Phthalic anhydride

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White crystalline needles with a mild odor. Phthalic anhydride is used in the manufacture of dyes, alkyd resins, polyester resins, insecticides and many phthalate plasticizers. It is also used to make some fluorescent dyes such as fluorescein, eosin and rhodamine.

Synonyms and Related Terms



  • Combustible.
  • Irritating to skin and mucous membranes.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in ethanol, carbon disulfide and hot water. Slightly soluble in cold water and ether.

Composition C6H4(CO)2O
CAS 85-44-9
Melting Point 130.8 C
Density 1.52.7 g/ml
Boiling Point 285 C