... Molecular Formula: C2H5O6P EINECS: 405-710-8 47-50% 2-Hydroxyphosphonocarboxylic Acid (HPAA)CAS No. 23783-26-8,4721-24-8Molecular Formula ... stable, hard to be hydrolyzed, hard to be destroyed by acid or alkali, safety in use, no toxicity, no pollution. HPAA ... :itemsindexAppearanceDark umber transparent viscous liquidSolid content %47.0-50.0Phosphorous acid(as PO33-)%4.0 maxDensity (20°C)g/cm31.30 ...