... <1.1 4.20-1250mesh refractory foundry sand for casting in mineralCeramic Sand features:1, the thermal expansion coefficient is ... be comparable with the zircon sand, sand with its preparation, no expansion of casting defects.2, sand for the ball, good ... crackApplication rangethe application of a wide range of silicate sand, resin sand casting and brass, polished aluminum parts cleaning Comparison Nice ...