... white and gray 3.technique :expanded 4.H.S code:6806200000 5.Specific gravity:0.15-2.4g/cm3 ... 120mesh, 150mesh, 0.1-1mm, 0.5-1.5mm1-2mm, 2-4mm3-6mm 4-8mm Horticultural Perlite: 1-2mm, 2 ... -1090 ºCMelting point1280-1350 ºC Vickers hardness5.5-7PH6.5-7.5 Water soluble <0.1%Acid soluble <2% ... alkali-resistant,Fireproofing,sound proofing ,light weight ,etc 5.Applications:It can be used in oxygen manufacturer ...