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EC number: 237-410-6
CAS number: 13775-53-6
Cryolite is an
inorganic clear or white to yellowish, sometimes reddish or black
crystalline solid. It has a melting point of 1009-1012˚C (Ullmann's
Encyclopedia of Industrial Chemistry, 2002). As the substance is a solid
with a melting point well above 300 ˚C, in accordance with Column 2 of
REACH Annex VII, studies on boiling point study and vapour pressure do
not need to be conducted. The relative density of cryolite is 2.97 at 20
˚C (Ullmann's Encyclopedia of Industrial Chemistry, 2002). The water
solubility of cryolite is 0.602 g/L at 20 ˚C and pH = 5.5-7 and 0.217 g/L
at 20 ˚C and pH = 8.5-9 (Safepharm Laboratories Ltd., 2008). The studies
on octanol/water partition coefficient, flash point study and the
stability in organic solvents do not need to be conducted, as the
substance is inorganic. Surface activity is not predicted based on the
substance structure; neither is it a desired substance property.
Cryolite is hydrolytically unstable. As cryolite is a solid, viscosity
is not a relevant property. The substance is not expected to be
explosive, as it does not contain chemical groups which are associated
with explosive properties. In addition, as the substance is considered
to be incapable of reacting exothermically with combustible materials
based on its chemical structure, oxidising properties are not expected.
The performance of the tests on auto-ignition temperature and
flammability is considered to be scientifically unjustified in
accordance with Annex XI of REACH, as the substance is incapable of
reaction with oxygen due to the fact that metal ions are already present
in the highest possible oxidation state, and fluorine, being the most
electronegative element, cannot be oxidised by oxygen. Water reactivity
and pyrophoric properties are not expected for cryolite based on the
experience in handling the substance. The performance of the study on
dissociation constant is considered to be scientifically unjustified in
accordance with REACH Annex XI, as, according to Chapter R.7.1.17 of
REACH Guidance on information requirements and chemical safety
assessment, this property is important for ionisable organic substances.
As cryolite is an inorganic salt, it is expected to dissociate fully
into the respective cation and anion in aqueous solution. Possible
dissociation of hexafluoroaluminate moiety, although it may occur upon
dissolution, is considered to be irrelevant for this endpoint.
results regarding the particle distribution were obtained (results of
laser diffraction determination) for cryolite: D10 = 1.73μm; D50 =
9.78μm; D90 = 20.97μm (Solvay Fluor GmbH, 2009).
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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