2-chloro-2-methylpropane

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:

from 2017-11-17 to 2017-11-24

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

no

Key result

Auto-ignition temperature:

515 °C

Atm. press.:

1 003.3 hPa

Preliminary test

The following table shows the 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 below table. The amount of test item tested at each measurement is indicated as numbers of portions (i.e. drops). The results are summarized in Table 1.

Table 1: Auto-ignition temperature (preliminary test)

T (°C)	portions	+ / -	time lag (s)
207	5	-	-
257	5	-	-
307	5	-	-
357	5	-	-
407	5	-	-
457	5	-	-
507	5	-	-
557	5	+	10
537	5	-	-
547	5	+	26
barometric pressure: 1019.8 hPa

The lowest auto-ignition temperature of the test item was determined to be 547 °C in the preliminary test.

Main test

The following tables show the results of the main tests. Temperatures where auto-ignition was detected are marked with ’+’; temperatures where no auto-ignition was detected are marked with ’-’ in the below table. The amount of test item tested at each measurement is indicated as numbers of portions (i.e. drops). The results are summarized in Table 2 to Table 5.

Table 2: Auto-ignition temperature (1st main test, part 1)

1st main test (5 K steps)
T (°C)	portions	+ / -	time lag (s)
547	5	+	23
542	5	+	25
537	5	+	37
532	5	+	31
527	5	-	-
527	10	-	-
527	1	-	-
527	9	-	-
527	2	-	-
527	8	-	-
527	3	-	-
527	7	-	-
527	4	-	-
527	6	-	-

barometric pressure: 1014.9 hPa

Table 3: Auto-ignition temperature (1st main test, part 2)

1st main test (2 K steps)				1st main test continued (2 K steps)
T (°C)	portions	+ / -	time lag (s)	T (°C)	portions	+ / -	time lag (s)
532	5	-	-	522	8	-	-
534	5	+	30	522	3	-	-
532	5	+	31	522	7	-	-
530	5	+	32	522	4	-	-
528	5	+	25	522	6	-	-
526	5	-	-	522	5	-	-
526	10	+	55	----	----	----	----
524	10	+	55	----	----	----	----
522	10	-	-	----	----	----	----
522	1	-	-	----	----	----	----
522	9	-	-	----	----	----	----
522	2	-	-	----	----	----	----

barometric pressure: 1007.6 hPa barometric pressure: 1005.3 hPa

Table 4: Auto-ignition temperature (2nd main test)

2nd main test (2 K steps)
T (°C)	portions	+ / -	time lag (s)
524	10	+	46
522	10	+	50
520	10	-	-
520	1	-	-
520	9	-	-
520	2	-	-
520	8	-	-
520	3	-	-
520	7	-	-
520	4	-	-
520	6	-	-
520	5	-	-
barometric pressure: 1001.5 hPa

Table 5: Auto-ignition temperature (3rd main test)

T (°C)	portions	+ / -	time lag (s)
522	10	+	55
520	10	+	52
518	10	-	-
518	1	-	-
518	9	-	-
518	2	-	-
518	8	-	-
518	3	-	-
518	7	-	-
518	4	-	-
518	6	-	-
518	5	-	-
barometric pressure: 1003.3 hPa

Table 6: Auto-ignition temperature (summary)

Main test series	Auto-ignition temperature (°C)	Time lag (s)
1st main test (5 K)	532	31
1st main test (2 K)	524	55
2nd main test (2 K)	522	50
3rd main test (2 K)	520	52

The lowest self-ignition temperature of the test item was determined to be 520 °C in the main test. 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 515 °C.

Conclusions:

The self-ignition temperature of the test item was determined to be 515 °C.

Executive summary:

A study was conducted according to Commission Regulation (EC) No. 440/2008, method A.15 for liquids and gases in order to determine the self-ignition temperature of the test item in an oven. In a preliminary test the lowest temperature at which ignition of the test item was observed was used as starting point for the 1st main test (547 °C). In the first main test the ignition at this temperature was repeated and then temperature was decreased by 5 K steps and the test repeated. The time lag until ignition occured was noted. If no ignition occured the amount of test item was varied. The test was continued until the lowest self-ignition temperature of the test item was found. In a further main test the temperatures were decreased by 2 K steps in order to find the lowest self-ignition temperature of the test item. This test was repeated two times in order to verify the results of the first test. For each new test the lowest self-ignition temperature of the previous test was used as starting temperature. Finally, the lowest ignition-temperature of each test was noted (4 temperatures) and the lowest temperature of all was chosen as self-ignition temperature of the test item. Rounded down to the next lower number divisible by 5, the self-ignition temperature was determined to be 515 °C .

Description of key information

The self-ignition temperature of the test item was determined to be 515 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

515 °C

Additional information

A study was conducted according to Commission Regulation (EC) No. 440/2008, method A.15 for liquids and gases in order to determine the self-ignition temperature of the test item in an oven. In a preliminary test the lowest temperature at which ignition of the test item was observed was used as starting point for the 1st main test (547 °C). In the first main test the ignition at this temperature was repeated and then temperature was decreased by 5 K steps and the test repeated. The time lag until ignition occured was noted. If no ignition occured the amount of test item was varied. The test was continued until the lowest self-ignition temperature of the test item was found. In a further main test the temperatures were decreased by 2 K steps in order to find the lowest self-ignition temperature of the test item. This test was repeated two times in order to verify the results of the first test. For each new test the lowest self-ignition temperature of the previous test was used as starting temperature. Finally, the lowest ignition-temperature of each test was noted (4 temperatures) and the lowest temperature of all was chosen as self-ignition temperature of the test item. Rounded down to the next lower number divisible by 5, the self-ignition temperature was determined to be 515 °C (reference 4.12-1).