These ties are injection-molded of 6/6 nylon— won’t corrode or stretch. Durable locking mechanism holds securely even when used to bundle vibrating or flexing materials.Ties continue to hold tension even in oily spray or wet environments.Easily apply ties by hand or use a tensioning tool—order tools separately. Ties are UL-component recognized, and are self-extinguishing as per UL 94 Flam. Class: V-2 (models 06830-85 and -95 have a UL flame rating of UL94-HB). All solid design cable ties ("A", and "E" meet military specification MS3367 except the extra-heavy duty models (06830-42 and -99). Ties withstand temperatures to 185°F (85°C) and have a melting point of 495°F (257°C); except for barbed design cable ties which withstand temperatures to 167°F (75°C) and have a melting point of 425°F (218°C). All ties remain flexible to –40°F (–40°C). Efficient range of ties may be higher or lower in your specific application.