膨胀珍珠岩是近代一种新颖的轻质保温材料。国外早已生产,但我国于六十年代末和七十年代初才开发和生产。据有关资料介绍,国内现有大小约二百多个生产厂,但分布不均。膨胀珍珠岩容重按其粒径大小为40—250公斤/米~3,常温下的导热系数小于0.045千卡/米·时·℃,高温和低温下的导热系数也分别为0.05 Expanded perlite is a modern lightweight thermal insulation material. It has already been produced abroad, but China developed and produced it in the late 1960s and early 1970s. According to relevant information, there are about 200 production plants in China, but the distribution is uneven. The bulk density of expanded perlite is 40-250 kg/m 3 depending on the particle size, the thermal conductivity at room temperature is less than 0.045 kcal/m·h·°C, and the thermal conductivity at high and low temperatures is also 0.05