Butyltris[(2-ethyl-1-oxohexyl)oxy]stannane

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

11 September 2017 to 19 September 2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

2006

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Version / remarks:

1996

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: OECD Test Guideline 113 Thermal Stability

Version / remarks:

1981

Deviations:

no

GLP compliance:

no

Type of method:

effusion method: vapour pressure balance

Key result

Temp.:

20 °C

Vapour pressure:

0.32 Pa

Key result

Temp.:

25 °C

Vapour pressure:

0.47 Pa

Key result

Temp.:

50 °C

Vapour pressure:

2.44 Pa

- In the DSC runs PN 14225 and PN 14228 in closed glass crucibles the test material showed a small exothermic effect in the temperature range of 160 – 210 °C, with a maximum decomposition energy of -20 J/g. An endothermic effect was observed in in the temperature range of 310 – 370 °C. The course of the DSC signal from above 390 °C can be assigned to a pressure rise inside the crucible, due to the vapour pressure of the test material. In the DSC run PN 14481 in a closed gold plated stainless steel crucible the test material showed two exothermic effects in the temperature range of 130 – 240 °C and of 440 – 480 °C, with an overall decomposition energy of -30 J/g. An endothermic effect was observed in in the temperature range of 320 – 360 °C.

The results of the DSC-measurements are summarized in Table1.

Table 1: Results of the DSC-measurements

No.	Crucible material	Sample weight (mg)	Start of effect (°C)	Energy (J/g)
PN 14225	Glass	9.22	160 310	-10 (exothermic) +50 (endothermic)
PN 14228	Glass	7.90	170 320	-20 (exothermic) +60 (endothermic)
PN 14481	Gold plated stainless steel	6.46	170 260 320	-20 (exothermic) -10 (exothermic) +50 (endothermic)

- The vapour pressure was measured in the temperature range of 28 to 48 °C. The measured vapour pressure values together with the measured temperatures are listed in Table 2:

Table 2: Results of the Effusion Method

No.	Temperature (°C)	Vapour Pressure (Pa)
1	28	0.59
2	33	0.76
3	38	1.16
4	43	1.62
5	48	2.11

 

- The measured vapour pressures in the temperature range of 38 to 48 °C are slightly outside the measuring range (10^-3 to 1 Pa) of the vapour pressure balance. Nevertheless as the vapour pressure values above 1 Pa could be detected properly by the vapour pressure balance, the values can be used for the evaluation.

- From the measured data points of the vapour pressure curve, the constants A and B of the Antoine equation: log10 p = A + (B/T) = A + (B/ C +ϴ)  can be derived by regression of the data points to A = 8.9680, B = -2773.06 and C = 273.15.

- The vapour pressure of the test material calculated by interpolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C was 0.32, 0.47 and 2.44 Pa, respectively.

Conclusions:

Under the conditions of this study, the vapour pressure of the test material at 20, 25 and 50 °C was 0.32, 0.47 and 2.44 Pa, respectively.

Executive summary:

The vapour pressure of the test material was determined in accordance with the standardised guidelines OECD 104, EU Method A.4 and EPA ECSPP 830.7950.

The test material was brought into the sample chamber of the equipment the evening before the test and left under vacuum (approximately 10^-4 Pa) at room temperature overnight to degass/dry the test material. The measurement was then carried out once the required vacuum had been obtained (approximately 10^-4 Pa) and the refrigeration box had been cooled with liquid nitrogen. The series of measurements commenced at the lowest desired measuring temperature. The orifice was opened for a certain time and the increase of weight on the balance pan was measured. Taking into account the geometry of the vapour pressure balance, physical data of the test material and the evaporation rate Δm/Δt the vapour pressure was calculated. For further measurements, the temperature was increased in small intervals until the maximum desired temperature value was reached. The vapour pressure was determined for five temperatures. With the vapour pressure balance method the vapour pressure can be measured in the temperature range 15 to 150 °C and in the pressure range 10^-3 to 1 Pa.

Under the conditions of this study, the vapour pressure of the test material at 20, 25 and 50 °C was 0.32, 0.47 and 2.44 Pa, respectively.

Description of key information

Under the conditions of the study, the vapour pressure of the test material at 20, 25 and 50 °C was 0.32, 0.47 and 2.44 Pa, respectively.

Key value for chemical safety assessment

Vapour pressure:

0.47 Pa

at the temperature of:

25 °C

Additional information

The vapour pressure of the test material was determined in accordance with the standardised guidelines OECD 104, EU Method A.4 and EPA ECSPP 830.7950. The study was awarded a reliability score of 2 in accordance with the criteria set forth by Klimisch et al. (1997).

The test material was brought into the sample chamber of the equipment the evening before the test and left under vacuum (approximately 10^-4 Pa) at room temperature overnight to degass/dry the test material. The measurement was then carried out once the required vacuum had been obtained (approximately 10^-4 Pa) and the refrigeration box had been cooled with liquid nitrogen. The series of measurements commenced at the lowest desired measuring temperature. The orifice was opened for a certain time and the increase of weight on the balance pan was measured. Taking into account the geometry of the vapour pressure balance, physical data of the test material and the evaporation rate Δm/Δt the vapour pressure was calculated. For further measurements, the temperature was increased in small intervals until the maximum desired temperature value was reached. The vapour pressure was determined for five temperatures. With the vapour pressure balance method the vapour pressure can be measured in the temperature range 15 to 150 °C and in the pressure range 10^-3 to 1 Pa.

Under the conditions of the study, the vapour pressure of the test material at 20, 25 and 50 °C was 0.32, 0.47 and 2.44 Pa, respectively.