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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
30 November 2018 to 27 May 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
March 04, 2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
March 23, 2006
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
Specific details on test material used for the study:
Appearance: White powder
Purity/Composition: 99.72%
Test item storage: At room temperature desiccated
Key result
Temp.:
20 °C
Vapour pressure:
<= 0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
<= 0 Pa

A representative weight loss curve of the test item is shown in Figure 4.  The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in Table 2 and Table 3.

The vapour pressure regression curve of the log PT of the test item as function of the reciprocal temperatures is shown in Figure 5.  The equation of the curve was: log PT = -5909 × 1/T + 15.49 (r = 0.9993, n = 8).

Table 2       

Results of the Vapour pressure Isothermal TGA Analysis

Temperature [°C] Weight loss [µg/min] νT[g/cm2/h] log νT log PT PT[Pa]
140 7.49529 8.95´10-4 -3.05 1.2 16
7.1346 8.52´10-4 -3.07 1.17 15
150 13.8188 1.65´10-3 -2.78 1.54 34
13.355 1.59´10-3 -2.8 1.52 33
160 24.9888 2.98´10-3 -2.53 1.86 73
23.9414 2.86´10-3 -2.54 1.84 69
170 43.8606 5.21´10-3 -2.28 2.17 1.5´102
41.3838 4.94´10-3 -2.31 2.14 1.4´102

Table 3       

Vapour Pressure of the Test Item

Temperature [°C] log PT PT[Pa] PT[mm Hg]
20 -4.67 2.2´10-5 1.6´10-7
25 -4.33 4.7´10-5 3.5´10-7
Conclusions:
The isothermal TGA effusion method was applied for the determination of the vapour pressure of 4-Hydroxy-benzophenone.
The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:

20°C: ≤ 2.2E-5 Pa; ≤ 1.6E-7 mmHg

25°C: ≤ 4.7E-5 Pa; ≤ 3.5E-7 mm Hg

The weight losses of the test item were obtained with a temperature program of 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) could be slightly overestimated.
Executive summary:

In this guideline (OECD 104) study conducted with GLP certification, the test material (EC 214-507-1) was determined to have the following vapour pressures:

  20°C 25°C
[Pa] [mm Hg] [Pa] [mm Hg]
Test item ≤ 2.2´10-5 ≤ 1.6´10-7 ≤ 4.7´10-5 ≤ 3.5´10-7

Description of key information

Study conducted to recognised testing guidelines with GLP certification.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:

  20°C 25°C
[Pa] [mm Hg] [Pa] [mm Hg]
Test item ≤ 2.2× 10-5 ≤ 1.6× 10-7 ≤ 4.7× 10-5 ≤ 3.5× 10-7