... density and high strength 2. Ceramic proppant of medium density and high strength 3. Ceramic proppant of high density and high strength ... proppant according to the depth and width of cracks Mesh size:6/12, 8/16, 12/18, 12/20, 16/20, 16/30, 20/40 ... , 30/50, 40/70 Strength stress :52MPa(7500psi),69MPa(10000psi),86MPa(12500psi),103MPa(15000psi); Ceramic Sand