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Diss Factsheets
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EC number: 203-449-2 | CAS number: 106-98-9
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure of butenes was determined to be 484-1160 kPa at 25°C, depending on the isomer. The endpoint value was extrapolated from lower temperatures for the different butene structures.
Key value for chemical safety assessment
- Vapour pressure:
- 837.25 kPa
- at the temperature of:
- 25 °C
Additional information
In accordance with REACH Annex XI, this study does not need to be conducted as it is technically not possible. These substances have a vapour pressure above the limit of detection of the guideline methods. In accordance with ECHA (2008) Guidance on information requirements and chemical safety assessment chapter R.7a, the vapour pressure study is not required for a substance with a boiling point <30°C as these substances will have a vapour pressure above the limit of measurement (i.e. 10^5 Pa). As the boiling point of butenes ranges from -6.26°C to 3.71°C, this endpoint can be waived.
The waiver is supported by data from the CRC Handbook (Lide 2008) and Zwolinski and Wilhoit (1971). No information on the methods used is available. However, the information is taken from reliable peer reviewed handbooks and is considered reliable and suitable for use for this endpoint. According to the CRC Handbook, the vapour pressure of butenes was determined to be 484 kPa - 1160 kPa at 25°C. The endpoint value was extrapolated from values at lower temperatures for the different butene structures. Vapour pressure values are available for 2-methylpropene (1160 kPa at 25°C), but-1-ene (1100 kPa at 25°C) and 2-butene (484 kPa - 605 kPa at 25°C). The mean of the vapour pressure values for the butenes is 837.25 kPa at 25°C and this has been used to complete the 'key value for chemical safety assessment'.
According to Zwolinski and Wilhoit (1971), the vapour pressure of butenes was determined to be 141 kPa - 206 kPa at 12.8°C. The endpoint was determined by extrapolation using the Antonine equation. The vapour pressure at 12.8°C was determined to be 206.2 kPa for 2-methylpropene, 201.3 kPa for but-1-ene and141.3 kPa – 156.1 kPa for 2-butene.
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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