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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If polymerized into polyimide resin
Polymer forms exceed Chapter 29 compound definition; move to Chapter 39.
If classified as naphthalic anhydride
Specific aromatic anhydrides have dedicated provisions before 'other'.
If solutions >50% solvent content
Chapter Note 5(e) excludes solutions suitable for specific end-use.
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Import Tips & Compliance
• Molecular weight and purity certification required to distinguish from polymer intermediates
• Highly reactive; ship under nitrogen atmosphere with stabilizer 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.