Isophthalic Acid

Other Trading Names:

  • IPA
  • PIA

CAS Number: 121-91-5

HS Code: 29173980

Types of Packaging:

  • 25kg Fiber Paper drum
  • 1kg /Bag
  • 25kg/bag
  • 1 ton/bag
Inquiry right-arrow $100.00
Availability: In stock
Isophthalic Acid

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Chemical Name

Isophthalic acid



Molecular Formula


CAS Number



White powder

Grade Standard

Industrial Grade



Melting Point

341-343 °C

Boiling Point



1.54 g/cm³

Chemical Description 

  • Isophthalic Acid (IPA), known scientifically as benzene-1,3-dicarboxylic acid, is a colorless to white crystalline compound with the molecular formula C8H6O4. It is distinguished by its meta-substitution pattern on the benzene ring, which significantly influences its chemical and physical properties.
  • IPA is acclaimed for its role in enhancing the durability, strength, and heat resistance of polyethylene terephthalate (PET) resins, which are widely used in the production of beverage bottles, packaging materials, and synthetic fibers. It improves the performance of PET by modifying its crystallinity, which in turn enhances the material's mechanical and barrier properties.
  • In the production of high-performance plastics, Isophthalic Acid is a key ingredient. Its incorporation into polyester resins, particularly those used in fiberglass-reinforced plastics (FRP), contributes to the resins' improved water resistance, chemical stability, and thermal properties. This makes FRP suitable for demanding applications in the automotive, marine, and construction industries.
  • IPA is also pivotal in the paint and coatings industry, where it is utilized in the synthesis of alkyd and polyester resins. These resins form the basis of high-quality paints and coatings, offering exceptional durability, gloss retention, and resistance to chemicals and environmental factors.
  • The synthetic fibers industry benefits from IPA's ability to improve the properties of fibers, making them more suitable for clothing, upholstery, and industrial applications. It imparts enhanced strength, dyeability, and resistance to chemicals and heat to the fibers.
  • Isophthalic Acid plays a role in the manufacture of plasticizers and synthetic lubricants, contributing to their performance characteristics in various applications.
  • Its low water solubility and high purity make it a preferred choice for specialized chemical synthesis, including the production of high-purity polymer and resin intermediates.
  • As with Ethylene Carbonate, the diverse applications of Isophthalic Acid underscore its significance in numerous industrial processes, from plastics and polymers to paints, coatings, and beyond. Its role in enhancing product performance and durability makes it a valued compound in the development of advanced materials and sustainable solutions.
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Isophthalic Acid