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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:
2013-10-28 to 2013-10-30
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted in accordance with a relevant test method and in compliance with a known quality system (ISO 9001:2008)
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
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.11 Pa

Results:

Table 1: raw data

Date (start

and termination)

Time (start

and termination)

Temperature

[°C]

Weight

cell 1

[g]

Weight

cell 2

[g]

Weight

cell 3

[g]

Weight

cell 4

[g]

28.10.2013

29.10.2013

9:50

9:50

20

40.27770

40.24792

37.98112

37.95384

39.04572

39.01926

39.04304

39.01870

29.10.2013

30.10.2013

9:50

8:00

30

40.24792

40.23808

37.95384

37.94614

39.01926

39.01114

39.01870

39.01040

30.10.2013

30.10.2013

8:00

15:00

40

40.23808

40.23408

37.94614

37.94334

39.01114

39.00806

39.01040

39.00726

 

Table 2: calculation of loss of masses

Temperature

[°C]

Period of

time [sec]

Calculated loss of mass [mg]

Cell 1

Cell 2

Cell 3

Cell 4

Average

20

86400

29.78

27.28

26.46

24.34

26.96

30

79800

9.84

7.7

8.12

8.3

8.49

40

25200

4.0

2.8

3.08

3.14

3.25

 

Table 3: vapour pressure

Temperature [°C]

Vapour pressure [hPa]

20

0.00111

30

0.000392

40

0.000484

 

Remarks:

At 20°C the highest value was measured. The following temperature (30°C) shows a lower vapour pressure. At 40°C the value increases again. This is the typical characteristic of a test substance which consists of several components which have different volatilities. At 20°C during the first step of the measurement more volatile components evaporate and the loss of mass corresponding to the same time range is much higher. After the first temperature step the amount of the higher volatile components is completely evaporated and the vapour pressure of the remaining substance which has a higher purity increases with higher temperature (see values at 30°C and 40°C).

 

Therefore no normal logp versus 1/T relationship is resulting. For this reason the vapour pressure of this test is only specified for 20°C, representing the property of the original substance.

Conclusions:
A vapour pressure value of 0.11 Pa at 20°C was determined for the substance using a relevant test method and in compliance with a known quality system. The result is considered to be reliable.

Description of key information

Vapour pressure [tris[3-(trimethoxysilyl)propyl]-1,3,5-triazinane-2,4,6-trione]: 0.11 Pa at 20°C (EU Method A.4)

Vapour pressure [tris[3-(trihydroxysilyl)propyl]-1,3,5-triazinane-2,4,6-trione]: <1.0E-06 Pa at 25°C (QSAR)

Vapour pressure [methanol]: 12790 Pa at 20°C

Key value for chemical safety assessment

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

Additional information

A vapour pressure value of 0.11 Pa at 20°C was determined for the substance using the effusion method: by loss of weight in accordance with EU Test Method A.4 and in compliance with a known quality system (ISO 9001:2008). The result is considered to be reliable and selected as key study.

 

In contact with water, tris[3-(trimethoxysilyl)propyl]-1,3,5-triazinane-2,4,6-trione hydrolyses rapidly to form tris[3-(trihydroxysilyl)propyl]-1,3,5-triazinane-2,4,6-trione and methanol. The vapour pressure of the silanol hydrolysis product, tris[3-(trihydroxysilyl)propyl]-1,3,5-triazinane-2,4,6-trione was predicted to be <1.0E-06 Pa at 25°C using a validated QSAR estimation method.

 

Methanol has a reported vapour pressure value of 12790 Pa at 20°C (OECD 2004).

Reference:

OECD (2004): SIDS Initial Assessment Report for SIAM 19, Berlin, Germany, 18-20 October 2004, Methanol, CAS 67-56-1.