Naphthenic acids, copper 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:

2019-01-15 to 2019-01-31

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

deviations from the guidelines were stated in the field `Principle of method if other than guideline´

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2008

Deviations:

yes

Remarks:

Please refer to the field `Principle of method if other than guideline´

Qualifier:

according to guideline

Guideline:

DIN EN 14522, Method P (Determination of the auto ignition temperature of gases and vapours)

Version / remarks:

2005

Deviations:

yes

Remarks:

Please refer to the field `Principle of method if other than guideline´

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2003

Deviations:

yes

Remarks:

Please refer to the field `Principle of method if other than guideline´

Principles of method if other than guideline:

The substance copper naphthenate is legally classified (Index No. 029-003-00-5) as flammable liquid Cat. 3 (with a flash point ≥ 23 °C and ≤ 60 °C). Hence, testing on auto-flammability is required according to Regulation (EC) no 1907/2006 Annex VII.
Based on the appearance of the test item copper naphthenate (i.e., green, liquid, viscous, paste) there were modifications to the existing guidelines necessary that do not effect the result of the study.

Deviations from the guidelines were:
- Sampling should be performed according to DIN 51750-1 but was performed by heating up the test item to approx. 80 °C in a water bath to allow the removal of a homogeneous sample
- Viscous liquids should be given drop by drop into the ignition vessel with the syringe. Based on the highly viscous pasty test item, metal spatulas of different sizes were used for sampling and input into the ignition flask.
- Substance quantity: 5 drops required. However, due to the nature of the test item, substance amounts of 0.25 till 0.45 g, 0.10 till 0.20 g and 0.01 till 0.10 g were used.
- Repetitions of the main experiment were not performed, since one main test was considered sufficient to evaluate the auto-flammable properties of the test substance and to reduce the workload for the hard-to-handle test substance to an acceptable minimum.

GLP compliance:

yes (incl. QA statement)

Remarks:

2017-02-28

Auto-ignition temperature:

355 °C

Atm. press.:

>= 984.6 - <= 984.8 hPa

Preliminary Test

An approximate value of the ignition temperature of the test item was first determined by a preliminary test. An ignition is denoted as “+” and no ignition is denoted as “-“. Approximately 0.25 g to 0.45 g test item was put into the Erlenmeyer flask at each temperature.

Results of the preliminary test

Temperature [°C]	Ignition [+/-]
205	-
253	-
301	-
358	-
407	+
398	+
389	-
Atmospheric pressure: 1007.9 hPa

In the preliminary test, the lowest temperature at which an ignition occurred was 398 °C.

Main Test

An ignition is denoted as “+” and no ignition is denoted as “-“. Approximately 0.01 g to 0.45 g test item was put into the Erlenmeyer flask at each temperature. At temperatures around the auto-ignition temperature 3 different amounts of test item were given into the Erlenmeyer flask (i.e., 0.25-0.45 g, 0.10-0.20 g and 0.01-0.10 g).

Result of the main test

Temperature [°C]	Ignition [+/-]	Temperature [°C]	Ignition [+/-]
413^1)	+	384^1)	+
410^1)	+	381^1)	+
407^1)	+	379^1)	+
405^1)	+	377^1)	+
403^1)	+	373^1)	-
400^1)	+	373^1)	-
398^1)	+	373^1)	-
397^1)	+	373^1)	-
394^1)	+	373^2)	+
391^1)	+	371^2)	+
390^1)	+	369^2)	+
387^1)	+	367^2)	-
Atmospheric pressure: 993.6 – 995.9 hPa		Atmospheric pressure: 980.1 – 993.6 hPa

Temperature [°C]	Ignition [+/-]	Temperature [°C]	Ignition [+/-]
367^2)	+	358^3)	+
364^2)	-	355^3)	-
364^2)	+	354^3)	-
362^2)	-	354^3)	-
361^2)	+	354^3)	-
358^2)	-	354^2)	-
358^2)	-	354^2)	-
357^2)	-	355^2)	-
358^1)	-	354^1)	-
357^1)	-	354^1)	-
358^1)	-	355^1)	-
358^3)	-
Atmospheric pressure: 980.2 – 985.3 hPa		Atmospheric pressure: 984.6 – 984.8 hPa

¹⁾ Amount of test item 0.25 – 0.45 g

²⁾ Amount of test item 0.10 – 0.20 g

³⁾ Amount of test item 0.01 – 0.10 g

 

Test result

Lowest value of the first series of experiments: 361 °C

Lowest value of the main test: 358 °C

Different amounts of test item (i.e., 0.01 g till 0.45 g) at different temperatures below 358 °C (i.e., 354 °C and 355 °C) were tested.

No auto-ignition of the test item was observed.

Based on results of the main test series, the lowest auto-ignition temperature was 358 °C. One main test was carried out with different amounts of test item.This was considered sufficient to evaluate the auto-flammable properties of the test substance and to reduce the workload for the hard-to-handle test substance to an acceptable minimum.

According to Regulation EC No. 440/2008 and DIN 51794: The auto-ignition temperature rounded down to the nearest multiple of 5 °C was determined to be 355 °C.

In accordance with DIN EN 13463-1, the test item has to be assigned to temperature class T2.

Temperature classes

Temperature class	Maximum surface temperature / minimum auto ignition temperature [°C]
T1	450
T2	300
T3	200
T4	135
T5	100
T6	85

Conclusions:

The auto-ignition temperature of the test item Copper Naphthenate was determined to be 355 °C (determined at 984.6 – 984.8 hPa) according to the Regulation EC No. 440/2008 Method A.15. Auto-Ignition Temperature (Liquids and Gases) and DIN 51794 (2003).
It is noted here that according to ECHA guidance – Guidance on information requirements and chemical safety assessment; chapter R.7A: Endpoint specific guidance, October 2015 – the auto-ignition temperature for liquids is not used directly for classification and labeling according to Regulation (EC) 1272/2008. However, it can be used in the chemical safety assessment in considering risks associated with processing the substance.
Therefore, in accordance with DIN EN 13463-1, the test item has to be assigned to temperature class T2.

Description of key information

The auto-ignition temperature of the test item Copper Naphthenate was determined to be 355 °C (determined at 984.6 – 984.8 hPa)

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

355 °C

Additional information

The auto-ignition temperature of the test item Copper Naphthenate was determined to be 355 °C (determined at 984.6 – 984.8 hPa) according to the Regulation EC No. 440/2008 Method A.15. Auto-Ignition Temperature (Liquids and Gases) and DIN 51794 (2003).

It is noted here that according to ECHA guidance – Guidance on information requirements and chemical safety assessment; chapter R.7A: Endpoint specific guidance, October 2015 – the auto-ignition temperature for liquids is not used directly for classification and labeling according to Regulation (EC) 1272/2008. However, it can be used in the chemical safety assessment in considering risks associated with processing the substance.

Therefore, in accordance with DIN EN 13463-1, the test item has to be assigned to temperature class T2.