(1-Hydroxyethylidene)bis-phosphonic acid tetrasodium salt HEDP 4Na CAS 3794-83-0

CAS : 3794-83-0

Appearance : White powder/Colorless Liquid

Molecular Formula: C2H4Na4O7P2

Molecular weight: 293.96

Other Name: HEDP Na4, (1-Hydroxyethylidene)bis-phosphonic acid tetrasodium salt

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What is HEDP 4Na CAS 3794-83-0?

This product is a brownish-yellow viscous liquid. The relative density (at 20℃) is 1.40. The pure form has a melting point of 198-199℃ and is soluble in water and ethanol. The solid product has strong hygroscopicity.

Specification

Item	Specification
Appearance	White powder
Active Content (as HEDP)%	56.0MIN
Active Content (as HEDP 4na)%	80MIN
Total phosphoric acid (as PO43-)%	52MIN
PH(1% water solution)	11~12
Iron ppm	20MAX
Dry Weigh loss (Moisture)%	15MAX

Item	Specifications
Appearance	Colorless or pale yellow transparent liquid
Active Content (as HEDP)%	20.3-21.7
Active Content	29.0-31.0
pH	10.0- 12.0
Iron, ppm	20 max
Density @20℃ , g/cm3	1.26- 1.36

Application

Can be complexed with a variety of metal ions.

Used as scale inhibitor in cooling water and boiler water treatment. Good heat resistance. It still has a good effect at 200℃.
Can also be used as corrosion inhibitor, cyanide-free plating additive.