Vermiculite Physical properties before expanding: Appearance:exfoliated,flake or superposed flake.It contains 10,000 slices in the thick of 2.54cm. Luster:pearl luster,grease luster,no luster,surface dinginess and various luster. Color:goden yellow,brown,brown and green,dark green,black,variedness and striation white. Bulk density:2.2-2.8 g/cm3 Hardness:1-1.5 Bulk density:1,100-1,200 kg/m3 Melting point:1,320-1,350 C degree Intensity of pressure:100-150 Mpa Moisure:7% Appr. Physical properties after expanding: Grade size (mm) Bulk density (kg/m3) water absorption (%) impurity (g/m3) 1 >4 145 475