Other
Polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives: > Aromatic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives: > Other: > Other: > Other: > Other
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified 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.
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.
Phloroglucinol Tricarboxylic Acid
This resorcinol derivative with three carboxylic acids serves in dye intermediates and pharmaceuticals. Classified HTS 2917.39.70.00 as aromatic polycarboxylic acid despite phenolic character. Highly soluble in alkaline conditions.
Terephthalic Acid Dimethyl Ester (DMTE)
DMTE serves as melt polymerization monomer for PET resins, offering advantages over PTA in processing. Classified with parent acid per Chapter Note 5(A/B) under HTS 2917.39.70.00. Liquid at room temperature facilitates handling.
1,4-Phenylene Diacetic Acid
This para-substituted aromatic diacetic acid used in liquid crystal polymers and pharmaceuticals. Methylene spacer provides flexibility vs dicarboxylic acids. HTS 2917.39.70.00 aromatic polycarboxylic acid classification.
Biphenyl-4,4'-dicarboxylic Acid
BPDA provides extended conjugation for high-performance polymers in displays and films. Classified HTS 2917.39.70.00 aromatic polycarboxylic despite extended system. Enables liquid crystalline behavior.
Fluorene-2,7-dicarboxylic Acid
Fluorene-based dicarboxylic acid for high refractive index polymers in optics. Fused ring system provides rigidity. HTS 2917.39.70.00 aromatic polycarboxylic acid classification.
Terephthalic Acid (PTA)
Terephthalic acid is an aromatic polycarboxylic acid with two carboxyl groups attached to a benzene ring, used primarily as a raw material for producing polyethylene terephthalate (PET) resins and fibers. It falls under HTS 2917.39.70.00 as an aromatic polycarboxylic acid that is neither specifically listed nor phthalic acid. This white crystalline powder is essential in the plastics and textile industries.
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.
Pyromellitic Dianhydride (PMDA)
Pyromellitic dianhydride is a tetrafunctional aromatic dianhydride used in high-performance polyimides for electronics and aerospace. Falls under HTS 2917.39.70.00 as an aromatic polycarboxylic acid anhydride derivative. Its rigid structure enables superior thermal stability.