This 50% aqueous solution of 4-sulfophthalic acid is the key component of the preferred electrolyte for the production of "hard" anodic oxide coatings for aluminium-based alloys. These highly abrasion resistant coatings come in a number of colors, metallic and brownish gray, black, bronze and gold amking them suitable for achitectural usage.

CAS Number: 89-08-7

Synonyms:

1,2-Benzenedicarboxylic acid, 4-sulfo-
Phthalic acid, 4-sulfo-
4-Sulphophthalic acid