... natural quartz sand,glass balls,metal balls and other low-strength proppant in the alternative,the oil and gas production has ... and sintered at high temperature, high temperature, high pressure, high strength, conductivity and strong, and corrosion resistance, etc., is the exploitation ... and gas wells. 4.Our product type as beolw : 1.Compression Strength : 52 MPa (7500 psi) ; 69 MPa (10000 psi) ; 86 ...