foundry sand in mineral 1.used in oil fracturing 2.Bulk density: 1.95 to 2.05(g/cm3) 3.Angle factor; <1.1 4.20-1250mesh refractory foundry sand for casting in mineralCeramic Sand features:1, the thermal expansion coefficient is small, performance can be comparable with the zircon sand, sand with its preparation, no expansion of casting defects.2, sand for the ball, good fluidity, easy and good ...