Expanded perlite is an internal honeycomb structure of the white granular material made by preheated, baked and expanded perlite ore. Principle is: by preheating£¬fire£¬rapid heating(1000¡æ above)£¬then the moisture vaporizing, the crushed special size ore is expanded in softened ore to be porous structure£¬become original 10-30 times. Main features Lightweight Porous Heat-insulation Refactory Sound-absorption waterproof Non-toxic Corrosion-proof Applications: Construction: roofing& wall insulation, lightweight aggregate Industry: make hydrophobic perlite board£¬low-temperature£¬thermal Agriculture: soil ameliorant, soilless culture, pesticides evanescent agent. Insulation£ºengineering, industrial equipment, piping insulation etc. Others: filter aid, filler, abrasive materials, slag material of steelmaking.