... .Water treatment chemicals HEDP 2.CAS:2809-21-4 3.Scale inhibitors,corrosion inhibitor,cleaners,complexant 4. Best price 1.Product :Product ... the oxidized materials on these metals’ surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250°C. HEDP has ... APHA (Hazen):80 max 4.Usage:HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field ...