Aluminium tributanolate

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

Isoteniscope technique
At the beginning of each series of measurements the sample was refluxed in the isotensicope and the volatile impurities allowed to escape th U-tube until constant readings were obtained on balancing the pressures. This required two to four hours. At least on-half hour was allowed at each of the temperatures for attaining equlibrium and for testing. In many cases, after heating to the maximum in a series, the lower temperatures were checked again before admitting air so that many points are averages of two or more measurements. As the temperature was raised the rate of irreversible decomposition to give volatile products increased. The rate of production of volatile materials was always determined at each temperature by confining the vapors in the sample bulb and noting the increase in pressure. Vapor pressure measurements could be made within 30 seconds after allowing the vapor to bubble out of the sample bulb and measurements were discontinued when the rate of pressure increase was about one millimeter per minute.

GLP compliance:

no

Type of method:

other: Isoteniscope

Key result

Test no.:

#1

Temp.:

230.1 °C

Vapour pressure:

1.3 mm Hg

Key result

Test no.:

#2

Temp.:

240.7 °C

Vapour pressure:

2.2 mm Hg

Key result

Test no.:

#3

Temp.:

250 °C

Vapour pressure:

3 mm Hg

Key result

Test no.:

#4

Temp.:

262.7 °C

Vapour pressure:

6 mm Hg

Conclusions:

In the temperature range from 230.1°C to 262.7°C the vapor pressure increases from 1.3 mmHg to 6.0 mmHg.

Executive summary:

The vapour pressure is low and reported as max. 6.0 mm Hg at 263 °C and above. These results do correspond rather well with boiling point information derived from other sources and hence the data are useful in a weight of evidence approach indicating that the vapour pressure of the substance is very low.

Reference 2

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Guideline:

other: Reliable handbook data without information about the method.

GLP compliance:

not specified

Temp.:

20 °C

Vapour pressure:

>= 5.5 - <= 6.7 hPa

Conclusions:

The vapour pressuyre of butan-1-ol is 5.5 - 6.7 hPa at 20 °C

Description of key information

In the temperature range from 230.1°C to 262.7°C the vapor pressure of aluminium tributanolate increases from 1.3 mmHg to 6.0 mmHg. The vapour pressure of this substance is extremely low.

The vapour pressure of the hydrolysis product butan-1-ol is 5.5 -6.6 hPa at 20 °C

Key value for chemical safety assessment

Vapour pressure:

5.5 hPa

at the temperature of:

20 °C

Additional information

the value included is the vapour pressure for butan-1-ol

The vapour pressure is only meaningful in air containing moisture and thus leading to hydrolysis. Whereas aluminium(III) species used in the approach having negligible vapour pressure, butan-1-ol formed during hydrolysis has a significant vapour pressure and thus is used for risk assessment following a worst case approach