Cryogenic Perlite - Naturally Occurring Siliceous - Brochure

Perlite is a naturally occurring siliceous volcanic rock containing two to six per cent combined water. When the crude rock is crushed and heated above 1600° F ( 871° C) , the combined water vaporizes and the perlite expands four to twenty times its original volume. This expansion process creates countless cells in the glassy particles, which account for the excellent thermal conductivity of expanded perlite.