Tributyl borate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

dynamic method

Test no.:

#1

Temp.:

65.4 °C

Vapour pressure:

15.1 hPa

Test no.:

#2

Temp.:

76.8 °C

Vapour pressure:

25 hPa

Test no.:

#3

Temp.:

104.2 °C

Vapour pressure:

50 hPa

Test no.:

#4

Temp.:

114 °C

Vapour pressure:

64.9 hPa

Test no.:

#5

Temp.:

121.6 °C

Vapour pressure:

90.1 hPa

Test no.:

#6

Temp.:

133.7 °C

Vapour pressure:

114.8 hPa

Test no.:

#7

Temp.:

138.3 °C

Vapour pressure:

100.1 hPa

Test no.:

#8

Temp.:

127.1 °C

Vapour pressure:

74.7 hPa

Test no.:

#9

Temp.:

106.3 °C

Vapour pressure:

59.7 hPa

Thermal Stability

The DSC run in a closed glass crucible under air is attached ('Attached background material'). The test item Tributyl borate showed an exothermic effects in the temperature range of 150 – 220 °C, with a decomposition energy of of -30 J/g.

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 65.4 to 138.3 °C. The measured vapour pressure values together with the measured temperatures are listed above ('Vapour pressure'); the vapour pressure curve (log p versus 1/T) is attached ('Attached background material').

From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation

log₁₀ p = A +  B / (C+θ)

can be derived by regression (Microsoft Excel) of the data points to

A = 7.9502

B = -1601.68

C = 273.15.

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.

Conclusions:

- 3.07 hPa at 20°C
- 3.79 hPa at 25°C
- 9.86 hPa at 50°C

Executive summary:

The vapour pressure of the test item Tributyl borate was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006):

Temperature / °C	Vapour pressure / hPa
20	3.07
25	3.79
50	9.86

Description of key information

Vapour pressure of Tributyl borate (determined using EU Method A.4, dynamic method):

- 3.07 hPa at 20°C

- 3.79 hPa at 25°C

- 9.86 hPa at 50°C

Key value for chemical safety assessment

Vapour pressure:

3.79 hPa

at the temperature of:

25 °C