Perlite is volcanic eruption of acidic lava formed by rapid cooling glassy rock, is a natural glass. Perlite with different colors due to ion and was yellow and white, red meat, dark green, brown brown, gray and black. Glass gloss or pearl luster, after weathering the oil sheen, brittle, Mohs hardness of 5.5 to 7, irregular-shaped fracture, conchoidal, split sheet. Streak white, thin edge of the debris and partially 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, its burning products into the perlite. Perlite materials will be broken to a certain size, added in 1000 ~ 1300 ℃ temperature, its volume expansion of 4 to 30 times as fast as perlite, its rapid expansion after the heating was due to the water contained in the ore and volatile, upon heating, scattered on the burst, there are many in-house will become a real air of glass light stone. 
 Different from the original rock as expanded perlite, it can be many kinds of products, but the swelling degree of the original stone are 10 to 20 times its mass per unit volume is very light, the sand, 1 / 10 ~ 1 / 20, fire resistance and insulation properties Excellent. 
 Main purpose is to create expanded perlite perlite, it is a super lightweight, high performance insulation material, acoustic performance, chemical stability, effects of fire and heat insulation, heat, cold, moisture absorption, widely used in construction, metallurgy, petroleum, chemical, power, casting, gardening, soil improvement, making detergents, etc..