Textile Polyamide/Nylon Filament Best nylon filament Polyamide commonly known as Nylon, English name Polyamide (PA), is a general term for thermoplastic resins containing repeating amide groups - [NHCO] - on the main chain of the molecule, including aliphatic PA, aliphatic-aromatic PA and aromatic PA . Among them, aliphatic PA has many varieties, large output and wide application, and its name is determined by the specific number of carbon atoms of the synthetic monomer. It was invented by the famous American chemist Carothers and his research group.Carbon fiber nylon filament