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    Synonyms: 1,3-dioxophthalan
    Molecular Formula: C8H4O3
    Molecular weight: 148.11
    CAS NO: 85-44-9
    Phthalic anhydride is white needle-like crystals; steam pressure 0.13 kPa/96 .5 °C, flash point: 151.7 °C, boiling point 284 °C, density 1,53 g/cm3; it is insoluble in cold water and soluble in hot water, ethanol, ether, benzene and most other organic solvents.
    Quality standards:
    Melt Chroma(Chroma)≦50
    Thermal stable Chroma(Chroma number)≦150
    Crystallization point °C≧130.3
    Free acid content%≦0.3
    Phthalic anhydride is mainly used to produce plastic plasticizers, alkyd resins, dyes, unsaturated resins and certain medicines and pesticides; it is the standard solution of the labeled base; Phthalic anhydride condenses with polyols(such as glycerol and pentaerythritol) to form polyaromatic resin for use in the paint industry.buy Organic Raw Materials