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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:
Experimental starting date: 22 June 2017 and Experimental completion date: 26 June 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23 March 2006
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
25 °C
Vapour pressure:
0.002 Pa

Discussion

The test item appeared to have softened slightly under the conditions used in the determination.

No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapor pressure at 25 ºC.

Run 4 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 61 ºC (334 K) was chosen because this is the data point which gives the highest estimated vapor pressure at any given temperature when a slope of –1500 K is imposed upon it.

The value of –1500 K is an in-house value and is the shallowest slope observed whilst determining the vapor pressure on a wide range of samples using the vapor pressure balance method. Extrapolation to 25 ºC gave a vapor pressure of 2.23 x 10-3 Pa which has been taken as a maximum for this material.

The results may represent rounded values obtained by calculations based on the exact raw data.

RESULTS:

Recorded temperatures, mass differences and the resulting calculated values of vapor pressure are shown in the following tables: Run 7

Table 1 – Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (μg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

60

333.15

0.003001651

3.69

3.690E-09

0.005122665

-2.290504013

61

334.15

0.002992668

2.46

2.460E-09

0.003415110

-2.466595272

62

335.15

0.002983739

4.25

4.250E-09

0.005900089

-2.229141449

63

336.15

0.002974862

5.46

5.460E-09

0.007579879

-2.120337736

64

337.15

0.002966039

5.37

5.370E-09

0.007454936

-2.127556093

65

338.15

0.002957267

5.09

5.090E-09

0.007066224

-2.150812596

66

339.15

0.002948548

5.06

5.060E-09

0.007024576

-2.153379862

67

340.15

0.002939879

4.29

4.290E-09

0.005955619

-2.225073087

68

341.15

0.002931262

4.78

4.780E-09

0.006635865

-2.178102482

69

342.15

0.002922695

4.77

4.770E-09

0.006621982

-2.179012000

70

343.15

0.002914177

5.08

5.080E-09

0.007052341

-2.151666666

No statistical analysis is given due to the nature of the plot.

Run 8

Table 2 – Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (μg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

60

333.15

0.003001651

3.12

3.120E-09

0.004331359

-2.363375785

61

334.15

0.002992668

4.03

4.030E-09

0.005594672

-2.252225333

62

335.15

0.002983739

4.87

4.870E-09

0.006760808

-2.170001418

63

336.15

0.002974862

4.50

4.500E-09

0.006247153

-2.204317865

64

337.15

0.002966039

4.53

4.530E-09

0.006288801

-2.201432177

65

338.15

0.002957267

5.03

5.030E-09

0.006982929

-2.155962394

66

339.15

0.002948548

5.48

5.480E-09

0.007607644

-2.118749820

67

340.15

0.002939879

4.54

4.540E-09

0.006302683

-2.200474526

68

341.15

0.002931262

4.39

4.390E-09

0.006094445

-2.215065858

69

342.15

0.002922695

4.90

4.900E-09

0.006802455

-2.167334299

70

343.15

0.002914177

6.00

6.000E-09

0.008329537

-2.079379128

No statistical analysis is given due to the nature of the plot.

Run 9

Table 3 – Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (μg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

60

333.15

0.003001651

3.88

3.880E-09

0.005386434

-2.268698653

61

334.15

0.002992668

4.85

4.850E-09

0.006733043

-2.171788640

62

335.15

0.002983739

3.60

3.600E-09

0.004997722

-2.301227878

63

336.15

0.002974862

2.54

2.540E-09

0.003526171

-2.452696662

64

337.15

0.002966039

3.58

3.580E-09

0.004969957

-2.303647352

65

338.15

0.002957267

4.88

4.880E-09

0.006774690

-2.169110557

66

339.15

0.002948548

4.04

4.040E-09

0.005608555

-2.251149014

67

340.15

0.002939879

4.89

4.890E-09

0.006788573

-2.168221520

68

341.15

0.002931262

3.67

3.670E-09

0.005094900

-2.292864314

69

342.15

0.002922695

5.93

5.930E-09

0.008232359

-2.084475685

70

343.15

0.002914177

5.20

5.200E-09

0.007218932

-2.141527035

 No statistical analysis is given due to the nature of the plot.

Run 10

Table 4 – Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (μg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

60

333.15

0.003001651

3.89

3.890E-09

0.005400317

-2.267580777

61

334.15

0.002992668

5.59

5.590E-09

0.007760352

-2.110118571

62

335.15

0.002983739

4.32

4.320E-09

0.005997267

-2.222046632

63

336.15

0.002974862

4.34

4.340E-09

0.006025032

-2.220040649

64

337.15

0.002966039

3.28

3.280E-09

0.004553480

-2.341656535

65

338.15

0.002957267

3.72

3.720E-09

0.005164313

-2.286987439

66

339.15

0.002948548

4.02

4.020E-09

0.005580790

-2.253304326

67

340.15

0.002939879

3.58

3.580E-09

0.004969957

-2.303647352

68

341.15

0.002931262

3.39

3.390E-09

0.004706189

-2.327330681

69

342.15

0.002922695

4.44

4.440E-09

0.006163858

-2.210147409

70

343.15

0.002914177

3.71

3.710E-09

0.005150430

-2.288156469

No statistical analysis is given due to the nature of the plot.

Conclusions:
The vapor pressur has been determined to be less than 2.3 x 10-3 Pa at 25 °C
Executive summary:

The vapor pressure of Formaldehyde, reaction products with aniline, 4,4'-methylenebis[phenol] has been determined to be less than 2.3 x 10-3 Pa at 25 °C, using the vapor pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.

Description of key information

The vapor pressure of Formaldehyde, reaction products with aniline, 4,4'-methylenebis[phenol] has been determined to be less than 2.3 x 10-3 Pa at 25 °C, using the vapor pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.

Key value for chemical safety assessment

Vapour pressure:
0.002 Pa
at the temperature of:
25 °C

Additional information