PHTHALIC ANHYDRIDE

PRODUCT PHTHALIC ANHYDRIDE (NAPHTHELENE BASED)
OPERATIVE GB/T 15336-2013
NO. ITEM QUALITY INDEX RESULTS
1 APPEARANCE WHITE FLAKES OR CRYSTALLINE POWDER WHITE FLAKES OR CRYSTALLINE POWDER

2 MOLTEN COLOUR (PT-CO) ≤20 10

3 HEAT COLOUR (PT-CO) ≤50 30

4 SULPHURIC ACID COLOUR (PT-CO) ≤60 30

5 PURITY/% ≥99.50 99.96

6 CRYSTALLIZATION POINT ℃ ≥130.5 131.3

7 FREE ACID /% ≤0.20 0.025