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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:
The study was conducted between 16 July 2018 and 20 July 2018.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: vapour pressure balance
Specific details on test material used for the study:
Identification: Reaction mass of crystalline magnesium silicate and crystalline silicon and synthetic amorphous silicon dioxide
Appearance/Physical state: black powder
Lot No: Y180510A
Purity: 95%
Expiry date: 31 May 2019
Storage conditions: room temperature, in the dark
Key result
Test no.:
#10
Temp.:
25 °C
Vapour pressure:
< 0.003 Pa

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

Run 7

Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (µg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

190

463.15

0.002159

26.76

2.676e-08

0.03715

-1.43004

191

464.15

0.002154

31.25

3.125e-08

0.04338

-1.36271

192

465.15

0.002150

27.06

2.706e-08

0.03757

-1.42516

193

466.15

0.002145

27.46

2.746e-08

0.03812

-1.41885

194

467.15

0.002141

34.65

3.465e-08

0.04810

-1.31785

195

468.15

0.002136

24.86

2.486e-08

0.03451

-1.46206

196

469.15

0.002132

20.57

2.057e-08

0.02856

-1.54424

197

470.15

0.002127

31.15

3.115e-08

0.04324

-1.36411

198

471.15

0.002122

19.97

1.997e-08

0.02772

-1.55721

199

472.15

0.002118

27.46

2.746e-08

0.03812

-1.41885

200

473.15

0.002113

27.76

2.776e-08

0.03854

-1.41409

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

Run 8

Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (µg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

190

463.15

0.002159

24.46

2.446e-08

0.03396

-1.46903

191

464.15

0.002154

25.26

2.526e-08

0.03507

-1.45506

192

465.15

0.002150

26.46

2.646e-08

0.03673

-1.43498

193

466.15

0.002145

28.16

2.816e-08

0.03909

-1.40793

194

467.15

0.002141

18.97

1.897e-08

0.02634

-1.57938

195

468.15

0.002136

30.75

3.075e-08

0.04269

-1.36967

196

469.15

0.002132

15.38

1.538e-08

0.02135

-1.67060

197

470.15

0.002127

30.65

3.065e-08

0.04255

-1.37110

198

471.15

0.002122

22.56

2.256e-08

0.03132

-1.50418

199

472.15

0.002118

24.66

2.466e-08

0.03423

-1.46559

200

473.15

0.002113

32.35

3.235e-08

0.04491

-1.34766

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

Run 9

Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (µg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

190

463.15

0.002159

33.55

3.355e-08

0.04658

-1.33180

191

464.15

0.002154

34.55

3.455e-08

0.04796

-1.31912

192

465.15

0.002150

32.35

3.235e-08

0.04491

-1.34766

193

466.15

0.002145

32.15

3.215e-08

0.04463

-1.35037

194

467.15

0.002141

25.16

2.516e-08

0.03493

-1.45680

195

468.15

0.002136

22.36

2.236e-08

0.03104

-1.50808

196

469.15

0.002132

31.55

3.155e-08

0.04380

-1.35853

197

470.15

0.002127

24.66

2.466e-08

0.03423

-1.46559

198

471.15

0.002122

23.46

2.346e-08

0.03257

-1.48718

199

472.15

0.002118

37.34

3.734e-08

0.05184

-1.28534

200

473.15

0.002113

34.15

3.415e-08

0.04741

-1.32413

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

Run 10

Vapor Pressure Data

Temperature (ºC)

Temperature (K)

Reciprocal Temperature (K-1)

Mass Difference (µg)

Mass Difference (kg)

Vapor Pressure (Pa)

Log10Vp

190

463.15

0.002159

38.14

3.814e-08

0.05295

-1.27613

191

464.15

0.002154

31.85

3.185e-08

0.04422

-1.35438

192

465.15

0.002150

37.74

3.774e-08

0.05239

-1.28075

193

466.15

0.002145

27.76

2.776e-08

0.03854

-1.41409

194

467.15

0.002141

27.06

2.706e-08

0.03757

-1.42516

195

468.15

0.002136

38.54

3.854e-08

0.05350

-1.27165

196

469.15

0.002132

34.55

3.455e-08

0.04796

-1.31912

197

470.15

0.002127

33.65

3.365e-08

0.04671

-1.33059

198

471.15

0.002122

30.45

3.045e-08

0.04227

-1.37397

199

472.15

0.002118

40.54

4.054e-08

0.05628

-1.24965

200

473.15

0.002113

29.65

2.965e-08

0.04116

-1.38552

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

Conclusions:
The vapor pressure of the test item has been determined to be less than 3.4 x 10^-3 Pa at 25 ºC.
Executive summary:

The vapor pressure of Reaction mass of crystalline magnesium silicate and crystalline silicon and synthetic amorphous silicon dioxide has been determined to be less than 3.4 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(as amended) 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 Reaction mass of crystalline magnesium silicate and crystalline silicon and synthetic amorphous silicon dioxide has been determined to be less than 3.4 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(as amended) 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:
0.003 Pa
at the temperature of:
25 °C

Additional information