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EC number: 237-016-4 | CAS number: 13586-84-0
- 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
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- Additional toxicological data

Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Justification for type of information:
- JUSTIFICATION FOR READING ACROSS INFORMATION FOR VAPOUR PRESSURE
The vapour pressure of a substance is defined as the saturation pressure above a solid or liquid substance. In EU method A.4, seven different measuring methods are listed for the measurement of the vapour pressure of solids and liquids. However, the vapour pressure does not need to be measured due to technical reasons if calculations indicate that the value is significantly less than 10^-5 Pa. Stearic acid, cobalt salt is a waxy solid substance (salts of an organic acid and an inorganic cation) with a melting range of 78-82 °C. In view of this, the volatility of this substance can therefore be safely assumed to be negligible, i.e. below the level of significance (10^-5 Pa). For purposes of comparison, an atom fragment contribution method (MPBPVP™, Mean VP of Antoine and Grain method; EPI Suite™) stated following experimental determined and estimated vapour pressures for the fatty acid at 25°C (please refer to the respective study records): C16: palmitic acid (CAS # 57-10-3) at 25 °C: exp. database: 3.80E-7 mm Hg (5.07-5 Pa); estimate: 5.52E-5 mm Hg (0.00736 Pa) C17: heptadecanoic acid (CAS # 506-12-7) at 25 °C: exp. database: 6.23E-8 mm Hg (8.31E-6 Pa); estimate: 0.2782.84E-5 mm Hg (0.00379 Pa) C18: stearic acid (CAS # 57-11-4) at 25 °C: exp. database: 7.22E-7 mm Hg (9.63E-5 Pa); estimate: 8.31E-6 mm Hg (0.00111Pa). Since the vapour pressure of a substance depends among others on the chemical structure and decreases with increasing inter- and intramolecular interactions. An ionic compound such as Stearic acid, cobalt salt shows a higher strength of attraction, because of the electrostatic interaction between its positive and negative ions. This ionic interaction leads to a higher lattice energy compared with the van-der-Waals interaction of the uncharged fatty acid and consequently to a much lower vapour pressure.
1. HYPOTHESIS FOR THE ANALOGUE APPROACH
Based on the above, the vapour pressure of Stearic acid, cobalt salt is considered to be negligible based on the fact that
(i) the vapour pressure of the corresponding acid is already very low (see above) and
(ii) the vapour pressure of the corresponding ionic species is considered to be magnitudes lower since the ionic bond strength is higher compared to the Van-der-Waals interactions of the uncharged molecule. In consideration of the ionic nature of this compound, it can therefore be anticipated that the vapour pressure of Stearic acid, cobalt salt is well below the value for the organic acid, and thus negligible.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Source: palmitic acid, heptadecanoic acid, stearic acid (see source study records; purity is not of relevance for this endpoint)
Target: stearic acid, cobalt salt (purity is not of relevance for this endpoint)
3. ANALOGUE APPROACH JUSTIFICATION
see justification given above
4. DATA MATRIX
not required - Reason / purpose for cross-reference:
- read-across: supporting information
- Reason / purpose for cross-reference:
- read-across: supporting information
- Reason / purpose for cross-reference:
- read-across: supporting information
- GLP compliance:
- not specified
- Type of method:
- other: not specified
- Remarks on result:
- other: please refer to the field `Justification for type of information´
- Conclusions:
- The vapour pressure of a substance is defined as the saturation pressure above a solid or liquid substance. In EU method A.4, seven different measuring methods are listed for the measurement of the vapour pressure of solids and liquids. However, the vapour pressure does not need to be measured due to technical reasons if calculations indicate that the value is significantly less than 10^-5 Pa. Stearic acid, cobalt salt is a waxy solid substance (salts of an organic acid and an inorganic cation) with a melting range of 78-82 °C. In view of this, the volatility of this substance can therefore be safely assumed to be negligible, i.e. below the level of significance (10^-5 Pa). For purposes of comparison, an atom fragment contribution method (MPBPVP™, Mean VP of Antoine and Grain method; EPI Suite™) stated following experimental determined and estimated vapour pressures for the fatty acid at 25°C (please refer to the respective study records): C16: palmitic acid (CAS # 57-10-3) at 25 °C: exp. database: 3.80E-7 mm Hg (5.07-5 Pa); estimate: 5.52E-5 mm Hg (0.00736 Pa) C17: heptadecanoic acid (CAS # 506-12-7) at 25 °C: exp. database: 6.23E-8 mm Hg (8.31E-6 Pa); estimate: 0.2782.84E-5 mm Hg (0.00379 Pa) C18: stearic acid (CAS # 57-11-4) at 25 °C: exp. database: 7.22E-7 mm Hg (9.63E-5 Pa); estimate: 8.31E-6 mm Hg (0.00111Pa). Since the vapour pressure of a substance depends among others on the chemical structure and decreases with increasing inter- and intramolecular interactions. An ionic compound such as Stearic acid, cobalt salt shows a higher strength of attraction, because of the electrostatic interaction between its positive and negative ions. This ionic interaction leads to a higher lattice energy compared with the van-der-Waals interaction of the uncharged fatty acid and consequently to a much lower vapour pressure.
