DIN 52342-4-1980 玻璃生產用原料的檢驗.二氧化硅最低含量為 98% 的石英砂的化學分析.第4部分:以氧化鐵(III) Fe2O3 作為總含量計算的測定
Testing of raw materials for the production of glass; chemical analysis of arenaceous quartz with at least 98 % silica, determination of the total content calculated as iron(III)-oxide Fe2O3
Testing of raw materials for the production of glass; chemical analysis of arenaceous quartz with at least 98% silica; determination of the total content calculated as iron(Ⅲ)-oxide Fe2O3Essai des matières premières pour la production du verre; analyse c