Naphthalenesulfonic acid, di-C9-rich C8-10-branched alkyl derivs., calcium salts

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:

Start Start : 19 March 2012 Completion : 20 July 2012

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP study without deficiencies. Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) is a close structural analog and the data are acceptable as read-across.

Qualifier:

according to guideline

Guideline:

other: United Nations (UN), UN no. ST/SG/AC.10/11/Rev.5: Recommendations on the Transport of Dangerous Goods, Part III: Classification Procedures, Test Methods and Criteria - Test N.4: “Test Method for Self-heating Substances”, 2009.

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Key result

Relative self-ignition temperature:

> 140 °C

Remarks on result:

no self ignition observed under the test conditions

No exothermic effect of the test substance was observed. It demonstrated that the test substance is “not a self-heating substance”. According to the guideline, no further testing was required. After the experiment, the test substance had turned into a brown coagulated residue. It indicated that the test substance had been molten, decomposed and/or reacted during the experiment.

Conclusions:

The self-heating temperature of Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) was determined by Test 1 of the Modified Bowes-Cameron Cage test.
Based on the results obtained, the test substance is considered “not a self-heating substance”.

Executive summary:

The self-heating temperature for Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) was determined following the guideline published by the United Nations ( United Nations (UN), UN no. ST/SG/AC.10/11/Rev.5: Recommendations on the Transport of Dangerous Goods, Part III: Classification Procedures, Test Methods and Criteria Relating to Class 2, Class 3, Class 4, Division 5.1, Class 8 and Class 9, Test N.4: “Test Method for Self-heating Substances”, 2009).

Performance of the test

The ability of the test substance to undergo oxidative self-heating was determined by Test 1 of the Modified Bowes-Cameron Cage test. The test substance was exposed to air at temperatures of 140°C using a temperature controlled laboratory oven, cubic stainless steel wire sample containers of 100 mm wide, NiCr/Ni thermocouples and a temperature recording device. A sample container with dimensions of 10×10×10 cm and a mesh size of 0.053 mm was filled with the test substance. The container was housed in a stainless steel container cover of 11×11×11 cm with a mesh size of 0.60 mm. One thermocouple was placed at the centre of the sample container. To avoid the effect of air circulation the sample container was installed in a stainless steel cage of 15×15×25 cm with a mesh size of 0.60 mm. The sample container was placed in the centre of the oven. The other thermocouple was placed between the sample container and the wall of the oven. The oven temperature was raised to 140°C ± 2°C and kept for 24 hours. The temperature of the sample and the oven were recorded with time intervals of 5 minutes. After the experiment, the sample was cooled and the consistency of the test substance was determined.

A positive result is obtained if spontaneous ignition of the test substance occurs or if the temperature of the test substance exceeds the oven temperature by 60°C during the 24 hour testing time. Otherwise, the result is considered negative.

Results

No exothermic effect of the test substance was observed. It demonstrated that the test substance is “not a self-heating substance”. According to the guideline, no further testing was required. After the experiment, the test substance had turned into a brown coagulated residue. It indicated that the test substance had been molten, decomposed and/or reacted during the experiment.

Conclusion

The self-heating temperature of Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) was determined by Test 1 of the Modified Bowes-Cameron Cage test. Based on the results obtained, the test substance is considered “not a self-heating substance”.

Description of key information

The self-heating temperature of Calcium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) was determined by read-across from testing of the close analog Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate). Testing of the barium compound was by Test 1 of the Modified Bowes-Cameron Cage method. Based on the results obtained, the test substance is considered “not a self-heating substance”.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

140 °C