Perlite is a glassy acidic volcanic lava by crushing, screening, preheating, roasting the rapid expansion of its transient occurrence of porous structure made of white particulate matter, has good chemical stability, light weight, heat insulation, sound absorption, non-combustible, non-toxic, acid and other characteristics, can be widely used in construction, chemical, metallurgical, electrical, defense and other industries, is a cheap and good thermal insulation material can also be used for the cultivation of flowers and trees gardening soil.