... gradeFirst gradeQualified productCa,%6.5±0.56.5±0.66.5±0.7Free acid (as Stearic Acid), % ≤0.5Loss on heat,% ≤2.03.0Melting point ... ,°C149~155≥140≥125Fineness on 0.075mm test ... sieve, % ≥99.599.0Mechanical impurity (0.1—0.6mm) granules ≤6612Bulk density g/cm3 ...