NBN T 03-238-1980 工業(yè)用硅酸鉀鈉,干物質(zhì)測定.準(zhǔn)備不易溶于沸水中產(chǎn)品的溶液,不溶于水物質(zhì)的測定
Sodium and potassium silicates for industrial use - Preparation of solution of products not easily sOluble in boiling water and determination of matter insoluble in water