Hard carbon felt was compounded with a soft felt, according to customer requirements made of different shapes and sizes. Soft felt has a higher strength than the easy disassembly and long life. It is a new type of insulation material. Hard composite mat features: Performance Unit Standard Value Density g cm3 0.18-0.25% carbon content of> 99.0 Ash ppm <200 voltage characteristic surface direction / MPa 0.6 MPa 0.15 on both sides of the curved surface direction characteristic direction on both sides MPa MPa 1.0 2.0 Thermal conductivity W / mk (25 ℃) 0.26 Thermal expansion coefficient 0 ℃ -1000 ℃ 10-6 / K 2.5 Thermal expansion coefficient 1000 ℃ -2000 ℃ 10-6 / K 3.0 Heat Treatment Temperature ℃ 2200