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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 273-282-8 | CAS number: 68955-56-6
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 0.014
- at the temperature of:
- 20 °C
Additional information
Volatilisation of organic compounds from surface waters is generally estimated by the Henry’s law constant. The Henry’s law constant for the diamines C16-18 is calculated from the ratio of the vapour pressure (Pa) and the CMC (mol/m3) as determined at pH 7. The vapour pressure of N-C12-14-alkyldiamino propane (90640-43-0) of 0.0015 Pa is used for the calculation of the Henry’s law constant for all the three technical mixtures of diamines C16-18 as a worst-case.
Table 13b: Henry’s law constants for diamines C16-18 (Pa.m3/mol)
diamine |
VP (Pa) |
CMC (mg/L) |
MW (g/mol) |
H (Pa.m3/mol) |
N-9-octa-decenyl-, (Z)- propane-1,3-diamine (7173-62-8) |
0.0015 |
36 |
324.60 (C18=) |
1.35 * 10-2 |
N-hydrogenatedC16-18-alkyl-(evennumbered)propane-1,3-diamine (68603-64-5) |
36 |
326.61 (C18) |
1.36 * 10-2 |
Considering the low values, volatilisation at environmental conditions is expected to be negligible. For the model calculations, the highest value of 1.36 * 10-2 Pa.m3/mol is used as a worst-case.
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.
