When the rubber material containing the inorganic filler is exposed to the flame, the rubber is degraded or burned, and the inorganic residue or ash with less strength is left after the degradation or combustion products are volatilized. These residues are usually non-agglomerated or self-supporting, and even break into granules or powders, so they do not have a fire protection effect. When the specially-designed ceramized rubber is exposed to the flame, depending on the type and formula of the rubber, it can be ceramized at 350 ～ 800 ℃ or above, and sintered into a porous self-supporting ceramic body at 650 ～ 1000 ℃ In high-temperature flames, the structural integrity can be maintained for a certain period of time (0.5 ~ 2h), which can play a good role of "passive fire protection" and earn valuable time for fire safety.