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Purified IsoPhthalic Acid

CAS : 121-91-5

Purified IsoPhthalic Acid


Isophthalic acid (IPA) is a non-toxic organic compound with the formula C8H6O4. This colorless solid is an isomer of phthalic acid and terephthalic acid. These aromatic carboxylic acids are used as precursors (in the form of acyl chlorides) to commercially important polymers. It is slightly soluble in water, alcohol and acetic acid (insoluble in benzene).

Purified IsoPhthalic Acid


Isopthalic Acid 99.9 wt.%
Moisture 0.08 wt.%
Ash Content 15 Max. ppm
Fe 0.1 Max. ppm
Co 0.1 Max. ppm
MN 0.1 Max. ppm
3CBA 5 Max. ppm
m-Toluca Acid 75 Max. ppm



·    Isophthalic acid (PIA) is majorly used for PET (Polyethylene Terephthalate) copolymer, which is used in bottle resins and to a much lesser extent, for fibers. PIA (Purified Isophthalic Acid) reduces the crystallinity of PET, which serves to improve clarity and increase the productivity of bottle-making.

·    Unsaturated polyester resins, where the addition of PIA improves thermal resistance and mechanical performance, as well as resistance to chemicals and water.

·    Polyester/alkyd surface coating resins, where PIA increases resistance to water, overall durability and weather ability.



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