检验项目Test items

标准要求Specification

外观Appearance

细小，轻的白色粉末(fine light white powder)

氧化钙含量(以干品计) Assay of CaO

9.0%~10.5%

游离酸（以硬脂酸计）Free acid

≤1%

干燥失重Loss on drying

≤3.0%

重金属Heavy metals

≤0.001%

熔 点Melting point

152~158℃

粒 度Particle size

99%通过325目(≥99% through 325mesh)

堆密度Bulk density

0.1~0.35g/ml