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Reference
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23rd March 2015 - 27th March 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Deviations:
no
GLP compliance:
yes
Contact with:
powdered cellulose
Key result
Sample tested:
other: Reference: 2:1 Cellulose
Parameter:
burning time of reaction over a distance of 200 mm
Result:
ca. 32 s
Key result
Sample tested:
other: Test sample: 2:1 Cellulose
Parameter:
burning time of reaction over a distance of 200 mm
Result:
ca. 47 s

Preliminary Screening Test:

 Composition of 2:1 Ratio  Mass of material (g)  Type of reaction  Burning time (sec)  Comments on burning behaviour
 Reference sample  4  Vigorous  32  Sample completely Cellulose 2 finished burning at 48 s
 Cellulose  2  Vigorous  32   Sample completely Cellulose 2 finished burning at 48 s
 Test sample  4  Moderate  47  Sample completely Cellulose 2 finished burning at 156 s
Cellulose   2  Moderate  47  Sample completely Cellulose 2 finished burning at 156 s

Full Train Test – For Reference Material with Cellulose:

 Concentration (%)  50  60  70  80  90  Max Burning mixture (%)  Maximum Burning rate (mm/s)
 Mass of Reference (g) 6   9  14  16  N/A  60  1.7
 Mass of Cellulose (g) 6   6  6  4  N/A  60  1.7
 Burning time (s) 153  118  205  345  N/A  60  1.7
 Burning rate <mm/s) 1.3  1.7  1.0  0.6  -  60  1.7

Train Test - For Thio-Acid Propionate:

 Concentration (%)  10  20  30  40  50  60  70  80  90
 Mass of Sample (g) 1   2  3  4  5  6  7  8  9
 Mass of cellulose (g) 9   8  7  6  5  4  3  2  1
 Burning time over 200mm (sec)  185  177  171  151  139  140  136  114  113
 Burning rate (mm/s) 1.1   1.1  1.2  1.3  1.4  1.4  1.5  1.8  1.8

Note 1: If any of these mixtures exceeds or equals the burning rate of the reference standard, the sample is considered an oxidiser and the test is complete. Otherwise repeat the test five times with each of the three concentrations that show the fastest burning rate.

Note : Maximum burning rate for Thio-Acid Propionate : 1.8 mm.s-1

Interpretation of results:
GHS criteria not met
Remarks:
The sample of Thio-Acid Propionate should be classed as "Not an oxidising solid"
Conclusions:
The sample of Thio-Acid Propionate should be classed as ‘Not an oxidising solid’.
Executive summary:

It was noted that the rate of burning propagation increased as the sample became more concentrated, this suggested that the sample may be flammable and thus may give rise to a false positive for oxidising properties.

The preliminary test was re-run using an inert substance (diatomaceous earth) in place of cellulose in accordance with the test standard. It was found that the burning rate was slightly faster when using an inert material, and therefore confirmed that the initial preliminary result and subsequent train test results are a false positive.

This was supported also by additional information supplied by the client. Previous Flammability of Solids testing conducted by the client on Thio-Acid Propionate provided burning times of between 57 to 79 seconds over a 100 mm distance (burning rate = 1.3 - 1.8 mm.s-1 ).

Therefore the sample of Thio-Acid Propionate should be classed as ‘Not an oxidising solid’.

Description of key information

It was noted that the rate of burning propagation increased as the sample became more concentrated, this suggested that the sample may be flammable and thus may give rise to a false positive for oxidising properties.

The preliminary test was re-run using an inert substance (diatomaceous earth) in place of cellulose in accordance with the test standard. It was found that the burning rate was slightly faster when using an inert material, and therefore confirmed that the initial preliminary result and subsequent train test results are a false positive.

This was supported also by additional information supplied by the client. Previous Flammability of Solids testing conducted by the client on Thio-Acid Propionate provided burning times of between 57 to 79 seconds over a 100 mm distance (burning rate = 1.3 - 1.8 mm.s-1 ).

Therefore the sample of Thio-Acid Propionate should be classed as ‘Not an oxidising solid’.

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Justification for classification or non-classification