Isophthalic acid is a very important intermediate, purified Isophthalic acid is used with other intermediate to manufacture quality products. Isophthalicacid (8CI);3-Carboxybenzoic acid;NSC 15310;m-Benzenedicarboxylic acid;m-Carboxybenzoic acid;m-Dicarboxybenzene;m-Phthalic