... Acetate CA Dexel, Cellidor, Setilithe Tough, transparent, high cost Handles, eyeglass frames Polyamide 6 (Nylon) PA6 Akulon, Ultramid, Grilon High strength, fatigue ... friction, almost opaque to clear, very high cost Air filters, eyeglass frames, safety masks Polycarbonate PC Calibre, Lexan, Makrolon Very tough, temperature ...