39 as plastics. This distinction significantly affects applicable duty rates and any trade-remedy exposure, making polymer chemistry documentation essential for accurate entry.