The reasons causing sandinclusion and slag inclusion are: ( 1 ) gaps between mould and core prints or cods too small;
前言： 湿砂型铸铁件产生砂孔和渣孔缺陷的主要原因是：（1）芯头或砂台的间隙偏小；
2
The sandinclusion glass fiber reinforced plastic pipe takes thermosetting resin as base body, take glass fibre and its products as reinforced material.
玻璃钢夹砂管道(以下简称夹砂管)是玻璃纤维与合成树脂及石英砂的复合体。
3
When using in moulding sand, it can promote oriental solidification of castings and prevent burn-on and sandinclusion of castings, and improve roughness of castings.