The reasons causing sand inclusion 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；
The sand inclusion 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。
When using in moulding sand, it can promote oriental solidification of castings and prevent burn-on and sand inclusion of castings, and improve roughness of castings.
在铸造生产中可以促进铸件的方向性凝固，防止粘砂、夹砂等铸造缺陷和改善铸件表面粗糙度。
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