Inspection Items | USP Requirement |
---|---|
Appearance | Fluffy, white powder |
Viscosity(mPa•s,20r/min,25℃)(1% Aqueous Solution) | 47000-77000 |
Viscosity(mPa•s,20r/min,25℃)(1.0% Aqueous Solution + 1.0% NaCl) | ≥4000 |
Solution Clarity (420nm, %) | ≥85 |
PH value | 2.5-3.5 |
Loss on drying (%) | ≤2.0 |
Heavy metal(ppm): (Pb, As, Hg, Sb) | ≤20 |
Moistening time(3% aqueous solution,25℃,min) | ≤25.0 |