Items | Standard | ||||||||||
Appearance | White powder | White needle | |||||||||
Active content(%) | ≥92 | ≥93 | ≥95 | ≥92 | ≥93 | ≥95 | |||||
Petroleum ether soluble substance(%) | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | |||||
Inorganic salt content(NaCl+Na2SO4)(%) | ≤5.5 | ≤4.5 | ≤2.5 | ≤4.5 | ≤3.5 | ≤2.5 | |||||
Water content(%) | ≤2.5 | ≤2.5 | ≤2.5 | ≤3.5 | ≤3.5 | ≤3.0 | |||||
PH value(1% solution) | 7.5~9.5 | 7.5~9.5 | 7.5~9.5 | 7.5~9.5 | 7.5~9.5 | 7.5~9.5 | |||||
Whiteness(WG) | ≥90 | ≥90 | ≥90 | ≥90 | ≥90 | ≥90 |