Project | I | II | III |
Whiteness % | 85-90 | 90-95 | ≥95 |
Zinc content % | ≥45 | ≥45 | ≥45 |
Phosphate % | 20-30 | 40-46 | 43-47 |
The PH value | 6-8 | 5-7 | 5-7 |
Oil absorption g/100g % | 25-35 | 25-35 | 25-35 |
Residue on sieve( 45um) % | ≤0.5 | ≤0.5 | ≤0.1 |
Moisture % | ≤1.5 | ≤1.5 | ≤1.5 |
Water-soluble salts % | | | ≤1 |
Cd ppm | | | 10-30 |
Cr ppm | | | 10-30 |
Hg ppm | | | ≤1 |
Pb ppm | | | 20-100 |
As ppm | | | 10-30 |