DIN 52240-6:1994 玻璃生產(chǎn)用原料的檢驗(yàn).碳酸鈣最低含量為 95% 的石灰石的化學(xué)分析.第6部分:二氧化鈦的測(cè)定
Testing of raw materials for the production of glass; chemical analysis of limestone with a minimum content of 95% calcium carbonate; determination of titanium(IV)oxide