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EC number: 205-593-1 | CAS number: 143-23-7
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2018-02-01 to 2018-03-06
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- March 23, 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- March 04, 2016
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- August 1996
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
- Key result
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- <= 0.014 Pa
- Remarks on result:
- other: extrapolated from vapour pressure curve
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- <= 0.007 Pa
- Remarks on result:
- other: extrapolated from vapour pressure curve
- Conclusions:
- The vapour pressure of the test item determined according to OECD 104 was
= 7.1E-03 Pa at 20°C (293K) and
= 1.4 E-02 Pa at 25 °C. - Executive summary:
In a valid study performed according to OECD 104 compliant with GLP, the isothermal TGA effusion method was applied for the determination of the vapour pressure of the test item Bis(hexamethylene)triamine. The weight losses of the test item were obtained at temperatures above the melting temperature of the test item. According to this, the vapour pressure of the test item (which was, according to the method, extrapolated to 20°C and 25°C) might be slightly overestimated and is therefore reported as a < value.
The vapour pressure of the test item at 20°C (293K) was < 7.1E-03 Pa and at 25 °C < 1.4 E-02 Pa.
Reference
Results
The results of the isothermal TGA analysis for the test item are given in the table below:
Results of the Vapour pressure Isothermal TGA Analysis
Temperature |
Weight loss |
¿T |
log ¿T |
log PT |
PT |
100 |
12.7210 |
1.52 x 10-3 |
-2.82 |
1.52 |
3.4 x 101 |
|
10.7528 |
1.28 x 10-3 |
-2.89 |
1.44 |
2.7 x 101 |
110 |
21.3947 |
2.55 x 10-3 |
-2.59 |
1.82 |
6.6 x 101 |
|
20.7717 |
2.48 x 10-3 |
-2.61 |
1.80 |
6.3 x 101 |
120 |
39.1699 |
4.68 x 10-3 |
-2.33 |
2.15 |
1.4 x 102 |
|
39.3628 |
4.70 x 10-3 |
-2.33 |
2.16 |
1.4 x 102 |
130 |
71.1648 |
8.49 x 10-3 |
-2.07 |
2.49 |
3.1 x 102 |
|
65.8874 |
7.86 x 10-3 |
-2.10 |
2.44 |
2.8 x 102 |
The vapour pressure regression equation
of the log PT of the test item as function of the reciprocal
temperatures is as follows:
log PT= -4954´1/T
+ 14.75 (r = 0.997, n = 8).
Accordingly, the vapour pressure at 20°C and 25°C was calculated:
Vapour Pressure of the Test Item
Temperature |
log PT |
PT |
PT |
20 |
-2.15 |
7.1 x 10-3 |
5.3 x 10-5 |
25 |
-1.86 |
1.4 x 10-2 |
1.0 x 10-4 |
Description of key information
The vapour pressure of the test item determined according to OECD 104 was
< 7.1E-03 Pa at 20°C (293K) and
< 1.4 E-02 Pa at 25 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0.014 Pa
- at the temperature of:
- 25 °C
Additional information
In a valid study performed according to OECD 104 compliant with GLP, the isothermal thermogravimetric analysis (TGA) effusion method was applied for the determination of the vapour pressure of the test itemBis(hexamethylene)triamine. The weight losses of the test item were obtained at temperatures above the melting temperature of the test item. According to this, the vapour pressure of the test item (which was, according to the method, extrapolated to 20°C and 25°C) might be slightly overestimated and is therefore reported as a = value.
The vapour pressure of the test item at 20°C (293K) was= 7.1E-03 Pa and at 25 °C = 1.4 E-02 Pa.
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