Phthalic Anhydride is mainly used in the production of plasticizers, unsaturated polyester resins and alkyd resins.
PETROM uses orthoxylene (a basic petrochemical product) and atmospheric air as the basic raw materials. The product is obtained by fixed bed catalytic oxidation.


Plasticizers – Thanks to the excellent features and performance, coupled with low production costs, Phthalic Anhydride esters dominate the plasticizer market, mainly in the laminating of PVC (polyvinyl chloride) resins. Some examples of phthalic anhydride based plasticizers are DINP – diisononyl phthalate (general use); DIDP – DiIsodecil phthalate (wires and cables) and DIAP – DiIsoamil phthalate (hoses and shoe soles).

Unsaturated Polyester Resins – These resins feature prominently in the manufacture of reinforced plastics, synthetic marbles, buttons, etc. They are generally obtained through the condensation of saturated and unsaturated dibasic acids with glycols, by successive copolymerization with crosslinking agents. Thus transformed into hard, non-fusible and endowed with excellent general characteristics. The low cost and good processing characteristics of resins produced from phthalic anhydride have assured it to be the most widely used saturated acid.

Alkyd Resins – Alkyd resins, used in the paint industry for the preparation of synthetic enamels and varnishes, are obtained by the condensation of phthalic anhydride with polyhydric alcohols and saturated or unsaturated high fatty acids (soybean, castor, coconut, etc.). These resins are soluble in common solvents and create tough and flexible paint films.

Other Important Applications – Phthalic anhydride is also used to produce anthraquinone and its derivatives such as phthalocyanines, phenolphthalein etc.


Guaranteed Specification (EPF-001 Rev.09)

Purity MÍN.%99,60
Melting Point MÍN.ºC130,6
Color (Molten)MÁX.(Pt/Co)20
Thermal Stability (*)MÁX.(Pt/Co)50 (*)
Phthalic AcidMÁX.%0,20
Maleic AnhydrideMÁX.%0,03
(*) Color after 90 min @ 250 °C

Further Information

Mol. Weight##148,11
Density (Solid)20ºCg/cm31,527
Density (Liquid)150ºC
mPas (Cp)
mPas (Cp)
Appearance (Solid)##White Flakes
Appearance (Liquid)##Clear Liquid


Bags: 25kg. Big bags of 0.5 and 1 ton.

Shelf Life

06 months.

Material Safety Data Sheet

Phthalic Anhydride

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