What is Pyromellitic Dianhydride (PMDA)?

PMDA is 1,2,4,5-benzenetetracarboxylic dianhydride, CAS 89-32-7, with molecular formula C₁₀H₂O₆ and molecular weight 218.12. It is the reactive dianhydride form used for condensation reactions, distinct from pyromellitic acid.

What specifications should be confirmed before purchase?

Confirm assay, appearance, melting range, moisture, free acid content and color. The listed industrial material is 99% minimum; request the batch analysis to verify purity and the method used, because residual acid or moisture can affect polymerization performance.

How should PMDA be stored and handled?

PMDA is moisture-sensitive and should be stored in tightly sealed containers in a cool, dry area. Avoid humid air and water contact, use dust controls and suitable PPE, and follow the safety information for spill, disposal and first-aid procedures.

Why is PMDA suitable for polyimide films and high-performance polymers?

PMDA has a rigid aromatic dianhydride structure that reacts with diamines to form polyamic acid, which is then imidized to polyimide. This aromatic imide backbone provides high heat resistance, chemical resistance and mechanical strength.

Pyromellitic Dianhydride (PMDA) CAS 89-32-7

Pyromellitic Dianhydride (PMDA), CAS 89-32-7, is a highly reactive aromatic dianhydride monomer used mainly for polyimide films and resins and as a high-performance epoxy curing agent. Confirm the required assay, melting range and moisture for the intended polymerization.

CAS: 89-32-7
Synonyms: 1,2,4,5-Benzenetetracarboxylic dianhydride, PMDA, Pyromellitic dianhydride, Benzene-1,2,4,5-tetracarboxylic dianhydride
Einecs: 201-898-9
Molecular Formula: C₁₀H₂O₆
Grade: Industrial grade 99%
Package: 25kg/bag

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Product Description

Pyromellitic Dianhydride (PMDA), CAS 89-32-7, is 1,2,4,5-benzenetetracarboxylic dianhydride, a reactive aromatic dianhydride monomer; the EC/EINECS number is 201-898-9.

Synonyms: 1,2,4,5-Benzenetetracarboxylic dianhydride; PMDA; Pyromellitic dianhydride; Benzene-1,2,4,5-tetracarboxylic dianhydride.

CAS: 89-32-7.

Molecular formula: C₁₀H₂O₆.

Molecular weight: 218.12.

EC number: 201-898-9.

It is normally supplied as a white crystalline solid with an assay of about 99% and is sensitive to moisture.

It is mainly used to manufacture polyimide resins and films and as a high-performance curing or crosslinking agent in epoxy systems and polyester powder coatings.

Its rigid aromatic dianhydride structure reacts with diamines to form polyamic acid, which is imidized to polyimide with high heat resistance, chemical resistance and mechanical strength.

It can also serve as a curing agent for epoxy resins and a matting or crosslinking agent in powder coatings.

Confirm assay, appearance, melting range, moisture, free acid content and color.

It is harmful if swallowed and causes serious eye damage; inhalation may cause allergy, asthma or breathing difficulties. It is combustible and can release toxic gases at high temperature.

Store in tightly sealed containers in a cool, dry area away from humid air, water and strong oxidizers, and use dust controls with suitable PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

Regulated-use suitability must be confirmed separately with current product-specific documentation.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Pyromellitic Dianhydride (PMDA)?

A: PMDA is 1,2,4,5-benzenetetracarboxylic dianhydride, CAS 89-32-7, with molecular formula C₁₀H₂O₆ and molecular weight 218.12. It is the reactive dianhydride form used for condensation reactions, distinct from pyromellitic acid.
Q:
What is PMDA mainly used for?

A: It is primarily used to manufacture polyimide resins and films, and as a high-performance curing or crosslinking agent in epoxy systems and polyester powder coatings. It helps raise heat resistance, chemical resistance and mechanical strength.
Q:
What specifications should be confirmed before purchase?

A: Confirm assay, appearance, melting range, moisture, free acid content and color. The listed industrial material is 99% minimum; request the batch analysis to verify purity and the method used, because residual acid or moisture can affect polymerization performance.
Q:
How should PMDA be stored and handled?

A: PMDA is moisture-sensitive and should be stored in tightly sealed containers in a cool, dry area. Avoid humid air and water contact, use dust controls and suitable PPE, and follow the safety information for spill, disposal and first-aid procedures.
Q:
Why is PMDA suitable for polyimide films and high-performance polymers?

A: PMDA has a rigid aromatic dianhydride structure that reacts with diamines to form polyamic acid, which is then imidized to polyimide. This aromatic imide backbone provides high heat resistance, chemical resistance and mechanical strength.

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