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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pharmaceutical/food contact purified grade
Purified isophthalic acid gets specific heading 2917.36; technical grade falls to 'other'.
If dimethyl esters of isophthalic acid
Esters classified with parent acid per Chapter Note 5(A), but specific provisions may apply.
If technical mixtures with impurities >1%
Impurities exceeding chemical compound definition shift to chemical preparations.
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Import Tips & Compliance
• Require manufacturer's specification sheet confirming 99%+ purity for Chapter 29 classification
• Bulk powder shipments need anti-caking stabilizers documented to remain under this heading
• Avoid classifying as Chapter 38 if blended with solvents beyond transport stabilization limits
Related Products under HTS 2917.39.70.00
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.
Benzene-1,3,5-tricarboxylic Acid (Trimesic Acid)
Trimesic acid features symmetrical 1,3,5-tri carboxylic substitution on benzene, ideal for metal-organic frameworks (MOFs) and coordination polymers. HTS 2917.39.70.00 aromatic polycarboxylic acid. Perfect 120° linker geometry.