... 325mesh0-8mm 2.Color:white and gray 3.technique :expanded 4.H.S code:6806200000 5.Specific gravity:0.15-2.4g/ ... 7PH6.5-7.5 Water soluble <0.1%Acid soluble <2%Dioptre1.483-1.5063.Chemical properties CompositionAl2O3SiO2Fe2O3CaONa2OK2OMaOPercentage12-1668- ... 51-40.34.Perlite features : Poisonless,tasteless,staleless,nonconbustible,acid-resistant,alkali-resistant,Fireproofing,sound proofing ,light weight , ...