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Melamine | Premium | Excellent 1 | Excellent 2 | First class | Second level | Third level |
NO. | 1+ | 01 | 02 | 03 | 04 | 05 |
Appearance | White powder with small impurities | White powder with more impurities | White powder with a lot of impurities | White powder with a lot of impurities | White powder with a lot of impurities | Light yellow powder |
Purity% | ≥99.8 | ≥99.8 | ≥99.8 | ≥99.0 | ≤99.0 | ≤99.0 |
Moisture | ≤0.1 | ≤0.1 | ≤0.1 | ≤0.2 | ≥0.2 | ≥0.2 |
PH value | 7.5-9.5 | 7.5-9.5 | 7.5-9.5 | 7.5-9.5 | 7.5-9.5 | 7.5-9.5 |
Ash | ≤0.03 | ≤0.03 | ≤0.03 | ≤0.05 | ≥0.05 | ≥0.05 |
Haze degree | ≤10 | ≤20 | ≤20 | ≤30 | ≥30 | ≥50 |
Color degree | ≤10 | ≤20 or bluish and greenish | ≤20 or bluish and greenish | ≤30 or bluish and greenish | ≥30 | ≥50 |










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