SPECIFICATIONS
| Name of the indicator | Mark A | |
| highest grade | I grade | |
| 1. Appearance | White flakes and powder or melt | White flakes and powder or melt Yellowish or pinkish tint allowed |
| 2. Mass fraction of phthalic anhydride,%, not less | 99.9 | 99.7 |
| 3. Crystallization temperature, ° C, not lower | 130.9 | 130.6 |
| 4. Mass fraction of iron,%, not more than | 0.0002 | 0,003 |
| 5. Phthalic acid content | Missing | Not standardized |
| 6. Mass fraction of maleic anhydride,%, not more than | 0.05 | Not standardized |
| 7. Mass fraction of ash,%, not more than | 0,002 | Not standardized |
| 8. Color of the melted product, Hazen units, not more than: Upon release During the warranty period
During the warranty period for melt |
15
20
Not standardized |
50
80
Not standardized |
| 9. The chromaticity of the molten product after heating at 250 ° C for 90 minutes, Hazen units, the no more: Upon release During the warranty period
During the warranty period for melt |
40
60
Not standardized |
200
Not standardized
Not standardized |
