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EC number: 267-956-0
CAS number: 67953-76-8
Water solubility: HEDP-xK is
commercially available as aqueous solutions at typically approximately
20% w/w to 43% w/w; these products are miscible in water with estimated
water solubility of ≥230-530 g/L.
The substance HEDP-xK and its
analogues are known to be highly hydrophilic and extremely
water-soluble. HEDP-xK was reported as miscible or freely miscible in
water with reported concentrations of 20 - 43% at 20°C but it is not
clear from the source report whether this is expressed as %w/w, %v/v or
%w/v. Using the solution densities reported for HEDP-xK, the equivalent
water solubility in g/L using density and concentration is reported as
≥230 -530 g/L. In addition, as the value is known to be extremely high,
the exact value is considered not significant for the chemical safety
assessment for human health or environmental assessment and this limit
value is therefore sufficient and is considered to be reliable.
This conclusion is supported by a
measured water solubility of 774 g/L at 20°C and pH 10.4 for the
tetrasodium salt of HEDP (HEDP-4Na). The available data are used as
weight of evidence to indicate that the substance is highly soluble in
Phosphonate salts are highly water
soluble and are supplied as aqueous solutions. Free acids are less
soluble than the salts; however, aqueous solutions in excess of l %
active material can be prepared. The aqueous solutions of sodium and
potassium salts are miscible in water.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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