3921906091 - Woven polytetrafluoroethylene fabric, coated or covered with a copolymer of tetrafluoroethylene and trifluoroethylene having perfluorinated alkoxy side-chains ending in carboxylic acid or sulphonic acid groups, whether or not in the potassium or sodium salt form Harmonized System Codes, Taric Code, HS Code, HTS Code, Harmonized Commodity Description, Commodity Codes, Classification of goods, Tariff Nomenclature, Customs Tariff Number, Tariff Classification.