... shot-proof glass, electritic shutters glass, etc....4. Hardware: German hardware: Roto, Siegenia, G-U.5. Accessory: Heat insulation ... strip: imported ploymer nylon PA 66 from GermanSealing joint strip: EPDM( corrosion resistance, heat resistance, ... ) 6. Surface treatment: SIKKENS brand water lacquer, imported from Germany, has no formaldehyde, In China, only our company ...