... and high density.2.By compression strength:52MPa(7500psi), 69MPa(10000psi), 86MPa(12500psi), 103MPa(15000psi).3.By specifications:6-12 ... 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.Moreover, ... Fax:+86.387.86631068 www.toproppant.com NO.4 20/40 used in North Dakota