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EC number: 267-956-0
CAS number: 67953-76-8
Water solubility: Commercially available HEDP-xK in the form of aqueous
solution products at typically 20% w/w to 43% w/w are miscible in water.
In support of the Key data, it is
notable that in general, phosphonate salts are highly hydrophilic and
extremely water soluble. Free acids are less soluble than the salts;
however, aqueous solutions in excess of 1% active acid material can be
In available secondary sources,
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. Since the
solution density is much higher than 1, the equivalent water solubility
in g/L using density and concentration is reported as ≥230 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. In addition, a measured water
solubility of 774 g/L at 20°C is determined for the tetrasodium salt of
HEDP (HEDP-4Na) using a relevant test method. The available data are
used as weight of evidence to indicate that the substance is highly
soluble in water.
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