Diametrical expansion 1.3Working temperature range: -50ºC ~ +500ºCInstantaneous temperature: 1150ºCFlammability: self-extinguishing. Fire-proof sleeving is fabricated from a dense E-glass fiberglass and a thick coating of self-extinguishing high temperature silicone rubber which is engineered to protect hoses, cables and wire harnesses from damage due to exposure to extreme heat, fire and molten splash. Fire sleeve also provides a high degree of insulation value, protecting hot or cold or cryogenic lines, pipes and tubing from heat or cold loss, meanwhile it can help to save energy and provide abrasion resistance protection..