Resin acids and Rosin acids, esters with trimethylolpropane

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25 July 2015 - 31 July 2017

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:

effusion method: vapour pressure balance

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Batch No.of test material: AN-0400-105
- Expiration date of the lot/batch: 01 January 2019
- Purity: 100% UVCB

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Approximately -20 °C, under nitrogen, in the dark

Key result

Test no.:

#10

Temp.:

25 °C

Vapour pressure:

< 0.001 Pa

The test substance did not change in appearance under the conditions used in the determination.

No statistical analysis was performed since the balance readings wee too low and variable for a line of best fit to have any meaning.

Conclusions:

The vapour pressure of the test substance was determined to be less than 1.4 x10 ^-3 Pa at 25°C.

Executive summary:

The vapour pressure of the test substance, Resin acids and Rosin acids, ester with trimethylolpropane, was determined using a vapour pressure balance via a procedure 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.

The temperature of the sample was electronically controlled and the mass and temperature readings were recorded automatically into a computer file. After evacuating the system, the opening of the shutter above the sample oven caused the escaping vapour jet to be directed at the scale pan. Therefore, any differences in mass readings with the orifice covered and uncovered is proportional to the vapour pressure a the given oven temperature.

A preliminary run was carried out over a temperature range of 20 -70°C. A sequence of runs was started after a sample of the test substance had been under vacuum for approximately 48.25 hours and then temperature and pressure readings were recorded between 40 -50°C with a one hour dwell at 40°C between runs.

No statistical analysis was performed since the balance readings were too low and variable for a line of best fit to have any meaning and instead it was decided to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25°C.

Run 10 was chosen since this sample had been under vaccum for the longest period and so degassing would have been the most complete. The reading at 41°C (314K) was chosen as it gives the highest estimated vapour pressure at any given temperature when a slope of -1500K is imposed. Extrapolation to 25°C gave a vapour pressure of 1.34 x10^-3 Pa, which has been taken as a maximum value for the test substance.

In conclusion, the vapour pressure of the test substance was determined to be less than 1.4 x10^-3 Pa at 25°C.

Description of key information

The vapour pressure of Resin acids and Rosin acids, ester with trimethylolpropane, was determined using a vapour pressure balance via a procedure 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.

According to the result of this study, the vapour pressure of the test substance was determined to be less than 1.4 x10^-3 Pa at 25°C.