4-1100 features a silicone cover that will withstand a wice range of temperature while retaining good release characteristics. The cover can withstand -100F to 500F and the carcass is rated -40F to 250F. 3 Ply Silicone Hot Stock and Water is popular in tire and rubber plants where high temperature capabilities and good release characteristics are important. This is an excellent belt for the tread extruder and cementing line. Do not use this belt on the batch off line.