This standard applies to cork bricks for low-temperature insulation made of cork (Quercus variabilis B1. The outer bark of the tree, also called cork.) particles without adding adhesive, compressed and baked, which are internationally known as expanded pure agglomerated cork. . It is mainly used for heat insulation in refrigerators, refrigeration equipment, constant temperature rooms, etc. The general operating temperature is -60~+80℃, and the maximum operating temperature is about 130℃.