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Physical & Chemical properties

Auto flammability

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Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
06-14 November 2017
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. The substance is considered to be adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Version / remarks:
2008
Deviations:
no
Qualifier:
according to
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
Version / remarks:
The study was performed closely following the standard DIN 51794:2003-05
Deviations:
no
Principles of method if other than guideline:
not applicable
GLP compliance:
yes (incl. certificate)
Remarks:
inspected on 20 and 21 June 2017 / signed on 04 September 2017
Key result
Auto-ignition temperature:
350 °C
Atm. press.:
>= 1 007.3 - <= 1 019.4 hPa

Results of the preliminary test:

Temperatures where auto-ignition was detected are marked with +; temperatures where no auto-ignition was detected are marked with - in the table below. The amount of test item tested at each measurement is indicated as numbers of portions (1 portion: approximately 0.1 g).

Table1: Auto-ignition temperature (preliminary test)

Preliminary test

T / °C

portions

+ / -

Time lag / s

202

5

-

-

252

5

-

-

302

5

-

-

352

5

-

-

402

5

+

3

372

5

+

3

barometric pressure: 1016.5 hPa

The lowest auto-ignition temperature of the test item was determined to be 372 °C in the preliminary test.

Results of the Main tests:

Table 2: Auto-ignition temperature (summary)

Main test series  Auto-ignition temperature / °C Portions Time lag / s Barometric pressure / hPa
1st main test (5K) 352 7 3 1011,0 - 1015,6
1st main test (2K) 352 7 3 1016,1
2nd main test (2K) 357 7 35 1007,3 - 1010,8
3rd main test (2K) 358 7 3 1019,4

The lowest auto-ignition temperature of the test item was determined to be 352 °C in the main test.

The auto-ignition-temperatures were above 300 °C and the three lowest results of the tests with 2 K steps were within a range of 20 K. Therefore, the results were considered as valid.

Due to safety reasons and according to the guidelines the lowest measured temperature at which an ignition was observed was rounded to the next lower number divisible by 5, giving a value of 350 °C (1007.3 -1019.4 hPa)

Conclusions:
This parameter/method is not relevant for classification, however the information is useful regarding potential additional fire hazard. No particular hazard is anticipated in normal conditions of storage.
Executive summary:

The study was conducted under GLP according to standard DIN 51794:2003 -05 (listed in EU A.15 guideline).

Under the test conditions, the lowest temperature that will result in the ignition of the test item after being injected into the apparatus was determined as 350 °C between 1007 and 1019 hPa. This value was determined using approximately 0.7g of test substance. The test substance showed auto ignition after 3 seconds.

Endpoint:
relative self-ignition temperature (solids)
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is a solid having a melting point <= 160°C
Justification for type of information:
JUSTIFICATION FOR DATA WAIVING
In accordance with column 2 of REACh Annex VII, the study does not need to be conducted if the substance is a solid having a melting point ≤ 160°C.
As presented under section 4.1 and 4.2, the substance is described as a dark brown solid with a melting point between 16.4°C and 36.8 °C (and it is flowable at a temperature from 65-70°C as reported in the flowability pre-test described in the relative density study (see endpoint 4.4)). Therefore no test to determine self-ignition temperature (for solids) is required.

Note also that in the ECHA endpoint specific guidance on information requirements (R.7a, v6.0, July 2017, §R.7.1.12), "solids are considered under self heating substances" and "the UN Test N.4 is preferable to generate the information for this endpoint."
Considering the substance as a solid, self-heating properties (and UN Test N.4) should be considered instead of relative self-ignition temperature and this endpoint was considered in this dossier (see endpoint 4.13).

Description of key information

Considering the physical state of the substance (solid with a low melting point at ambient temperature), two tests were taken intoaccount to evaluate the auto-flammability properties of the substance:

The self-ignition temperature was waived because the substance is a solid with a melting point ≤ 160°C.

The auto-ignition temperature of the test item is stated as 350 °C (1007 -1019 hPa).

No particular hazard is anticipated in normal conditions of storage

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
350 °C

Additional information

A GLP fully reliable experimental study, conducted according to a recognized EU/DIN method, is available. Therefore, it is considered as a key study. 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