Benzenesulfonic acid, 4-C10-13-sec-alkyl derivs., ammonium salts

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:

03 August 2017 - 09 April 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met.

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

Regulation (EC) 440/2008 of 30 May 2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)

Version / remarks:

2003

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Key result

Auto-ignition temperature:

455 °C

Atm. press.:

>= 1 004 - <= 1 004.2 hPa

Remarks on result:

other: In accordance with Regulation EC No. 440/2008 and DIN 51794: The auto-ignition temperature rounded down to the nearest multiple of 5 °C was determined as 455 °C.

Remarks:

The recorded the lowest auto-ignition temperature recorded during the main test was 459 °C.

Preliminary Test:

An approximate value of the ignition temperature of the test item was first determined by a preliminary test. Table 1 gives the result of the preliminary test. An ignition is denoted as “+” and no ignition is denoted as “-“. 5 drops were put into the Erlenmeyer flask at each temperature.

 

Table 1:         Results of the preliminary test

	Preliminary test
Temperature / °C	202	251	302	351	400	451	501	491	482	472
Ignition / +/-	-	-	-	-	-	-	+	+	+	+
	Atmospheric pressure: 1004 hPa

In the preliminary test, the lowest temperature at which an ignition occurred was 472 °C.

Main Test:

The lowest temperatures at which an ignition occurred in the main test, independent of the number of drops used, are given Table 2.

Table 2:       Lowest temperatures at which an ignition occurred

Main test series	Lowest temperatures of an ignition	Highest temperatures without an ignition	Atmospheric Pressure
1	459 °C	455 °C	1004.0 – 1004.2 hPa
2	466 °C	463 °C	1004.0 – 1004.1 hPa
3	463 °C	460 °C	1004.1 hPa

Based on results of the main test series, the lowest auto-ignition temperature was 459 °C.

Regulation EC No. 440/2008 and DIN 51794: The auto-ignition temperature rounded down to the nearest multiple of 5 °C was determined as 455 °C.

Conclusions:

The test item has been determined to have an auto-ignition temperature of 455 °C at 1004 hPa.

Executive summary:

EU Method A.15. – The auto-ignition temperature of the test item was determined using a procedure designed to be compatible with Method A.15., Auto-Ignition Temperature (Liquids and Gases), of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Following a preliminary test to establish an indicative auto-ignition temperature, aliquots of test item (1 – 10 drops) were added to the apparatus at the lowest auto-ignition temperature found in the preliminary test.  The temperature was decreased in intervals of 3 – 5 K.  This process was repeated until no ignition was observed.  At this temperature, the number of drops of test item added to the apparatus was varied.  Further tests were carried out where temperature and number of drops were varied to establish a temperature at which ignition was observed independent of the number of drops added.  Two further test series were then carried out in this temperature range to confirm the lowest temperature at which ignition was observed.  Once established, the auto-ignition temperature is regarded as the lowest temperature rounded down to the nearest multiple of 5 °C at which an ignition is observed in any of the main tests.

The auto-ignition temperature of the test item was determined to be 455 °C.

Description of key information

Auto-ignition temperature: 455 °C (732.15 K) at 1004 hPa; EU Method A.15.; S Seitz (2017)

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

455 °C

Additional information

EU Method A.15. – The auto-ignition temperature of the test item was determined using a procedure designed to be compatible with Method A.15., Auto-Ignition Temperature (Liquids and Gases), of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Following a preliminary test to establish an indicative auto-ignition temperature, aliquots of test item (1 – 10 drops) were added to the apparatus at the lowest auto-ignition temperature found in the preliminary test.  The temperature was decreased in intervals of 3 – 5 K.  This process was repeated until no ignition was observed.  At this temperature, the number of drops of test item added to the apparatus was varied.  Further tests were carried out where temperature and number of drops were varied to establish a temperature at which ignition was observed independent of the number of drops added.  Two further test series were then carried out in this temperature range to confirm the lowest temperature at which ignition was observed.  Once established, the auto-ignition temperature is regarded as the lowest temperature rounded down to the nearest multiple of 5 °C at which an ignition is observed in any of the main tests.

The auto-ignition temperature of the test item was determined to be 455 °C.