... in fields such as steel & iron, petrochemcal, power 2-Hydroxyphosphonocarboxylic Acid (HPAA)CAS No. 23783-26-8 Molecular Formula: ... hard to be hydrolyzed, hard to be destroyed by acid or alkali, safety in use, no toxicity, no ... transparent viscous liquidSolid content %47.0-50.0Phosphorous acid(as PO33-)%4.0 maxDensity (20°C)g/ ... in room shady and dry place. (HPAA)2-Hydroxyphosphonocarboxylic Acid