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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
22 January - 04 May 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
- Batch n°: M15BB1451
- Analytical purity: 98.8% (base titration)
- Expiration date: 30 January 2021
- Storage condition: at room temperature
Key result
Temp.:
20 °C
Vapour pressure:
<= 0.001 Pa
Key result
Temp.:
25 °C
Vapour pressure:
<= 0.002 Pa

Reference substances:

Validation of the method is performed at least once every year (project 512159).

Each reference substance was measured in duplicate by TGA using a temperature program that was specific for the substance. Plots of log vT obtained at elevated temperatures and 1/T were inter- or extrapolated to determine the log vT values at 20°C (log vT,20). The log vT,20 values were plotted against the logarithm of the vapour pressure at 20°C in Pascal units (log PT,20). Linear regression analysis using the least squares method yielded an equation of log PT,20= 1.14 x log vT,20 + 4.55. The coefficient of correlation (r) was > 0.99. The constants c and d specific for the experimental arrangement were 1.14 and 4.55, respectively.

Results:

From the plot of the log PT of the test item as a function of the reciprocal temperature the equation of the curve could be derived:

log PT= -5459 x 1/T + 15.61 (r = 0.997, n = 8). The results for the vapour pressure of the test item at 20°C and 25°C are:

 Temperature (°C)  log PT  PT (Pa)  PT (mm Hg)
 20  -3.01  9.7 E-4  7.3 E-6
 25  -2.70  2.0 E-3  1.5 E-5
Conclusions:
The isothermal TGA effusion method was applied for the measurement of the vapour pressure of JNJ-130806-AAA (T000750).
The vapour pressure of T000750 was determined to be <= 9.7 E-4 Pa (<= 7.3 E-6 mm Hg) at 20°C and <= 2.0 E-3 Pa (<=1.5 E-5 mm Hg) at 25°C.

Description of key information

The vapour pressure of T000750 was assessed using the isothermal TGA effusion method, following the guidelines OECD 104, EU method A.4 and EPA OPPTS 830.7950 (K1, Brekelmans, 2017). The vapour pressure of T000750 was determined to be <= 9.7 E-4 Pa at 20°C and <=2.0 E-3 Pa at 25°C.

Key value for chemical safety assessment

Vapour pressure:
0.001 Pa
at the temperature of:
20 °C

Additional information