Tetra Sodium Salt of 1-Hydroxyethylidene-1, 1-Diphosphonic Acid


CAS NO.: 3794-83-0 (4-Na), 29329-71-3 (x-Na)
Dequest: 2016, 2016DG
Synonyms: Tetrasodium etidronate
Molecular Formula: C2H4O7P2Na4
Molecular weight: 294

Properties and Use:
HEDP•Na4 is the sodium salt of HEDP, is a 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. It is soluble in water with easy deliquescence. It is convenient to transport, suitable for using in winter and freezing districts. HEDP•Na4 is scale and corrosion inhibitor of organic phosphate salt, it 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 even at 250℃.

Items Index
Appearance White powder Colorless to yellowish transparent liquid
Active content (HEDP)% 56.0 min 20.3-21.7
Active content (HEDP•Na4) % 79.9 min 29.0-31.0
Fe3+ μ g/g 35.0 max 20 max
Moisture % 15 max --
Density (20 ℃ )g/cm3 -- 1.26-1.36
PH (1% water solution) 11.0-12.0 (1% water solution) 10.0-12.0( stock solution )

Package and Storage:
HEDP•Na2 liquid is packed in plastic drums. 30kg or 250kg per drum.
HEDP•Na2 solid is packed in plastic woven bag lined with polyethylene inner bag. The net weight of each bag is 25 kg. We can also customize for clients.
The product can be stored for ten months in shady places indoor.

Safety Protection:
HEDP•Na4 is alkaline. Avoid contact with eye and skin. In case of contact with eyes or skins, please rinse immediately with plenty of water.

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