... , 120-200mesh 325mesh Expanded Perlite: 60mesh, 100mesh, 120mesh, 150mesh, 0.1-1mm, 0.5-1.5mm1-2mm, 2-4mm3-6mm 4-8mm Horticultural Perlite ... -50mesh 50-70mesh 90-120mesh70-90mesh 20-40mesh ,0.05-1mm,0.06-2.5mm,0.1-1mm1-3mm3-5mm,4-8mm >40 micron ... .5 Water soluble <0.1%Acid soluble <2%Dioptre1.483-1.5063.Chemical properties CompositionAl2O3SiO2Fe2O3CaONa2OK2OMaOPercentage12-1668-740.1-20.15-1.54-51-40.34 ...