ITEM | STANDARD |
Appearance | White to cream colored powder |
Purity (dry basis, %) | >= 99.5 |
Viscosity (1%, 25℃, mPa.s ) | 1500 - 2000 |
Degree of substitution | >= 0.9 |
pH (1% solution) | 6.0- 8.5 |
Loss on drying (%) | =< 10 |
Sulphated ash (%) | 23 - 27 |
Acid rate | >= 0.6 |
Lead | =< 3 mg/kg |
Arsenic | =< 2 mg/kg |
Mercury | =< 1 mg/kg |
Cadmium | =< 1 mg/kg |
Total heavy metals (as Pb) | =< 10 mg/kg |
Total plate count (cfu/g) | =< 1000 |
Yeast and mould (cfu/g) | =< 100 |
Coliform | Negative |
Salmonella | Negative |