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EC number: 269-923-6 | CAS number: 68391-04-8 This substance is identified by SDA Substance Name: C12-C18 alkyl dimethyl amine and SDA Reporting Number: 16-040-00.
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- read-across based on grouping of substances (category approach)
- Adequacy of study:
- key study
- Justification for type of information:
- For details on endpoint-specific justification, please see read-across justification document (category approach) in the linked category of dimethylalkylamines.
- Type of method:
- effusion method: vapour pressure balance
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.001 Pa
- Remarks on result:
- other: RA from C18-DMA
- Temp.:
- 25 °C
- Vapour pressure:
- 0.002 Pa
- Remarks on result:
- other: RA from C18-DMA
- Temp.:
- 50 °C
- Vapour pressure:
- 0.038 Pa
- Remarks on result:
- other: RA from C18-DMA
- Executive summary:
The study used as source investigated the vapour pressure of C18-DMA according to the effusion method (vapour pressure balance; OECD 104; EU method A.4). The study results of the source substance were considered applicable to the target substance. Justification and applicability of the read-across approach (category approach) is outlined in the read-across report in the linked category of dimethylalkylamines.
- Endpoint:
- vapour pressure
- Type of information:
- read-across based on grouping of substances (category approach)
- Adequacy of study:
- key study
- Justification for type of information:
- For details on endpoint-specific justification, please see read-across justification document (category approach) in the linked category of dimethylalkylamines.
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.009 hPa
- Remarks on result:
- other: RA from C12-14-DMA
- Temp.:
- 25 °C
- Vapour pressure:
- 0.014 hPa
- Remarks on result:
- other: RA from C12-14-DMA
- Temp.:
- 50 °C
- Vapour pressure:
- 0.094 hPa
- Remarks on result:
- other: RA from C12-14-DMA
- Executive summary:
The study used as source investigated the vapour pressure of C12-14-DMA according to the dynamic method (OECD 104; EU method A.4). The study results of the source substance were considered applicable to the target substance. Justification and applicability of the read-across approach (category approach) is outlined in the read-across report in the linked category of dimethylalkylamines.
Referenceopen allclose all
Vapour Pressure Balance (Effusion Method)
The vapour pressure was measured in the temperature range of 24 °C to 73 °C. Above 24 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in the following table:
Temperature / °C |
Vapour pressure / hPa |
24.4 |
1.2× 10-5 |
29.5 |
3.2× 10-5 |
33.4 |
5.4× 10-5 |
39.2 |
1.1× 10-4 |
42.7 |
1.5× 10-4 |
47.2 |
2.8× 10-4 |
52.3 |
4.7× 10-4 |
56.4 |
7.3× 10-4 |
61.3 |
1.4× 10-3 |
66.6 |
2.3× 10-3 |
73.2 |
4.7× 10-3 |
The following vapour pressure values for the test item were extrapolated from the experimental data:
T / °C |
p / hPa |
p / Pa |
20 |
8.9× 10-6 |
8.9× 10-4 |
25 |
1.8× 10-5 |
1.8× 10-3 |
50 |
3.8× 10-4 |
3.8× 10-2 |
Vapour Pressure (Dynamic Method):
The vapour pressure was measured with the dynamic method in the temperature range of 135 °C to 269 °C.The measured vapour pressures at the corresponding temperatures are listed in the following table:
Temperature / °C |
Vapour pressure / hPa |
135.2 |
9.6 |
157.9 |
30.4 |
170.7 |
50.2 |
188.7 |
102.1 |
201.5 |
150.0 |
223.8 |
300.8 |
244.1 |
500.6 |
258.1 |
700.1 |
268.9 |
898.5 |
211.2 |
200.3 |
179.6 |
69.6 |
149.2 |
19.8 |
The Antoine constants from the regression of the data from the dynamic method were used to calculate the vapour pressure for 20, 25 and 50 °C:
T / °C |
p / hPa |
p / Pa |
20 |
9.0× 10-3 |
9.0× 10-1 |
25 |
1.4× 10-2 |
1.4 |
50 |
9.4× 10-2 |
9.4 |
Description of key information
Vapour pressure range at 20 °C:
lower range value: 0.00089 Pa at 20 °C (source C18-DMA);
upper range value: 0.9 Pa at 20 °C (source C12-14-DMA).
Key value for chemical safety assessment
- Vapour pressure:
- 0.9 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure for C12-18-DMA was determined by read-across from the nearest neighbours C12-14-DMA (0.9 Pa at 20 °C) and C18-DMA (0.00089 Pa at 20 °C).
The highest value from the resulting range was taken as the key value.
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