What is Trimellitic Anhydride TMA CAS 552-30-7?

Trimellitic Anhydride, commonly abbreviated TMA and also called 1,2,4-benzenetricarboxylic anhydride, is an aromatic anhydride with molecular formula C9H4O5. It is supplied as a reactive intermediate for plasticizer and resin manufacture, not as a finished coating additive.

Why is Trimellitic Anhydride described as multifunctional?

TMA contains both an anhydride group and an additional carboxylic acid group, allowing it to introduce branching or functionality into polyester, alkyd and imide-type resin structures. This makes it useful for tailoring molecular architecture and final resin properties.

What are the main applications of Trimellitic Anhydride?

TMA is used to make trimellitate plasticizers for heat-resistant flexible PVC and to produce polyester powder-coating resins, alkyds, polyester-imides and polyamide-imides. These products often serve wire-and-cable insulation, electrical varnishes and high-performance coatings.

Why must Trimellitic Anhydride be protected from moisture?

The anhydride group can hydrolyse in contact with water to form carboxylic acid, reducing anhydride content and changing resin stoichiometry. TMA should therefore be kept dry and stored in well-closed packaging until use.

What physical form and melting behaviour should be expected?

Trimellitic Anhydride is normally supplied as white flakes or crystalline powder with a melting point around 162-166 deg C. It has a relatively high density of about 1.54 g/cm3, and the selected packaging depends on the agreed grade and downstream handling route.

Trimellitic Anhydride (TMA) CAS 552-30-7

Trimellitic Anhydride, commonly abbreviated TMA, CAS 552-30-7, is an aromatic multifunctional anhydride supplied for trimellitate plasticizer and industrial resin manufacture. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 552-30-7
Synonyms: Trimellitic Anhydride, TMA, 1,2,4-Benzenetricarboxylic Anhydride
Einecs: 209-008-0
Molecular Formula: C9H4O5
Grade: Industrial Grade
Package: 25 kg bags; 500 kg / 1000 kg FIBC bulk bags

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Product Description

Trimellitic Anhydride (TMA) CAS 552-30-7 is 1,2,4-benzenetricarboxylic anhydride, with EC 209-008-0 and molecular formula C9H4O5.

Synonyms: Trimellitic Anhydride; TMA; 1,2,4-Benzenetricarboxylic Anhydride.

CAS: 552-30-7.

Molecular formula: C9H4O5.

It is supplied as white flakes or crystalline powder.

It is positioned as an aromatic multifunctional anhydride for trimellitate plasticizer and industrial resin manufacture.

It is a process raw material and not a finished coating additive.

It is used in trimellitate plasticizer manufacture for flexible PVC, including wire-and-cable and heat-resistant vinyl compounds.

It is used in polyester powder-coating resin and alkyd resin production.

It is used in polyester-imide and polyamide-imide resin routes for electrical-insulation varnishes and wire enamels.

It is used in specified epoxy and specialty resin systems requiring a reactive anhydride intermediate.

It is used in glass-fibre, mineral or sand-binder resin systems based on compatible TMA chemistry.

It contains both an anhydride group and an additional carboxylic acid group, allowing it to introduce branching or functionality into resin structures.

It has a melting point around 162-166 C and a relatively high density of about 1.54 g/cm3.

The anhydride group is moisture sensitive and can hydrolyse to form carboxylic acid, so it must be kept dry.

Confirm anhydride assay, colour, free-acid or moisture limit and particle form for the stated route.

Store dry in well-closed packaging, use suitable PPE when handling, and follow the current SDS.

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

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Trimellitic Anhydride TMA CAS 552-30-7?

A: Trimellitic Anhydride, commonly abbreviated TMA and also called 1,2,4-benzenetricarboxylic anhydride, is an aromatic anhydride with molecular formula C9H4O5. It is supplied as a reactive intermediate for plasticizer and resin manufacture, not as a finished coating additive.
Q:
Why is Trimellitic Anhydride described as multifunctional?

A: TMA contains both an anhydride group and an additional carboxylic acid group, allowing it to introduce branching or functionality into polyester, alkyd and imide-type resin structures. This makes it useful for tailoring molecular architecture and final resin properties.
Q:
What are the main applications of Trimellitic Anhydride?

A: TMA is used to make trimellitate plasticizers for heat-resistant flexible PVC and to produce polyester powder-coating resins, alkyds, polyester-imides and polyamide-imides. These products often serve wire-and-cable insulation, electrical varnishes and high-performance coatings.
Q:
Why must Trimellitic Anhydride be protected from moisture?

A: The anhydride group can hydrolyse in contact with water to form carboxylic acid, reducing anhydride content and changing resin stoichiometry. TMA should therefore be kept dry and stored in well-closed packaging until use.
Q:
What physical form and melting behaviour should be expected?

A: Trimellitic Anhydride is normally supplied as white flakes or crystalline powder with a melting point around 162-166 deg C. It has a relatively high density of about 1.54 g/cm3, and the selected packaging depends on the agreed grade and downstream handling route.

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