Heat insulator and process for its production

摘要

To permit better removal of the air during the pressing operation of compressed heat insulators for heating constructions, comprising a fine-particle insulating material, for example pressed into a receiving tray or compressed in a bottom mould of a press, and to improves its resistance to fluctuating temperatures in use, the heating insulator (2) is fully or partially surrounded by a relatively thin boundary layer of a coarse-grained crystallised composition. <IMAGE>