Perlite (perlite) It is a vitreous rock formed by crushing and calcination, white beads loose particles. Non-toxic, tasteless, no burning, no corrosion. Because of its very low thermal conductivity and reliable chemical stability, good fluidity and filling of low bulk density. Is widely used in industry, agriculture, national defense, environmental protection, chemicals, food, construction and other industries. Especially in the cryogenic engineering, air separation unit (oxygen plant cold box), and other integrated projects with other insulation material can not be replaced by the superior performance. 
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