1.Size: Expanded Perlite: 60mesh, 100mesh, 120mesh, 150mesh, 0.1-1mm, 1-2mm, 2-4mmHorticultural Perlite: 1-2mm, 2-4mm, 1-4mm ,3-5mm.2.Color :white and gray3.Specifications Refractive Index : 1.483-1.506 Free Moisture : maximum 0.5% pH (of water slurry) : 6.5 - 7.5 Specific Gravity : 2.2 - 2.4 g/cc Bulk Density (loose weight) : depending on the..