Registration Dossier
Registration Dossier
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EC number: 234-733-4 | CAS number: 12028-48-7
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
For risk assessment purposes a Henry constant of 4E-4 at 25 °C was used as recommended on the Guidance on information requirements and chemical safety assessment Appendix R.7.13-2: Environmental risk assessment for metals and metal compounds
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 0
- at the temperature of:
- 25 °C
Additional information
No data on volatilisation are available for tungsten. However, most tungsten compounds are expected to exist as ions or insoluble solids in the environment. Therefore, volatilisation from moist soil and water surfaces is not expected to be an important fate process (HSDB, 2008). Tungsten is also not expected to volatilise from dry soil surfaces based upon its ionic character and extremely low vapor pressure at environmentally relevant temperatures (1 x 10-10 Pa at 1700°C (Lassner et al, 2005) and 8.15 x 10-8 Pa at 2000°C (Lassner and Schubert, 1999).
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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