Raw expanded vermiculite 1.Size: 0.5-1mm,1-3mm 2- ... .Model: 20-40mesh, 40-60mesh, 60-80mesh, 200 mesh, 325mesh Raw expanded vermiculite Vermiculite is a natural mineral that expands with ... exchange capacity.Vermiculite is one of the safest, most unique minerals in the world.Vermiculite is readily available around the world ...