BS 4427-5:1974(2011)
工业用三聚磷酸钠(三磷酸五钠)和焦磷酸钠(焦磷酸四钠)试验方法 第5部分:粒度分布的测定
Methods of test for Sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use — Part 5 : Determination of particle size distribution