JM - TG refractory casing by a special hybrid material, fire and a certain high temperature rapid expansion, in the process, form a kind of good insulation porous medium, so as to achieve heat insulation fire purposes. Fire protection casing does not contain halogen, and have the characteristics of low smoke and high oxygen index products, divided into longitudinal incision fire casing and fire filled tube two without longitudinal incision, construction according to the following table according to the cable/choose corresponding specification of fire protection casing pipe diameter for package, the rest of the seal number in the table of space application without longitudinal incision of fire fill the tube to fill.