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Oxidising properties

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Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
March-April, 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted and documented study, under internal management system, certificate of analysis included in the report.
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Version / remarks:
EC 440/2008
Deviations:
yes
Remarks:
Oxidizer (PTSC)-cellulose mixtures containing 20 to 80% of oxidizer were prepared in 20% increments instead of 10% increments. This deviation is considered to have no impact on quality and integrity of the study.
GLP compliance:
no
Remarks:
internal management system
Contact with:
powdered cellulose
Sample tested:
reference mixture (not specified)
Remarks:
migrated information
Parameter:
maximum burning rate
Result:
3.3 other: cm/min
Remarks on result:
other: 60% w/w Ba(NO3)2
Sample tested:
test mixture (not specified)
Remarks:
migrated information
Parameter:
maximum burning rate
Result:
4.7 other: cm/min

The table below and yhe graph attached show a summary of the test results.

 

oxidizer

[% w/w]

burning time

[sec]

burning rate

[cm/min]

Ba(NO3)2

PTSC

in cellulose

in kiezelguhr

in cellulose

in kiezelguhr

60

 

366

 

3.3

 

 

20

253

no burning

4.7

0

 

40

262

no burning

4.6

0

 

60

527

no burning

2.3

0

 

80

goes out after

46 seconds

 

0

 

As can be seen, higher burning rates were measured for substance mixtures (PTSC/cellulose) as compared to the reference mixture (Ba(NO3)2/cellulose). The substance therefore might be considered as oxidizing. Because there was no burning throughout the sample from top to bottom, and no ‘reactive’ burning was observed and no sparks were seen (as withBa(NO3)2) the result could be a false positive. To exclude this possibility the test was repeated using an inert substance (kiezelguhr) in place of the cellulose. No burning was observed for 3 mixtures with varying concentrations. According to Guidance on information requirements and chemical safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008 [2], this result means that the substance has oxidizing properties.

Interpretation of results:
other: oxidising
Remarks:
Migrated information
Conclusions:
Para-Toluene Sulfo Chloride is considered as an oxidizing substance.
Endpoint:
oxidising properties
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28/10/2013-31/10/2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study according to international guideline, no deviations from guideline reported.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
other: UN Test O.1: Oxidising Solids
Principles of method if other than guideline:
Not relevant
GLP compliance:
no
Contact with:
powdered cellulose
Sample tested:
other: not specified (migrated information) burning time of reference substance
Parameter:
other: burning time of reference substance
Result:
103 s
Remarks on result:
other: 3:7 KBrO3/cellulose; average of 5 runs
Sample tested:
other: not specified (migrated information) burning time of test substance
Parameter:
other: burning time of test substance
Result:
200.4 s
Remarks on result:
other: 1:1 test material/cellulose; average of 5 runs
Sample tested:
other: not specified (migrated information) burning time of test substance
Parameter:
other: burning time of test substance
Result:
258.8 s
Remarks on result:
other: 4:1 test material/cellulose; average of 5 runs
Sample tested:
other: not specified (migrated information) burning time of reference substance
Parameter:
other: burning time of reference substance
Result:
103 s
Remarks on result:
other: 3:7 KBrO3/cellulose; average of 5 runs
Sample tested:
other: not specified (migrated information) burning time of test substance
Parameter:
other: burning time of test substance
Result:
200.4 s
Remarks on result:
other: 1:1 test material/cellulose; average of 5 runs
Sample tested:
other: not specified (migrated information) burning time of test substance
Parameter:
other: burning time of test substance
Result:
258.8 s
Remarks on result:
other: 4:1 test material/cellulose; average of 5 runs

Table 1 : Reference Sample Results

 Mix Ratio (w/w)  Burning Times (s)              Mean (s)
 3:7 (PB:9g/ C:21g)  107  102  96  109  101  103.0

PB = Potassium Bromate

C = Cellulose

Table 2 : Test Sample Results

 Mix Ratio (w/w)  Burning Times (s)              Mean (s)
 1:1 (TM:15g/ C:15g)  189  208  204  190  211  200.4
 4:1 (TM:24g/ C:6g)  249  261  264  252  268  258.8

TM = Test Material (PTSC_Para-Toluene Sulfo Chloride)

C = Cellulose

Comments: Sample burned with an orange flame and medium quantities of grey smoke.

Interpretation of results:
other: no oxidising properties
Remarks:
Migrated information
Conclusions:
p-Toluenesulfochloride is not an Oxidising Solid.
Executive summary:

The oxidizing properties of p-Toluenesulfochloride were investigated according to UN test O.1. Based on the burning times of the substance compared to the burning time of the reference substance it was concluded that p-Toluenesulfochloride is not an oxidizing solid.

Description of key information

Para-Toluene Sulfo Chloride is not considered an oxidising substance.

Key value for chemical safety assessment

Oxidising properties:
no

Additional information

For the endpoint oxidising properties, two tests with reliability 1 are available: a test conducted following guideline A.17 for oxidising solids which found the substance to be oxidising and a test conducted following guideline UN O.1 which found the substance to be not oxidising. According to the Guidance on Information Requirements and Chemical Safety Assessment, Chapter R.7a, test O.1 gives more detailed information on the oxidising behaviour of the substance, as more reference mixtures are used, and data obtained in a A.17 test cannot be interpreted according to the classification criteria of CLP.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Date of last update to CSR: April 24, 2013

Justification for classification or non-classification

Under the DSD (67/548/EEC), A.17 is the recommended test for classification, which results in the substance being classified as oxidiser and assigned a risk phrase R8.

Under CLP (1272/2008/EC), however, UN test O.1 is advised to be used for classification. According to the Guidance on Information Requirements and Chemical Safety Assessment, Chapter R.7a, test O.1 gives more detailed information on the oxidising behaviour of the substance, as more reference mixtures are used. Test data obtained in a A.17 test cannot be interpreted according to the classification criteria of CLP. Therefore, based on the results of the UN O.1 test, the substance is not considered an oxidising substance.