Phthalic Anhydride is a white, crystalline organic compound primarily used as an intermediate in the production of plasticizers, resins, and dyes. With the molecular formula C₆H₄(CO)₂O, it is derived from the catalytic oxidation of orthoxylene or naphthalene. Due to its versatility and cost-efficiency, phthalic anhydride is one of the most widely utilized chemical intermediates in the petrochemical industry.

The principal application of phthalic anhydride lies in the manufacture of phthalate plasticizers, particularly dioctyl phthalate (DOP), which are extensively used to improve the flexibility and workability of PVC products. Additionally, phthalic anhydride is a key raw material in the production of unsaturated polyester resins (UPR), alkyd resins for coatings and paints, and various dyes and pigments.

Polysun offers high-purity phthalic anhydride suitable for a wide range of industrial applications. Produced through controlled oxidation processes and subject to strict quality assurance protocols, our PA ensures excellent performance, consistency, and compatibility in downstream processing.

Key industries served include plastics and polymers, automotive, construction, packaging, textiles, and surface coatings. The chemical’s strong reactivity, ease of handling, and economic viability make it a strategic input for manufacturers seeking efficient and scalable solutions.