Zinc EDDHA

Auto flammability

Link to relevant study record(s)

Reference

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

27 APR 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.16 (Relative Self-Ignition Temperature for Solids)

Deviations:

no

GLP compliance:

no

Relative self-ignition temperature:

395.2 °C

Remarks on result:

other: maybe a false positive result, but indicated for safety reasons

FINDINGS

Weight of cube

empty: 4.7449 g

with test item: 8.4992 g

Temperature Data

The temperatures which were measured in the experiment are presented in the following table. As many values were recorded, only the values every 60 minutes are presented.

Time [min.]	Temperature of test item [°C]	Temperature of oven [°C]
5 (Start)	22.8	21.4
60	36.4	48.5
120	64.5	83.7
180	96.9	119.5
240	134.3	155.8
300	170.6	190.7
360	210.6	222.9
420	268.2	257.8
480	285.3	289.5
540	311.1	321.1
600	346.2	356.8
660	392.5	392.3
663 (End)	400.0	395.2

After the test, the test item was nearly visually unchanged, just some parts were a bit darker.

An increase in the temperature of the test substance in comparison to that of the oven was detected; also slightly signs of ignition were observed. As these signs were only slightly and the increase was not very sharp a false positive result cannot be excluded. But for safety reasons the test item is considered as auto-flammable with a relative self-ignition Temperature of 395.2 °C under the test conditions.

Conclusions:

An increase in the temperature of the test substance in comparison to that of the oven was detected; also slightly signs of ignition were observed. As these signs were only slightly and the increase was not very sharp a false positive result cannot be excluded. But for safety reasons the test item is considered as auto-flammable with a Relative Self Ignition Temperature of 395.2 °C under the test conditions.

Executive summary:

The self-ignition temperature of the test item was assessed in a non-GLP study according to EU Method A.16. An increase in the temperature of the test substance in comparison to that of the oven was detected; also slightly signs of ignition were observed. As these signs were only slightly and the increase was not very sharp a false positive result cannot be excluded. But for safety reasons the test item is considered as auto-flammable with a Relative Self Ignition Temperature of 395.2 °C under the test conditions.

Description of key information

The self-ignition temperature of the test item was assessed in a non-GLP study according to EU Method A.16. An increase in the temperature of the test substance in comparison to that of the oven was detected; also slightly signs of ignition were observed. As these signs were only slightly and the increase was not very sharp a false positive result cannot be excluded. But for safety reasons the test item is considered as auto-flammable with a Relative Self Ignition Temperature of 395.2 °C under the test conditions.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

395.2 °C

Additional information

No pressure indicated in the study, but room conditions were available. A slight difference from the standard pressure (1013.25 hPa) does not affect the result of the study.