Registration Dossier
Registration Dossier
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EC number: 202-895-5 | CAS number: 100-85-6
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- other: statement
- Adequacy of study:
- key study
- Study period:
- May 2019
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with national standard methods with acceptable restrictions
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Argumentation provided for 'testing technically not feasible' in methanol solutions, based on melting behaviour.
- GLP compliance:
- no
- Type of method:
- other: statement based on melting behaviour in methanol solution
- Key result
- Remarks on result:
- not measured/tested
- Conclusions:
- It is considered technically not feasible to determine the vapour pressure of BTMAOH, because the substance cannot be isolated from the solvent used during manufacture and, when tested in solvent solutions, it undergoes partial decomposition in the temperature range commonly used in vapour pressure determinations by e.g. the isothermal thermogravimetric effusion method.
Reference
In view of the observed effects in DSC experiments in the temperature range 50°C and 250°C, i.e. solvent evaporation overlapping with reaction/decomposition effects of the substance, it is deemed not meaningful to perform a vapour pressure study with a solution of BTMAOH in methanol. The results would mainly reflect the vapour pressure of the solvent and/or decomposition products, and thus not provide reliable information on the vapour pressure of BTMAOH.
See attached document for more explanation.
Description of key information
It is considered technically not feasible to determine the vapour pressure of the registered substance BTMAOH, because the substance is not available as such and, when tested in solvent solutions, it undergoes partial decomposition in the temperature range commonly used in vapour pressure determinations. As key value for chemical safety assessment, a calculated value of 9.5E-05 Pa is used.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
Calculated for the 'non-salt form' of the registered substance (with an H bonded to N), by using the modified grain method in EPI Suite.
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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