志純矽砂,石英砂,樹脂砂,鉻砂,橄欖砂,透氣嘴,石英粉,離型劑, 鑄造砂,resin coated sand,silica sand,foundry sand,Thermal reclaimed sand,Shell molding sand,Vent hole, CHROME SAND,OLIVINE SAND,COREBOX VENTS,SILICA FLOUR,RELEASE AGENT