... color, thin-walled hollow, very light weight. The volume weight range from 250 to 450 kg/m3, Particle size is about 0 ... aluminum oxide based, It has the functions of fine particles, hollow, light weight, high strength, wear-resistant, thermal insulation, fire- ... 20.5-1.10.3-0.9 physical performance of hollow microsphere itemTest Metricshapehigh flow spherical powergrain diameter (um)10-400colorshallow ...