Based on the above, the vapour pressure of Stearic acid, cobalt salt is considered to be negligible based on the fact that
(i) the vapour pressure of the corresponding acid is already very low (see above) and
(ii) the vapour pressure of the corresponding ionic species is considered to be magnitudes lower since the ionic bond strength is higher compared to the Van-der-Waals interactions of the uncharged molecule. In consideration of the ionic nature of this compound, it can therefore be anticipated that the vapour pressure of Stearic acid, cobalt salt is well below the value for the organic acid, and thus negligible.
In conclusion, the conduct of further experimental verification is considered to be neither technically nor scientifically feasible, and for the reasons stated above derogation from testing is hereby applied for.
Reference
Description of key information
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
This `key value for chemical safty assessment´ stated above is only used for CHESAR calculations.
The vapour pressure of a substance is defined as the saturation pressure above a solid or liquid substance. In EU method A.4, seven different measuring methods are listed for the measurement of the vapour pressure of solids and liquids. However, the vapour pressure does not need to be measured due to technical reasons if calculations indicate that the value is significantly less than 10^-5 Pa. Stearic acid, cobalt salt is a waxy solid substance (salts of an organic acid and an inorganic cation) with a melting range of 78-82 °C. In view of this, the volatility of this substance can therefore be safely assumed to be negligible, i.e. below the level of significance (10^-5 Pa). For purposes of comparison, an atom fragment contribution method (MPBPVP™, Mean VP of Antoine and Grain method; EPI Suite™) stated following experimental determined and estimated vapour pressures for the fatty acid at 25°C (please refer to the respective study records): C16: palmitic acid (CAS # 57-10-3) at 25 °C: exp. database: 3.80E-7 mm Hg (5.07-5 Pa); estimate: 5.52E-5 mm Hg (0.00736 Pa) C17: heptadecanoic acid (CAS # 506-12-7) at 25 °C: exp. database: 6.23E-8 mm Hg (8.31E-6 Pa); estimate: 0.2782.84E-5 mm Hg (0.00379 Pa) C18: stearic acid (CAS # 57-11-4) at 25 °C: exp. database: 7.22E-7 mm Hg (9.63E-5 Pa); estimate: 8.31E-6 mm Hg (0.00111Pa). Since the vapour pressure of a substance depends among others on the chemical structure and decreases with increasing inter- and intramolecular interactions. An ionic compound such as Stearic acid, cobalt salt shows a higher strength of attraction, because of the electrostatic interaction between its positive and negative ions. This ionic interaction leads to a higher lattice energy compared with the van-der-Waals interaction of the uncharged fatty acid and consequently to a much lower vapour pressure.
Based on the above, the vapour pressure of Stearic acid, cobalt salt is considered to be negligible based on the fact that
(i) the vapour pressure of the corresponding acid is already very low (see above) and
(ii) the vapour pressure of the corresponding ionic species is considered to be magnitudes lower since the ionic bond strength is higher compared to the Van-der-Waals interactions of the uncharged molecule. In consideration of the ionic nature of this compound, it can therefore be anticipated that the vapour pressure of Stearic acid, cobalt salt is well below the value for the organic acid, and thus negligible.
In conclusion, the conduct of further experimental verification is considered to be neither technically nor scientifically feasible, and for the reasons stated above derogation from testing is hereby applied for.
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