... /7 service.Our Top Ceramic proppant can be classified as followed:1. by bulk density:Light density, medium density and high density.2. by compression strength ... -12 mesh, 8-16 mesh, 12-18 mesh, 12-20 mesh, 16-20 mesh, 16-30 mesh, 20-40 mesh, 30-50 mesh, 30-60 mesh, 40-60 mesh, 40-70 mesh, 70-140 mesh, etc ...