... mesh Mainly used for precision casting refractory fused mullite sand Characteristics of refractory fused mullite sand: 1. High refractoriness above 1750. ... of refractory fused mullite sand:Size of Precision casting sand : 8-16, 16-30, 30-60, 30-80, 60-80,80-120, 10 ... -20 (mesh)Size of Precision casting flour: -200, -250, -270, -325 (mesh)Features of refractory fused mullite sand ...