Phthalic anhydride
Maleic anhydride
2-ethylhexyl
Fumaric acid

Phthalic anhydride (PA)

As an important organic chemical material, it is mainly for the production of plastic plasticizers, alkyd resins, dyes, unsaturated resins and some medicines and pesticides. Now, it is widely used in chemical, pharmaceutical, electronics, agriculture, coatings, chemical and other industrial sectors.
Molecular Formula: C8H4O3
Molecular weight: 148.12
Packing: plastic bag lined woven bag, Net wt 25kg
Structural Formula:

Item
Index
Top grade
First grade
Qualified product
Appearance
white scaly or crystalline powder
white scaly or crystalline powder with other colors
Fused chroma(Chroma No.) ≤
20
50
100
Chroma of Thermal stability(Chroma No.) ≤
50
150
-
Chroma of sulphuric acid (Chroma No.) ≤
60
100
150
Crystallization point °C ≥
130.5
130.3
130.0
Purity (Mass fraction) % ≥
99.5
99.5
99.0
Free acid (Mass fraction) % ≤
0.20
0.30
0.50
Ash (Mass fraction) % ≤
0.05
-
-
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