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1·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；

2·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。

3·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。

4·Analysis is done to the causes of reject A30 block with sand inclusion, i. e. the elements of molding sand feature; cast structure, casting speed and arrangement for casting system, etc.

对A30气缸体夹砂废品产生的原因，即型砂性能、铸件结构、浇注速度、浇注系统的布置等方面的要素进行了分析。

5·The causes to such defects as cracking and sand inclusion in the integral rear draft lug and the body center plate filler are analyzed, and the technology improvement measures are described.

分析了一体式后从板座及上心盘座裂纹、夹砂等缺陷产生的原因，并介绍了工艺改进措施。

6·Utilizes the balanced coagulation technology solution plate class casting the entrapped slag, the sand inclusion, flaws and so on blowhole, improves the casting quality, reduces rejection rate.

运用均衡凝固技术解决平板类铸件的夹渣，夹砂和气孔等缺陷，提高铸件质量，降低废品率。

7·The common defects of the housing casting include cracks, sand drop, slag inclusion, shrinkage porosity and rough grain, etc.

机架的常见缺陷有裂纹、掉砂、夹渣、缩孔缩松和晶粒粗大等。