Balmywood

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:

March 24-25, 2022

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

The study was conducted according to an internationally recognised method, and under GLP. No deviation affected the quality of the study. The substance is adequately identified. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

DIN EN 14522, Method S (Determination of the auto ignition temperature of gases and vapours)

Version / remarks:

2005-12

Deviations:

no

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

GIPC GLP compliance (inspected on 18 -20 August 2020, signed on 17 Mars 2021)

Key result

Auto-ignition temperature:

640 °C

Atm. press.:

>= 979 - <= 981 hPa

Remarks on result:

other: As described in DIN EN 14522:2005, the final auto-ignition temperature was obtained in reducing the retained value by the absolute deviation calculated using the reproducibility value (1.5% relative) and rounded to the nearest 1 °C.

Apparatus Control:

The apparatus control was validated as the lowest auto-ignition temperature measured for each reference substance did not differ by more than 1.5% from the reference value.

Results

Four trials were conducted. In the first one, the preselected auto-ignition temperature was set to 150°C but no ignition occurred and the test stopped automatically. In the second one, the preselected auto-ignition temperature was set to 350°C but a “NoDrps” message appeared and the test stopped due to a compatibility issue between the test item and the tube used (acetone-resistant). The tube was replaced with a Viton one and a new trial with a preselected auto-ignition temperature of 350°C was launched but no ignition occurred and the test stopped automatically. A fourth trial with a preselected auto-ignition temperature of 550°C was launched but no ignition occurred and the test stopped automatically.
As no auto-ignition temperature was detected up to 650°C (temperature limit of the apparatus), a lower value can be given. Considering all the uncertainties (calibration, temperature measuring system, amount of substance etc.), the highest tested temperature (650°C) is reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) as described in DIN EN 14522:2005.
Therefore, the auto-ignition temperature was estimated to be upper than 640°C.
The atmospheric pressure was 981 hPa at the beginning of the test and 979 hPa at the end of the test.

Fume was observed from 155°C.

Conclusions:

The auto-ignition temperature of the substance was determined to be 640°C.
This parameter is not relevant for classification; however the information is useful regarding process safety and potential additional fire hazard.
No particular hazard is anticipated in normal conditions of storage.

Executive summary:

The auto-ignition temperature of the test substance was measured, under GLP, according to EU A15 guideline and DIN 14522 standard, method S.

Four trial were conducted, where different volumes of test substance were injected into a heated flask, until the lowest temperature at which ignition occurs was determined. The relevant parameters were recorded for the final result.

No ignition occurred during these trials. To estimate a lower value of auto-ignition temperature, the highest value (650°C tested during the fourth trial) was manually reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) and rounded to the nearest 1 °C.
A final auto-ignition temperature of 640°C was calculated.

Description of key information

Experimental AIT = 640°C.
No particular hazard is anticipated in normal conditions of storage.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

640 °C

Additional information

A fully reliable experimental study, conducted according to a recognized DIN/EU method and under GLP, is available. It is considered as a key study, and the result is retained as key data.

This parameter is not relevant for classification, however the information is useful regarding process safety and potential additional fire hazard.