Perlite as the acidic lava eruption from the vitreous by rapid cooling of rock, is a natural glass. Perlite with different pigment due to ion and was yellow, red meat, dark green, brown brown, dark gray. Glass gloss or pearl luster, after weathering oil sheen, brittle, Mohs hardness 5.5 to 7, irregular-shaped fracture, conchoidal, split sheet. Streak white, thin edge of the debris and transparent to translucent, all-glass structure, pearl structure. Density of 2.2 ~ 2.4g/cm3, refractive index 1.486 ~ 0.506, refractoriness 1300 ~ 1380 ℃. 
 The most prominent physical properties of perlite is its expansion, the burning products into the perlite. Perlite raw materials will be broken to a certain size, add in the temperature of 1000 ~ 1300 ℃, its rapidly expanding volume of 4 to 30 times as perlite, expanded its reasons for the rapid heating is due to moisture and minerals contained in the volatile and, upon heating to burst scattered, along with a lot of truth in the air inside the glass light stone. 
 Perlite different because the original rock, it can be many kinds of products, but the swelling are the original stone from 10 to 20 times the mass per unit volume is very light, the sand 1 / 10 ~ 1 / 20, fire resistance and insulation properties excellent. 
 The main purpose is to create expanded perlite perlite, it is a super-lightweight, high performance insulation material, acoustic performance, chemical stability strong, and can fire, heat insulation, heat, cold, moisture absorption, widely used in construction, metallurgy, petroleum, chemical, electric power, cast, gardening, soil improvement, making detergents and other means.