PRODUCT QUALITY CHARACTERISTICS
PHTHALIC ANHYDRIDE, industrial grade is produced in compliance with GOST 7119-77, and has the following quality parameters:
|
Parameter Description |
Quality A Specification, Top Grade |
|
1. Appearance |
White scales and powder, or melt |
|
2. Phthalic anhydride, wt %, minimum |
99.9 |
|
3. Freezing point, ℃, minimum |
130.9 |
|
4. Phthalic acid |
None |
|
5. Maleic anhydride, wt %, maximum |
0.05 |
|
6. Iron, wt %, maximum |
0.0002 |
|
7. Ash, wt %, maximum |
0.002 |
|
8. APHA colour, molten, max: – On a finished product basis – During the warranty period, on a powder/scale basis – During the warranty period, on a molten basis |
15 20 Not applicable |
|
9. APHA colour, molten, after heating at 250℃ for 90 min, max: – On a finished product basis – During the warranty period, on a powder/scale basis On a molten basis – During the warranty period, on a molten basis |
40 60 Not applicable |