Reaction mass of Terpenes and terpenoids, turpentine-oil, beta-pinene fraction, dimers and Terpenes and terpenoids, turpentine-oil, beta-pinene fraction, trimers

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 August - 07 August 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-0400-112
- 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.:

#6

Temp.:

ca. 25 °C

Vapour pressure:

ca. 0.054 Pa

Remarks on result:

other: Runs 5-10

Transition / decomposition:

no

The vapour pressure (PA) at 298.15K was recorded for the following runs:

- Run 5 = -1.27

- Run 6 = -1.26

- Run 7 = -1.26

- Run 8 = -1.27

- Run 9 = -1.24

- Run 10 = -1.27

Table 1: Summary of vapour pressure data
Run	Log10[Vp(25°C)]
5	-1.27
6	-1.26
7	-1.26
8	-1.27
9	-1.24
10	-1.27
Mean	-1.26
Vapour pressure	5.44 x 10^-2Pa

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

- The unshaded points on the graphs have not been used as it was considered that the balance was settling after the dwell time.

- A total of 10 runs were completed for the main sequence. Equilibrium with regard to vapor pressure was assessed to have been reached over the final 6 runs. Thus the final 6 runs have been used to calculate the definitive vapor pressure value for the test substance.

- The results may represent rounded values obtained by calculations based on the exact raw data.

Conclusions:

The vapour pressure of the test substance, Terpenes and terpenoids, turpentine oil, beta-pinene fraction polymerised, was determined to be 5.4 x 10^-2 Pa at 25°C.

Executive summary:

The vapour pressure of the test substance, Terpenes and terpenoids, turpentine oil, beta-pinene fraction polymerised, was determined 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 instrument used was a Vapour pressure balance. The temperature of the sample was electronically controlled and the mass and temperature readings were recorded automatically into a computer file. Following evacuation of the system, the opening of the shutter above the sample oven causes the escaping vapour jet to be directed at the scale pan, therefore the difference in mass readings with the orifice covered and uncovered, is proportional to the vapour pressure at the given oven temperature. A preliminary run was carried out over the temperature range 25 -70°C, in order to provide information for a suitable temperature range for the determination. The test substance was placed under vacuum for approximately 70 hours and then the sequence of runs were started. Temperature and pressure readings were taken between 45 and 55°C with a one hour dwell at 45°C between runs.

The test substance did not change appearance under the conditions of the test. A total of 10 runs were carried out and equilibrium with regards to vapour pressure was thought to have been reached over the final 6 runs. Therefore the vapour pressure results were determined from the Log10 (vapour pressure (Pa) vs. 1/temperature (K) graph for each run and then the mean log 10 [Vp(25°C)] was determined from these runs and used to calculate the vapour pressure.

Based on this, the vapour pressure of the test substance was calculated to be 5.4 x 10^-2 Pa at 25°C.

Description of key information

The vapour pressure of the test substance, Terpenes and terpenoids, turpentine oil, beta-pinene fraction polymerised, was determined 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 instrument used was a Vapour pressure balance. The temperature of the sample was electronically controlled and the mass and temperature readings were recorded automatically into a computer file. Following evacuation of the system, the opening of the shutter above the sample oven causes the escaping vapour jet to be directed at the scale pan, therefore the difference in mass readings with the orifice covered and uncovered, is proportional to the vapour pressure at the given oven temperature. A preliminary run was carried out over the temperature range 25 -70°C, in order to provide information for a suitable temperature range for the determination. The test substance was placed under vacuum for approximately 70 hours and then the sequence of runs were started. Temperature and pressure readings were taken between 45 and 55°C with a one hour dwell at 45°C between runs.

The test substance did not change appearance under the conditions of the test. A total of 10 runs were carried out and equilibrium with regards to vapour pressure was thought to have been reached over the final 6 runs. Therefore the vapour pressure results were determined from the Log10 (vapour pressure (Pa) vs. 1/temperature (K) graph for each run and then the mean log 10 [Vp(25°C)] was determined from these runs and used to calculate the vapour pressure.

Based on this, the vapour pressure of the test substance was calculated to be 5.4 x 10^-2 Pa at 25°C.

Key value for chemical safety assessment

Vapour pressure:

0.054 Pa

at the temperature of:

25 °C