2-benzyl-4-methyl-4a,5,6,7,8,8a-hexahydro-4H-benzo[d][1,3]dioxine

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:

14-29 June 2021

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 March 2021)

Key result

Auto-ignition temperature:

ca. 401 °C

Atm. press.:

>= 978 - <= 979 hPa

Results

Two trials were conducted. In the first one, the preselected auto-ignition temperature was set to 150°C but no ignition occurred in the +/-100°C interval, and the test stopped automatically. In the second one, the preselected auto-ignition temperature was set to 350°C. The auto-ignition of the substance was tested in varying amount of substance (between 2 and 11 droplets) and temperature (between 278.5°C and 422.5°C).

Finally, three determinations were performed and then, three lowest auto-ignition temperatures were recorded as 408°C, 408°C and 407°C using 5 droplets each.

As these temperatures did not differ by more than 2% from the mean, these results were considered as valid and the lowest value (407°C) was retained. 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).

This value was rounded to the nearest 1 °C and a final auto-ignition temperature of 401°C was obtained.

The atmospheric pressure was 978 hPa at the beginning of the test and 979 hPa at the end of the test.

Fume was observed from 230°C.

Conclusions:

The auto-ignition temperature of the substance was determined to be 401°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.

Three test series were performed, 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.

The lowest of the three value was retained, corrected for uncertainty standard and rounded to the nearest °C as described in DIN 14522, resulting in an auto-ignition temperature of 401°C.

Description of key information

Experimental AIT = 401°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:

401 °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.