Registration Dossier
Registration Dossier
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EC number: 230-022-8 | CAS number: 6915-15-7
Endpoint summary
Administrative data
Description of key information
Additional information
Physical state: White powder with characteristic odour
Melting Point: 131 deg C
Boiling Point: decomposes in a range of 225 - 235 deg C. Estimated: 321.5 deg C at 101.3 kPa
Relative density: 1.615 at 20 deg C
Particle size distribution:
> 425 μm 0.3%
300 μm 0.4%
250 μm 7.6%
212 μm 39.6%
180 μm 22.8%
150 μm 9.9%
106 μm 10.5%
<106 μm 9.0%
Vapour pressure: 0.000039 Pa at 25 deg C
Partition coefficient (log Pow): –1.26 (undissociated); -6.14 at pH= 8
Water solubility: 647 g/L at 20 deg C
Surface tension: not determined
Flash point: not determined
Auto-flammability: not determined
Flammability: not flammable, but will support combustion
Explosiveness: not explosive
Oxidising properties: not oxidising
Stability in organic solvents: not critical
Dissociation constant: pKa1 = 3.51 and pKa2 = 5.03 at 20 deg C
Viscosity: not determined.
REACH guidance on the identity of substances states that, for substances with chiral centres, in the absence of any indication to the contrary, it is assumed that a substance is an equal (racemic) mixture of the two forms”. As a result the undefined form (CAS 6917-15-7) is regarded as being the same form as the defined (+/-) form (CAS 617-48-1).
In addition it is noted that, in order to provide more accurate descriptions, CAS now registers and names substances with partially defined stereochemistry. Previously, partial stereochemistry was generally ignored. Racemic mixtures of substances having single chiral centers are now indexed, registered, and named as non-stereospecific substances. The decision to discontinue the racemate distinction was based on the observation that most of the chemical substances encountered in the literature are presented without any explicit indications of their racemic nature but which in the majority of the cases are probably racemates.
The distinction that CAS was making between the racemic and non-stereospecific (or relative) forms was judged to cause scattering in indexing and registration, and complications in database searching. Thus, DL-malic acid and malic acid (stereospecificity unspecified) now receive the same CAS Registry Number and CA index name: 6915-15-7, Butanedioic acid, hydroxy-. The Registry Number for the DL-form (617-48-1) will be cross-referred to the Registry Number of the non-stereospecific form (6915-15-7).
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.
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