Physical & Chemical Properities After high temperature expansion, it has the characteristics of porous structure, light weight, low thermal conductivity, stable chemical composition, thermal insulation, non-combustible, non-toxic and tasteless, sound absorption and environment friendly Application 1. Heat/sound/low-temperature/oxygen preservation or insulation material in various fields 2. Foundry material as covering agent to clear up slag for metal casting 3. Perlite filter aid used in foundry, food, drink, medicine, chemical,etc 4. Agricultural / horticultural / hydroponics /soilless culture perlite as seedings growing media 5. Widely used in construction, metallurgy, petroleum, machinery, light industry, water and electricity, casting, medicine, food, agriculture and horticulture fields.