- a white, crystalline, water-insoluble solid, C8H6O2, the para isomer of phthalic acid: used chiefly in the manufacture of resins and textile fibers.
- a white crystalline water-insoluble carboxylic acid used in making polyester resins such as Terylene; 1,4-benzenedicarboxylic acid. Formula: C 6 H 4 (COOH) 2
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