Properties:

HEDP•Na₄ is the sodium salt of HEDP, HEDP•Na₄ is an good scale inhibitor for calcium carbonate, it can be used in low pressure boiler water system, circulating water system, industrial and municipal cleaning water system and swimming pool.

The solid HEDP•Na₄ is white powder, soluble in water, easily deliquescence, suitable for use in winter and freezing districts. It is a kind of organophorphonic acid scale and corrosion inhibitor, can form stable complex with Fe, Cu and Zn ions, it can dissolve the oxides on metal surface, it has good scale and corrosion inhibition effect under 250℃.

HEDP•Na₄ is widely used in circulating cool water system, medium and low pressure boiler, oil field water pipelines as scale and corrosion inhibitor in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP•Na₄ is used as detergent for metal and nonmetal. In dyeing industry, HEDP•Na₄ is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP•Na₄ is used as chelating agent.

Specification:

Items	Index
Appearance	Colorless to yellowish transparent liquid	White powder
Active content (HEDP)%	20.3-21.7	60.0 min
Active content (HEDP•Na₄)%	29.0-31.0	85.0 min
Total phosphoric acid (as PO₄^3-) %	18.4-20.4	55.0 min
Fe, mg/L	20.0 max	35.0 max
Moisture，%	--	10.0 max
Density (20℃)g/cm³	1.26-1.36	--
PH (1% water solution)	10.0-12.0	11.0-12.0