1-Hydroxy Ethylidene-1, 1-Diphosphonic Acid
CAS No. 2821-4
Molecular Formula: C2H8O7P2
Molecular weight: 206.02
Appearance Clear, Colorless to pale yellow aqueous solution White crystal powder
Active content (HEDP)% 60.0 min 90.0 min
Active content (HEDP·H2O)% - 98.0 min
Phosphorous acid (as PO33-)% 1.0 max 0.8 max
Phosphoric acid (as PO43- )% 0.6 max 0.5 max
Chloride (as Cl-)% 0.01 max 0.01 max
pH (1% water solution) 2.0 max 2.0 max
Density (20℃)g/cm3 1.40 min -
Fe, mg/L 10.0 max 5.0 max
Colour APHA (Hazen) 10.0 max -
Ca sequestration (mg CaCO3/g) 500.0 min
HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds.It can dissolve the oxidized materials on these metals’ surfaces. HEDPshows excellent scale and corrosion inhibition effects under temperature 250℃. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt). HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.
The solid state of HEDP is crystal powder, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals.
HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent. The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.
Package and Storage:
HEDP liquid: 200L plastic drum, IBC(1000L), customers’ requirement.
HEDP solid: 25kg/bag, customers’ requirement.
Storage for ten months in room shady and dry place.
Acidity, Avoid contact with eye and skin, once contacted, flush with water.
Contact Name: Jacktian
Company Name: Shandongdongtaiwatertreatment
Street Address: Yicheng Economic
Development Zone, Zaozhuang City ,
Shandong Province, P.r.china
Zaozhuang, Shandong 277300
Member name: DongtaiWaterTreatment
Member Since: 28 August 2018
Total Leads: 1 DongtaiWaterTreatment Import Export Business Leads
Business focus: Hedp, Water Treatment Chemicals, Scale Corrosion Inhibitor
Verify: Safe Import Export Tips
Product Category: Scale inhibitor