Product Description Specification CHECK ITEM | QUALITY INDEX | RESULT | APPEARANCE | WHITE POWDER | ACCORD | MOLTEN COLOUR (PT-CO) | ≤ 20 | 10 | HEAT COLOUR (PT-CO) | ≤ 40 | 30 | SULPHURIC ACID COLOUR (PT-CO) | ≤ 40 | 20 | PURITY % | ≥ 99.5 | 99.96 | CRYSTALLIZATION POINT ℃ | ≥ 130.5 | 131.2 | FREE ACID % | ≤ 0.20 | 0.015 |
Usage ① | Phthalic anhydride and Polyols (such as glycerin, pentaerythritol) are polycondensated to form poly (aryl ester) resin, which is used in paint industry | ② | If it is polycondensated with ethylene glycol and unsaturated acid, unsaturated polyester resin is formed, which can be used to manufacture insulating paint and glass fiber reinforced plastics. | ③ | Phthalic anhydride is also a raw material for the synthesis of benzoic acid and terephthalic acid, and also used in drug
synthesis. |
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