Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 906-484-8 | CAS number: -
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
The main component DIPE has a high Henry’s law constant at 20°C: the measured value for DIPE is 173 Pa m3/mol or 0.0709 (dimensionless). The estimated value for 2-methylpent-2-ene is > 20000 Pa m3/mol or > 8 (dimensionless). An overall Henry’s law constant (H) calculated from the parameters used for exposure assessment is 420 Pa m3/mol (at 20°C).
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 420
- at the temperature of:
- 20 °C
Additional information
The main component DIPE has a high Henry’s law constant at 20°C: the measured value for DIPE is 173 Pa m3/mol or 0.0709 (dimensionless) [1]. The estimated value for 2-methylpent-2-ene is > 20000 Pa m3/mol or > 8 (dimensionless) using the HENRYWIN (v3.20) routine of Episuite [2] or equation R.16-4 of the TGD IR & CSA R16, 2010. An overall Henry’s law constant (H) calculated from the parameters used for exposure assessment is 420 Pa m3/mol (at 20°C).
According to the TGD IR & CSA R7a (2008, p.191), chemicals with H values around 100 Pa m3/mol are considered to volatilise rapidly.
[1] Arp PH & Schmidt TC, Air-Water Transfer of MTBE, Its Degradation Products, and Alternative Fuel Oxygenates: The Role of Temperature, Environ Sci Technol. 2004 Oct 15;38(20):5405-12
[2] EPI SuiteTM (2000 - 2008). Estimation Program Interface Suite, version 4.0. Syracuse Research Corporation, Syracuse, NY, USA.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
