Registration Dossier
Registration Dossier
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EC number: 293-263-8 | CAS number: 91053-01-9 A complex combination of hydrocarbons obtained from distillation of the butadiene-free C4 fraction of a naphtha steam-cracking process. It consists predominantly of olefinic hydrocarbons having carbon numbers of C8, C12, C16 and C20 and boiling in the range of approximately 170°C to 185°C (338°F to 365°F).
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Marine water
- Hazard assessment conclusion:
- no data available: testing technically not feasible
STP
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Sediment (freshwater)
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Sediment (marine water)
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Additional information
Conclusion on classification
The classification of the butylene oligomers is based upon the available experimental and calculated data for member streams. When experimental data are available these have been used in preference to the calculated value for that carbon number, although in most cases the calculated and experimental values are in good agreement.
The data indicate that for streams which are composed of C12 oligomers and higher then no acute effects are seen at saturation. As C12 members of this category are considered readily biodegradable then they would not have an environmental classification under the CLP Regulation. For category members with C16 +, no effects are expected at saturation and as these compounds have not been shown to be readily biodegradable and have a log Kow of >4, then the C16 streams would meet the criteria for classification as chronic category 4.
Experimental data are not available for the predominantly C8 streams in this category. Classification is therefore based on calculated data, which would result in a classification of Acute and Chronic Category 1 under the CLP Regulation, as the lowest predicted EC50 is 0.773 mg/L for Daphnia, the substance is considered not readily biodegradable and the predicted log Kow for this stream is >4. On the basis of this value, an acute M factor of 1 has been assigned. As a chronic dataset is not available, the acute M factor of 1 is applied to the chronic classification.
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