Ethyl 3,5,5-trimethylhexanoate

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 01 June 2016 to 02 June 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

other: Isoteniscope system

Test material

Test material information

Constituent 1

Reference substance name:

Ethyl 3,5,5-trimethylhexanoate

EC Number:

266-959-4

EC Name:

Ethyl 3,5,5-trimethylhexanoate

Cas Number:

67707-75-9

Molecular formula:

C11H22O2

IUPAC Name:

ethyl 3,5,5-trimethylhexanoate

Specific details on test material used for the study:

-Performance of the Test
The vapor pressure was determined using an isoteniscope system in which the sample's vapor pressure was measured using a mercury-in-glass manometer. The temperature of the sample was regulated by use of a silicone oil bath.

A diagram of the apparatus is presented in Figure 1. The sample was placed in the isoteniscope tube such that a portion was in each of the reservoir and the U-tube. After evacuating the vacuum arm of the manometer, the sample was boiled at a suitable temperature and pressure to allow the sample to degas, any volatile impurities being distilled into the cold-finger. After removal of impurities, the temperature and pressure of the sample were altered such that data pairs were found for which the menisci formed by the sample in the two arms of the U-tube were level. At these points, the pressure of the vapor above the sample reservoir was equal to the system pressure, measurable on the manometer.

Run 1
A fresh sample of test material was degassed for 5 minutes. Temperature and pressure readings were then taken between 170 and 149 °C.

Run 2
The sample used in Run 1 was degassed for a further 5 minutes. Temperature and pressure readings were then taken between 171 and 149 °C.

Run 3
A fresh sample of test material was degassed for 6 minutes. Temperature and pressure readings were then taken between 169 and 145 °C.

Results and discussion

Vapour pressure

Key result

Temp.:

25 °C

Vapour pressure:

68.5 Pa

Any other information on results incl. tables

Summary of Vapor Pressure Data

Run	Log10[Vp(25 ºC)]
1	1.84
2	1.83
3	1.84
Mean	1.84
Vapor Pressure	68.5 Pa

Applicant's summary and conclusion

Conclusions:

The vapor pressure of the test item has been determined to be 68.5 Pa at 25 ºC.

Executive summary:

Thevapor pressureofMelusat has been determinedto be 68.5 Pa at 25 °C, using the isoteniscope method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.