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EC number: 905-588-0
CAS number: -
Data are provided on m, p and o xylene and ethylbenzene which are the
components of the streams and the data have been read across to the
streams in the category. Ethylbenzene and the xylene isomers are
structurally similar substances, consisting of a benzene ring with one
and two methyl functional groups attached respectively; the different
xylene isomers have the two methyl functional groups attached at
different locations. The presence and position of the second methyl
functional group on the benzene ring is not expected to change the
physico-chemical properties of the substance significantly. The
similarities in structure indicate that the physico-chemical properties
of the components of the streams are likely to be similar. All of the
components are relatively soluble in water, with limited potential to
partition. The water solubility (Yalkowsky and He 2003) and the log
partition coefficient (Hansch et al 1995) of ethylbenzene, m-, o- and
p-xylene are 190.7 mg/L and 3.15, 146 mg/L and 3.2, 170.5 mg/L and 3.12
and 156 mg/L and 3.15, respectively.
Data on the physical properties of the xylene isomers and ethylbenzene
were obtained from a number of secondary sources. The data in these
secondary sources are based on a critical evaluation of peer-reviewed
data and the selected values are considered to be reliable and
representative of the property under investigation. Information on the
review process was documented in the introduction of the source. The use
of Klimisch codes (Klimisch et al. 1997) was extended to these secondary
sources and a reliability code of (2) valid with restrictions was
assigned when using the authoritative secondary source.For the
purpose of the risk assessment (exposure assessment), the mean values of
selected physico-chemical properties were used.
The flash point and boiling point of m-xylene are 27°C and 139°C,
of p-xylene are 27°C and 138°C, of o-xylene are 32°C and 145°C and
ethylbenzene are 18°C and 136°C respectively. The lowest flash point and
boiling point used in the risk assessment are 18°C and 136°C
respectively. Therefore, the streams in this category meet the criteria
for flammable liquid category 2 under CLP (flash point < 23°C and
boiling point >35°C).
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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