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Diss Factsheets
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EC number: 270-724-1 | CAS number: 68477-33-8 A complex combination of hydrocarbons from the distillation of saturated and unsaturated hydrocarbons usually ranging in carbon numbers from C3 through C6, predominantly butane and isobutane. It consists of saturated and unsaturated hydrocarbons having carbon numbers in the range of C3 through C4, predominantly isobutane.
- 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
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Vapour pressure data were read across from the butene substances (2-methylpropene, but-1-ene and 2-butene) to members of the C4, high 1,3 -butadiene (≥ 0.1%) category. The vapour pressures ranged from 484 to 1160 kPa at 25°C.
Key value for chemical safety assessment
- Vapour pressure:
- 837.25 kPa
- at the temperature of:
- 25 °C
Additional information
Vapour pressure data were read across from the butene substances (2-methylpropene: 1160 kPa at 25°C, but-1-ene: 1100 kPa at 25°C and 2-butene: 484 to 605 kPa at 25°C) for members of the category. The data were taken from the CRC handbook (Lide 2008), which is peer reviewed and considered a reliable source. The substances are C4 hydrocarbons and have a similar structure to the members of the category C4, high 1,3 -butadiene (≥0.1%). Due to their similar structures, they can be predicted to have similar physico-chemical properties and so read across from the butene substances is considered acceptable. The vapour pressure ranged from 484 to 1160 kPa at 25°C, and this range is considered to be representative of category C4, high 1,3 -butadiene (≥0.1%).
The mean of the vapour pressure values for the category is 837.25 kPa at 25°C and this has been used to complete the 'key value for chemical safety assessment'.
In the ECETOC TRA, any substance with a vapour pressure higher than 10 kPa is assigned a transfer to air factor of 1 (i.e. 100%) and the substance is considered to be completely released to air instantly. This is exactly what would happen to butadiene if it was to leak or be released into the environment. Therefore the model's basic underlying assumption is applicable to our substance.
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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