Trimellitic Anhydride (TMA)
Trimellitic anhydride is a trifunctional aromatic acid anhydride used in wire enamels, plasticizers, and alkyd coatings. It qualifies under HTS 2917.39.70.00 as an aromatic polycarboxylic acid derivative (anhydride form) not specifically provided for elsewhere. The solid flakes are highly reactive with amines.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If specifically enumerated elsewhere
Specific subheadings take precedence over residual 'other' per Chapter Note 3.
If nucleic acid derived aromatic anhydrides
Certain heterocyclic anhydrides classified in 2934; purely aromatic stay in 2917.
If pre-mixed with polyester polyols
Organic composite solvents/preparations shift to Chapter 38.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Anhydride classified with parent acid per Chapter Note 5(E); provide structural confirmation
• Flammable solid Class 4.1 shipping; ensure proper UN packaging and MSDS documentation
Related Products under HTS 2917.39.70.00
Isophthalic Acid Technical Grade
Isophthalic acid is a meta-substituted aromatic dicarboxylic acid used in alkyd resins, polyester coatings, and copolyesters. Classified under HTS 2917.39.70.00 as an aromatic polycarboxylic acid not specifically enumerated elsewhere in heading 2917. This meta-isomer provides superior chemical resistance in coatings.
1,2,4,5-Tetracarboxybenzene (Pyromellitic Acid)
Pyromellitic acid, the diacid precursor to PMDA, is used in specialty polyimides and electronic materials. Classified under HTS 2917.39.70.00 as an aromatic polycarboxylic acid (four -COOH groups on benzene). Typically handled as dihydrate form.
Benzene-1,2,3-tricarboxylic Acid (Hemicellic Acid)
Hemicellic acid is a tri-carboxylic aromatic acid used in resin synthesis and as a pharmaceutical intermediate. It falls under HTS 2917.39.70.00 as an aromatic polycarboxylic acid not otherwise specified. The 1,2,3-substitution pattern gives unique reactivity.
Diphenic Acid
Diphenic acid (2,2'-biphenyldicarboxylic acid) is used in polymer synthesis and as a chiral resolving agent. Although biphenyl-based, classified under HTS 2917.39.70.00 as aromatic polycarboxylic acid per Chapter 29 structure. Provides rigid linker in specialty polymers.
Mellophanic Acid
Mellophanic acid (benzene-1,2,3,5-tetracarboxylic acid) serves as a monomer for heat-resistant polymers and electronic materials. Classified HTS 2917.39.70.00 as aromatic polycarboxylic acid with unsymmetrical substitution. Enables cross-linked network structures.
Prehnitic Acid
Prehnitic acid (benzene-1,2,4,5-tetracarboxylic acid) used in polyimide films and high-performance composites. Identical reactivity to pyromellitic acid but different substitution pattern. HTS 2917.39.70.00 as aromatic polycarboxylic acid, other.