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EC number: 200-848-3 | CAS number: 75-20-7
- 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)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- other: not reported
- GLP compliance:
- not specified
- Type of method:
- other: not reported
- Key result
- Test no.:
- #1
- Temp.:
- 25 °C
- Vapour pressure:
- 0 mm Hg
- Conclusions:
- A vapour pressure value of 1.32E-033 mm Hg at 25°C is reported in a handbook or collection of reliable data (SRC PhysProp Database, 2000) which has been subject to peer-review and in which the original data sources are traceable. The result is considered to be reliable.
- Executive summary:
A vapour pressure value of 1.32E-033 mm Hg at 25°C is reported in a handbook or collection of reliable data (SRC PhysProp Database, 2000) which has been subject to peer-review and in which the original data sources are traceable. The result is considered to be reliable. In SI units this corresponds to a vapour pressure of 1.76E-31
- Endpoint:
- vapour pressure
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- As calcium carbide instantly hydrolyses to Ca(OH)2 and C2H2 upon contact with water/moisture the assessment is based on the degradation products. For details please refer to the read across report in section 13.
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Test no.:
- #1
- Temp.:
- 25 °C
- Vapour pressure:
- 40 400 mm Hg
- Remarks on result:
- other: Vapour pressure of degradation product
- Conclusions:
- Acetylene is one of the degradation products of Calcium acetylide. The vapour pressure of acetylene is 40400 mm Hg at 25 °C.
- Executive summary:
Acetylene is one of the degradation products of Calcium acetylide. The vapour pressure of acetylene as cited in the Hazardous Substances Data Bank (HSDB) is 40400 mm Hg at 25 °C. Physico-chemical data form HSDB is peer-reviewed and thus considered to be reliable.
This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.
Referenceopen allclose all
Description of key information
Calcium carbide instantly decomposes hydrolytically upon contact with water,
yielding acetylene and calcium dihydroxide. Therefore, the vapour pressures of these degradation products are the relevant parameters for the environmental risk assessment. The vapour pressure of calcium hydroxide is negligible and is not further considered. For environmental risk assessment, the vapour pressure of acetylene is considered to be the critical parameter, whereas for human health risk assessment (worker exposure to dust) calcium carbide itself will be evaluated, and the vapour pressure set to the minimum accepted value.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
For calcium carbide a vapour pressure value of 1.32E-033 mm Hg at 25°C is reported in a handbook or collection of reliable data (SRC PhysProp Database, 2000) which has been subject to peer-review and in which the original data sources are traceable. The result is considered to be reliable.
However, as the substance instantly decomposes hydrolytically upon contact with water, yielding acetylene and calcium dihydroxide, the vapour pressures of these degradation products are relevant for risk assessment.
The vapour pressure of acetylene as reported in the Hazardous Substances Data Bank (HSDB) is 4.04 x 10^4 mm Hg at 25 °C (Daubert, T.E., R.P. Danner. Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. Washington, D.C.: Taylor and Francis, 1989). This value corresponds to 53862 hPa at 25 °C.
The vapour pressure of calcium hydroxide is considered to be negligible as the substance has a melting point > 300 °C.
Thus the vapour pressure of acetylene is considered to be the critical parameter for chemical safety assessment (environment), whereas the negligible vapour pressure of calcium carbide itself is taken into account in human health risk assessment.
This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.
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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