As a leading manufacturer over 20 years. Our exquisite craftsmanship can meet all your requirements!
You are here: Home » Products » Organic Chemicals » Trimellitic anhydride


Share to:

Trimellitic anhydride

Trimellitic anhydride, or 1,2,4-Benzenetricarboxylic anhydride, is a white, flaky substance. Phthalic anhydride is mainly used as curing agent of epoxy resin, and can also be used in the production of plasticizer, coating, insulating paint, surfactant and so on.
  • 1,2,4-Benzenetricarboxylic anhydride, 4-Carboxyphthalic anhydride, 1,3-Dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid

  • White Flake

  • 552-30-7

  • C9H4O5

  • 192.125

  • 209-008-0

  • 227 °C



Trimellitic Anhydride Specification

Item Unit


Appearance / White Flake White Flake
Total Anhydride Content % ≥98.00 98.29
Acid Value mg KOH/g ≥873.00 873.44
Melting Point ≥164.0 165.2
Molten color(pt-co) # ≤120 120
PA content ppm ≤300 <300

COA - Trimellitic anhydride.pd


Trimellitic Anhydride Description

Trimellitic anhydride, 1,2,4-Benzenetricarboxylic anhydride. The molecular formula is C9H4O5. The appearance is white flake or powder. The melting point of trimellitic anhydride is 168℃ and the boiling point is 390℃. Trimaric anhydride dissolved in hot water and acetone, 2-J ketone, dimethylformamide, ethyl acetate, cyclohexanone. It is soluble in anhydrous ethanol and reacts, and slightly soluble in carbon tetrachloride and toluene. Trimellitic anhydride is mainly used as curing agent of epoxy resin, and can also be used in the production of plasticizer, coating, insulating paint, surfactant and so on.


Trimellitic anhydride uses

1. Plasticizer

Triisooctyl trimelate (TOTM) is produced by esterification reaction of trimelate anhydride and 2-ethylhexanol. TOTM plasticizer has the advantages of good fluidity, heat resistance (high flash point), low volatility, high electrical properties, resistance to all kinds of solvent extraction, and small resistance to migration. It can meet the requirements of 90℃, 105℃, 125℃ grade heat resistant cable and high voltage cable plastic sheath.

2. Coating

A new water-soluble alkyd resin coating can be obtained by the reaction of phthalic anhydride with dialcohol monoglyceride, hexanediol, propylene glycol, neopentyl glycol and other dialcohols, which can be used as electrophoretic primer for automobiles, refrigerators and washing machines.

3. Cured epoxy resin

When used as curing agent of epoxy resin, trimellitic anhydride has high reactivity and can cure epoxy resin in a short time. The solidified product has high thermal deformation temperature, excellent mechanical properties, electrical properties and drug resistance, suitable for epoxy castings and laminate products. The solid resin obtained by the reaction of trimellitic anhydride and glycerol, dissolved in solvent, has good adhesion to glass, aluminum, etc.

4. Insulating varnish

In type heat insulation paint and paint production, trimellitic anhydride used in the manufacture of polyester imide paint, modified polyester and polyamide imide lacquer paint, the product has good heat resistance, can be in the long-term use of 200 ℃ and above), wear resistance, resistance to damage, electrical insulation (breakdown voltage can reach 11.5 kV) and mechanical properties, is a class F or class H insulation varnish, It can be used as laminate resin for impregnated glass cloth, high temperature resistant covering material, insulating paint for wire and slot insulator for motor and other electrical equipment materials.

5. Surfactant

The surfactant with excellent surface activity can be prepared by mono-double esterification of trimellitic anhydride and fatty alcohols such as lauryl alcohol and octadecyl alcohol, and then the free carboxyl group on trimellitic anhydride is neutralized by NaOH.

6. Other uses

Phenylimide resin made from trimalic anhydride can be heated at 250 ~ 300℃ for a long time. It can be used to manufacture molded plastic parts such as electrical components, valves, bearings and jet engine parts. In addition, phthalic anhydride is widely used in aviation lubricants, dyes, inks, pharmaceuticals and agricultural chemicals. Products made with anhydride are used in electric wires and cables, automobile interior decoration, artificial leather, washing machine drainage hose, blinds, handbags, sealing materials and fillers, etc.


Trimellitic Anhydride Package and storage

Trimellitic anhydride is usually packaged in 25kg plastic lined compound bags, stored in a cool, ventilated and dry place, heat, moisture, sunscreen, away from heat.

Trimellitic anhydride-5



Q1: May I get sample?

A1: Free sample is available, you only need to pay freight.

Q2: How long does it take for me to get sample?

A2: Usually it will cost about 5 days after delivery.

Q3: How can I place an order?

A3: You can contact us about your order details  by E-mail, WhatsApp, Skype, etc.

Q4: How can you guarantee your products are qualified?

A4: We will test the goods and issue COA before delivery

Acetyl Tributyl Citrate

Apply Our Best Quotation
Contact us


Quick Links

Contact Us

Aozun Chemical                   
Your trustworthy chemical brand
Add: 128-1-16 HuaYuan Street, Wujin District, Chang Zhou City, China.
TEL: +86-519-83382137  
TAX: +86-519-86316850