Gum turpentine oil, consisting of the volatile fraction resulting from the distillation of oleoresin collected by tapping softwoods from pinacea derivatives (genus: pinus). It consists of terpenes, mainly monoterpenes such as alpha-pinene and beta-pinene.

Auto flammability

Link to relevant study record(s)

Reference

Endpoint:

auto-ignition temperature (liquids)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

21 September 2016 - 23 September 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Well documented study performed according to EU A.15 guideline, under GLP and without deviation

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

2015-03-05

Auto-ignition temperature:

ca. 250 °C

Atm. press.:

ca. 978 hPa

Remarks on result:

other: First determination

Auto-ignition temperature:

ca. 250 °C

Remarks on result:

other: Second determination

Auto-ignition temperature:

ca. 250 °C

Atm. press.:

ca. 986 hPa

Remarks on result:

other: Third determination

Key result

Auto-ignition temperature:

ca. 246 °C

Remarks on result:

other: Final value

Results (see table):

The preselected auto-ignition temperature was set to 255 °C.

Firstly, VORB program was used with an amount of 5 droplets for each test.

Ignition occured for a sample temperature of 280.0°C.

Then H-A1 program and H-A2 program were conducted.

For the first determination, H-A1 program was performed from 275 °C using 5 droplets by decreasing temperature in 5°C steps as ignition occured.

At 265 °C, ignition did not occur so the amount of test item that is injected was modified. Tests were performed with 2 and 8 droplets.

Ignition occured occured using 8 droplets and so the temperature was decreased again in 5°C steps till 255°C. Tests were then performed continuing to vary the amount of droplets till no ignition occurs whatever the amount of droplets. The last ignition occured at 250 °C using 11 droplets.

H-A2 program was then used from 248 °C using 11 droplets but no ignition occured. Test were continued, in varying the amount of droplets but no ignition occured.

The last last ignition occured at 250°C using 11 droplets and correspond to the first auto-ignition temperature (LASTIP on raw data).

For the second determination, temperature was then increased to the value obtained with VORB program (280 °C) and H-A1 program was performed using 11 droplets. The same operatory mode as for the first determination was performed and the lowest auto-ignition was found at 250 °C using 11 droplets.

A third determination was performed as for the second one and a lowest auto-ignition temperature of 250 °C with 11 droplets was found.

The lowest value (250 °C) was reduced by the absolute deviation calculated using the reproducibility value (1.5 % relative) and rounded up to the next 1 °C.

A final auto-ignition temperature (END IP VALUE in raw data) of 246 °C was obtained.

The atmospheric pressure was 978.0 hPa at the beginning of the test and 986.0 hPa at the end of the test.      

Conclusions:

According to EU method A.15, auto-ignition temperature of 246 °C was estimated for the test item.

Executive summary:

A study was performed to determine the auto-ignition Temperature of test item GUM TURPENTINE OIL. The method followed was designed to be compliant with the Council Regulation (EC) No 440/2008, Method A.15: ''Auto-ignition Temperature (Liquid and gases)''.

In this method, the auto-ignition temperature of the test item was determined by varying the temperature of the test vessel and the amount of test substance.

The lowest temperature where ignition occurs was retained and, in order to take into account all uncertainties (calibration, temperature measuring system, amount of substance etc.), this lowest value was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) as described in DIN EN 14522:2005.

A trial was conducted. The preselected auto-ignition temperature was set to 255 °C and three auto-ignition temperature were recorded (recorded as LASTIP on raw data): 250 °C, 250 °C and 250 °C.

As these three auto-ignition temperature obtained with the determination program did not differ by more than 2%, the results were validated and the lowest value (250 °C) was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) as described in DIN EN 14522:2005.

This value was rounded up to the next 1 °C and a final auto-ignition temperature (END IP VALUE in raw data) of 246 °C was obtained.

The atmospheric pressure was 978.0 hPa at the beginning of the test and 986.0 hPa at the end of the test.

Description of key information

The Self-ignition temperature of gum turpentine oil is 253°C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

253 °C

Additional information

The self-ignition temperature of GUM TURPENTINE OIL was estimated on a weight of evidence approcah, based on literature information on the substance and on experimental data on alpha-pinene, one of the main constituent of the UVCB substance.