Carbon fiber thermal insulation material has excellent thermal insulation effect at high temperature. When used in vacuum or inert gas atmosphere, the heat-resistant temperature can reach 3000 ℃. In addition, the product has the characteristics of light weight, low thermal expansion coefficient, low heat absorption, low outgassing and so on. It is being used more and more widely in the field of high-end equipment. There are two types of carbon fiber insulation materials: graphite hard felt and graphite soft felt.