几年以来,制砖工业企业,在不断提高产品质量方面作了不少工作,取得了很大的成绩,特别是在全国粘土砖质量暂行标准颁发以后,产品质量更有了显著的提高,很多企业的机制砖合格率达到了99%以上,一等品率达到90%左右,烧成损失率只有百分之零点几,手工砖合格率也达到98.4%以上,烧成损失率还不到 Over the past few years, the brick industry enterprises have done a lot of work in improving product quality and achieved great results. Especially after the provision of the national provisional quality standards for clay bricks, the quality of products has improved significantly. The qualified rate of the enterprise’s machine bricks has reached 99%, the first-rate product rate has reached about 90%, the firing loss rate is only a few percent, and the hand brick acceptance rate has reached 98.4%. The firing loss rate is still less than