... stable, hard to be hydrolyzed, hard to be destroyed by acid or alkali, safety in use, no toxicity, no pollution. HPAA ... .2,Specification: ItemsIndexAppearanceDark umber transparent viscous liquidSolid content %45-50Phosphorous acid(as PO33-)% ≤4.0pH(1% solution)1-3Density (20oC)g ... , play as a corrosion inhibitor in the field of steel & iron, petrochemcal, power plant and medicine. It is suitable as a ...