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EC number: 295-405-4
CAS number: 92045-23-3
A complex combination of hydrocarbons produced by the distillation of the products of a steam cracking process. It consists predominantly of hydrocarbons having a carbon number of C4, predominantly 1-butene and 2-butene, containing also butane and isobutene and boiling in the range of approximately minus 12°C to 5°C (10.4°F to 41°F).
The members of this category are gases and
will predominantly partition to the atmosphere. This will limit their
aquatic toxicity. Due to the difficulty associated with conducting
aquatic toxicity tests, experimental data were not available for the
members of this category. In the absence of measured data, estimated
data were calculated using the QSAR model.
ECOSAR Program v1.00. in EPI Suite v4.00.
Calculations were conducted using substances which were considered
representative of the category (butane, isobutane, butene, isobutene).
The toxicity of the substances was calculated to range from 7.7 mg/L to
27.9 mg/L for the different aquatic taxanomic groups.These
values indicate that the toxicity criteria stipulated in Annex XIII are
unlikely to be met. Therefore,
this Category is not considered to be T on the basis of the screening
CAS Numbers 92045-23-3 and 95465-89-7 are
both listed in Annex I of Directive 67/548/EEC replaced by Table 3.2 in
Annex VI to CLP Annex I but are not classified for environmental
hazards. Additionally constituent substances, butane, isobutene, butene
and isobutene are listed in Annex 1 of Directive 67/548/EEC replaced by
Table 3.2 in Annex VI to CLP but are not classified for environmental
hazards. This Category would not be classified for environmental hazards.
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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