The fire sleeve of Beijing Great Pack Materials Co.,Ltd is made of refractory matter and flame retardant.The fire sleeve has excellent fire insulation properties. It can prevent the fires from spreading as the fire sleeve set in the outer wall of the hard palstic drain. Also called high temperature sleeve, silicone rubber glass fiber casing, has high economic values. The fire sleeve is widely used in industries such as steel plant, coking plant and etc. An excellent high temperature resisted performance, prolongs the service life of the equipment at the same time the fire sleeve can ensure the safety of workers and expand the ecomomies of factory.