Phthalic Anhydride (PA)

Product Overview

Phthalic Anhydride (PA) is a widely used industrial organic chemical compound, primarily serving as a key intermediate in the production of plasticizers, unsaturated polyester resins (UPR), alkyd resins, coatings, dyes, and pharmaceuticals. It appears as white to colorless crystalline flakes or needles with a characteristic aromatic odor.

Due to its high reactivity and versatile chemical structure, phthalic anhydride plays a critical role in multiple downstream industries, including plastics, construction, automotive, electronics, and coatings.

Key Product Information

• Product Name: Phthalic Anhydride

• Chemical Formula: C₈H₄O₃

• CAS Number: 85-44-9

• Molecular Weight: 148.11 g/mol

• Appearance: White to colorless crystalline flakes

• Odor: Slight aromatic odor

• Solubility: Soluble in alcohol, acetone; reacts with water

• HS Code: 29173500

Production Process

Phthalic anhydride is commercially produced via catalytic oxidation of o-xylene or naphthalene in the vapor phase. Modern production mainly adopts the o-xylene oxidation process, offering higher efficiency, better yield, and lower environmental impact.

Typical Specifications

Specifications can be customized according to customer requirements.

Applications of Phthalic Anhydride

Plasticizers

Phthalic anhydride is a core raw material for producing phthalate plasticizers such as DOP, DBP, and DINP, which improve flexibility and durability in PVC products.

Unsaturated Polyester Resins (UPR)

Used extensively in fiberglass-reinforced plastics, construction panels, pipes, tanks, and marine composites.

Alkyd Resins

A key ingredient in alkyd resins for industrial paints, architectural coatings, and varnishes, offering excellent adhesion and gloss.

Dyes & Pigments

Acts as an intermediate in the synthesis of dyes, pigments, and optical brighteners.

Pharmaceuticals & Agrochemicals

Used in the manufacture of pharmaceutical intermediates and certain crop protection chemicals.

Packaging & Logistics

• Standard Packaging:

• 25 kg woven bags with inner PE liner

• 500 kg / 1000 kg jumbo bags

• Container Loading:

• 20 MT per 20’ FCL (25 kg bags, without pallets)

• Storage Conditions:

• Store in a cool, dry, and well-ventilated area

• Keep away from moisture and strong oxidizing agents

Safety & Handling

• Avoid direct contact with skin and eyes

• Use appropriate PPE: gloves, goggles, dust mask

• Handle in well-ventilated environments

• Refer to the Material Safety Data Sheet (MSDS) before use

Quality Control & Compliance

Our phthalic anhydride is produced under strict quality management systems and complies with international standards.
Available documentation includes:

• COA (Certificate of Analysis)

• MSDS

• TDS

• REACH / RoHS (upon request)

Why Choose Our Phthalic Anhydride?

• ✅ High purity and stable quality

• ✅ Reliable global supply chain

• ✅ Competitive pricing for bulk orders

• ✅ Flexible packaging and logistics options

• ✅ Experienced export support team

We serve customers across plastics, coatings, resin manufacturing, and chemical distribution markets worldwide.

Frequently Asked Questions (FAQ)

Q1: Is phthalic anhydride hazardous?

Phthalic anhydride is classified as an irritant. Proper handling and protective equipment are required.

Q2: Can you supply industrial and export-grade PA?

Yes, we supply both domestic industrial-grade and export-grade phthalic anhydride.

Q3: What is the minimum order quantity (MOQ)?

MOQ typically starts from 1 x 20’ FCL, but flexible arrangements are possible.

Q4: Can specifications be customized?

Yes, customized purity, packaging, and labeling are available upon request.