Expanded perlite is a white granular material with a honeycomb structure inside which the perlite ore is preheated and expanded by instantaneous high temperature roasting. The principle is as follows: the perlite ore is crushed to form a certain size of ore, preheated and calcined, and rapidly heated (above 1000 °C). The water in the ore is vaporized, and expands inside the softened vitreous ore to form a porous structure and expands in volume. 10-30 times of non-metallic mineral products. Perlite is divided into three forms according to its expansion process technology and application: open cell, closed cell, and balloon.
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