Isophthalic acid is a white solid with a slight unpleasant odor that sinks in water. It is primarily used as an intermediate in the production of polymers and resins, including unsaturated polyester resins and alkyd resins.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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[4-(Octyloxy)phenyl]phenyl-iodonium
photoinitiator for polymerization reactions
Ammonium bromide
Photographic emulsion and fireproofing agent
Ammonium fluoride
Etching and frosting glass
Ammonium chloride
Fertilizer and soldering flux
The international HS code for ISOPHTHALIC ACID (CAS 121-91-5) is 2917.39.
2917.39
2917 39 85
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
benzene-1,3-dicarboxylic acid
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C1=CC(=CC(=C1)C(=O)O)C(=O)O
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