... 300mesh, 1-2mm, 2-4mm,3-6mm,4-8mmPerlite Filter Aid50-120mesh, 100-200mesh, 300meshUnclosed and closed Cell ... : Physical PropertiesChemical CompositionsExteriorYellow white,light red,green,gray,brown brown,gray black and so onSiO270-74Specific gravity2.2-2 ... oxygen and hydrogen.2. To be used as filter liquor,oil,medicine,food and dirty water.3. ... .Mobile: 86 13582186358 Raw perlite(white and gray)