Index Name Appearance | Index | ||||
Premium Grade | First Grade | Qualified | |||
White crystalline powder | White crystalline powder | White crystalline powder | |||
Content% (m / m) > | 99.70 | 99.70 | 99.50 | ||
Melting point C> | 151.5 | 151.5 | 151.0 | ||
ammonia water chroma, platinum cobalt color number < | 5 | 5 | 15 | ||
Moisture % (m / m) < | 0.20 | 0.27 | 0.40 | ||
Ash mg / kg > | 7 | 10 | 35 | ||
Fe mg / kg < | 1.0 | 1.0 | 3.0 | ||
Nitrate content mg / kg < | 10.0 | 10.0 | 50.0 |