Description

Phthalic Anhydride is a vital industrial organic compound and a key aromatic dicarboxylic acid derivative. Its primary commercial value lies in its role as a versatile and cost-effective precursor for the synthesis of plasticizers, unsaturated polyester resins, and alkyd resins. This makes it an essential raw material for manufacturers in the plastics, coatings, and construction industries seeking to produce durable and flexible materials.

Application

• Plasticizer Production: The predominant use, serving as the starting material for phthalate ester plasticizers like DOP (Dioctyl Phthalate) and DINP, which are used to impart flexibility to PVC products such as cables, flooring, and synthetic leather.
• Unsaturated Polyester Resins (UPR): A core component in the production of UPRs, which are reinforced with fiberglass to create strong, lightweight composites used in marine vessels, automotive parts, and construction panels.
• Alkyd Resins: A key ingredient in the formulation of alkyd resins, which are widely used in solvent-based paints, varnishes, and enamels for their excellent durability and gloss.
• Dyes and Pigments: Acts as an intermediate in the synthesis of anthraquinone-derived dyes and certain phthalocyanine pigments, which are valued for their colorfastness and stability.
• Pharmaceutical Intermediates: Used in the synthesis of certain active pharmaceutical ingredients (APIs) and other fine chemicals.
• Flame Retardants: Employed as a building block in the manufacture of certain halogen-free flame retardant additives for polymers.

Basic Information

Product Name	Phthalic Anhydride
CAS No.	85-44-9
Molecular Formula	C8H4O3
Molecular Weight	148.12 g/mol
Synonyms	1,3-Isobenzofurandione; 1,2-Benzenedicarboxylic Anhydride; Phthalandione; Phthalic Acid Anhydride; Benzene-1,2-dicarboxylic Anhydride; Anhydride Phtalique; FTALOWY BEZWODNIK; PA
EINECS	201-607-5

Quality Control

Our Phthalic Anhydride is manufactured under stringent process controls to ensure batch-to-batch consistency and high purity. Quality is verified through a comprehensive suite of analytical tests including assay, melting point determination, and impurity profiling. Certificates of Analysis (COA) documenting full specifications are provided with each shipment. Our quality management system supports compliance with relevant global regulatory frameworks.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area away from moisture, heat, and incompatible materials such as strong bases and amines. Due to its hygroscopic nature, containers must be kept tightly sealed to prevent absorption of atmospheric moisture which can lead to caking and hydrolysis. Recommended storage temperature is between 15°C and 25°C.

Specification

Item	Specification
Appearance	White crystalline flakes or needles
Identification (IR)	Conforms
Assay (Titration)	≥ 99.5 %
Melting Point	130.5 - 132.5 °C
Color (APHA)	≤ 20
Free Acid (as Phthalic Acid)	≤ 0.1 %
Ash Content	≤ 0.01 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.