- Country of manufactureKazakhstan
Perlites call natural material, the breed which is volcanic glass, as a part of which 70 - 75% of SiO2; 12 - 14% of AI2O3; 3 - 5% of NaO, approximately as much K2O, to 1% of Fe2O3, CaO, MgO. Ha to the edge of a stream of a lava, in places of initial contact of magmatic fusions and a terrestrial surface, as a result of sharp cooling of a lava are formed the volcanic glass called obsidian. Further underground waters gradually get through obsidian, promoting its hydration and formation of hydroxide of obsidian - perlite.
Separateness small concentric - skorlupovataya on which it breaks up to the roundish kernels reminding pearls is very characteristic of perlite. Among other volcanic breeds perlite differs in existence in the composition of water of constitution which makes not less than 1% of its weight. Porosity of perlite can make 8 - 40% .