UNI 5972-1967 不含土金属材料化学分析方法.耐磨白金属中,印刷用铅合金和锡.铅焊接合金中的铁测定.分光广度法
Methods for chemical analysis of soil-free metal materials. Among wear-resistant white metals, lead alloy and tin are used for printing. Determination of iron in lead soldering alloys. spectroscopic breadth method