Maleic Anhydride is a white crystalline solid with the chemical formula C₄H₂O₃ and CAS number 108-31-6. It is an important organic chemical intermediate widely used in various industries.

Key Specifications:

  • CAS No.: 108-31-6
  • Appearance: White crystals / flakes / pellets
  • Purity: ≥ 99.0%
  • Melting Point: 52.8°C
  • Boiling Point: 202°C
  • Molecular Weight: 98.06 g/mol

Main Applications

Maleic Anhydride is primarily used for the production of:

  • Unsaturated Polyester Resins (UPR) – the largest application
  • Alkyd resins and coatings
  • Fumaric acid and malic acid
  • Lubricant additives
  • Agricultural chemicals
  • Paper sizing agents and specialty polymers

It is widely applied in composites, automotive, construction, marine, and coating industries.

Why Choose Our Maleic Anhydride?

  • High purity and stable quality
  • Available in flakes, pellets, or molten form
  • Reliable supply and competitive price
  • Excellent reactivity for efficient production

Frequently Asked Questions (FAQs)

What is Maleic Anhydride used for?

It is mainly used to manufacture unsaturated polyester resins, coatings, and various chemical derivatives such as fumaric acid and malic acid.

What is the CAS number?

CAS 108-31-6

Is it soluble in water?

It reacts with water to form maleic acid (hydrolysis).

How should it be stored?

Keep in a cool, dry place, protected from moisture. Use airtight containers.

Is Maleic Anhydride hazardous?

Yes, it is corrosive and can cause skin and eye irritation. Proper PPE and ventilation are required. Please refer to the SDS for safety details.

Which industries use Maleic Anhydride?

Composites, paints & coatings, lubricants, agriculture, and food additives (via derivatives).

Can it be used in food applications?

The pure anhydride itself is not used directly in food, but its derivatives (such as fumaric and malic acid) are approved for use as food additives.

Interested in Maleic Anhydride?

Contact us for quotes, specifications, or technical support.

Contact Us

We respond quickly and offer reliable global supply.