Registration Dossier
Registration Dossier
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EC number: 232-263-4 | CAS number: 7803-62-5
Density
Administrative data
Link to relevant study record(s)
- Endpoint:
- density, other
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Principles of method if other than guideline:
- The density of the submission substance has been calculated using the Ideal Gas Law and the molecular weight of the substance.
- Type of method:
- other: Calculation method based on Ideal Gas Law
- Key result
- Type:
- density
- Density:
- 1.33 kg/m³
- Temp.:
- 20 °C
- Conclusions:
- A density of 1.33 kg/m3 at 20°C has been calculated for the substance using Ideal Gas Law and the molecular weight of the substance. The result is considered to be reliable.
Reference
The density of the submission substance has been estimated by calculation based on its molecular weight and the Ideal Gas Law.
At 20°C and 1013 hPa, the volume of 1 mole of an Ideal Gas is: nRT / P = 0.0241 m3
where:
n = number of mole (n = 1 mole)
R = gas constant (8.314 J/K/mol)
T = temperature (293.15 K)
P = pressure (101,300 Pa)
The molecular weight of silane is 32.12 g/mol.
Therefore, the calculated density of silane at 20°C is 32.12 / 0.0241 = 1330 g/m3 = 1.33 kg/m3
At 20°C, the calculated density for the submission substance is 1.33 kg/m3
Description of key information
Density: 1.33 kg/m3 at 20°C (calculation)
Key value for chemical safety assessment
- Relative density at 20C:
- 1.33
Additional information
In accordance with Column 2 of REACH Annex VII, the density study does not need to be conducted as the substance is a gas at standard temperature and pressure.
However, the density of the submission substance has been estimated by calculation based on its molecular weight and the Ideal Gas Law.
At 20°C and 1013 hPa, the volume of 1 mole of an Ideal Gas is: nRT / P = 0.0241 m3
where:
n = number of moles (n = 1 mole)
R = gas constant (8.314 J/K/mol)
T = temperature (293.15 K)
P = pressure (101,300 Pa)
The molecular weight of silane is 32.12 g/mol.
Therefore, the calculated density of silane at 20°C is 32.12 / 0.0241 = 1330 g/m3 = 1.33 kg/m3
At 20°C, the calculated density for the submission substance is 1.33 kg/m3
In available handbooks or collections of reliable data which have been subject to peer-review and in which the original sources are traceable, a density value of 1.313 g/L at 25°C (= 1.313 kg/m3) and a relative density of 0.68 at -185°C (the freezing point of silane) were reported for the substance.
In a secondary source to which reliability could not be assigned, a density value of 1.44 g/L was reported for the 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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