Thermal reflective material: can reflect heat by itself, with high reflection index. Common materials are gold, silver, nickel, aluminum foil or metallized polyester.
Porous material: there are many pores in itself, and the air thermal conductivity in the pores is very low, that is, the pores are used for heat insulation. Common materials are foam and fiber materials.
Vacuum material: its heat insulation principle is to use the vacuum inside the material to block convection so as to achieve heat insulation effect, which requires very high materials.
Several common thermal insulation materials with low thermal conductivity include thermal insulation paper, glass fiber cotton board/felt, polyurethane foam board, centrifugal peeled fiber cotton/rock wool, micro-nano thermal insulation board and so on. Low temperature insulation requires thermal insulation materials with low thermal conductivity, such as vinylon thermal insulation hard felt and nano-based thermal insulation soft felt. High temperature insulation uses materials with high thermal conductivity, such as mica.