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Reference
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
30 June - 27 September, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Version / remarks:
31 May 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Specific details on test material used for the study:
Expiry date 28 July 2020
Contact with:
other: Oxidiser cellulose-mixtures containing 10 to 90 % weight of oxidiser in 10 % increments were prepared. Based on sponsor’s suspicion that the result is a false positive the test was repeated using kieselguhr in place of cellulose.
Key result
Sample tested:
other: Oxidiser cellulose-mixtures containing 10 to 90 % weight of oxidiser in 10 % increments were prepared.
Remarks:
burning time: 326sec
Parameter:
burning time of reaction over a distance of 200 mm
Result:
0.613 mm/s
Remarks on result:
other: The test was repeated with kieselguhr in place of cellulose. These mixtures could not be ignited.

Reference measurement

Ratio

Ba(NO3)2: Cellulose

Weight

Ba(NO3)2(g)

Weight

Cellulose (g)

Burning time (sec)

Burning rate (mm/sec)

10 : 90 %

2.00

18.01

469

0.426

20 : 80 %

4.02

16.01

406

0.493

30 : 70 %

6.04

14.02

395

0.506

40 : 60 %

12.00

18.01

439

0.456

50 : 50 %

15.02

15.00

503

0.398

60 : 40 %

18.01

12.01

563

0.355

70 : 30 %

21.01

9.00

638

0.313

80 : 20 %

40.00

10.02

-

-

90 : 10 %

45.00

5.03

-

-

 

  Main Test

Ratio

Test item : Cellulose

Weight

Test item (g)

Weight

Cellulose (g)

Burning time

(sec)

Burning rate (mm/sec)

Type of burning

10 : 90 %

2.02

18.01

326

0.613

ignited, burnt with flame

20 : 80 %

4.01

16.02

-

-

ignited, did not propagate over 200 mm

 

 Trials with test item –kieselguhrmixtures

Ratio

Test item : Kieselguhr

Weight

Test item (g)

Weight

Kieselguhr(g)

Burning time

(sec)

Burning rate (mm/sec)

Type of burning

10 : 90 %

2.02

18.04

-

-

no ignition

20 : 80 %

4.01

16.01

-

-

no ignition

30 : 70 %

6.02

14.00

-

-

no ignition

40 : 60 %

12.02

18.02

-

-

no ignition

50 : 50 %

15.01

15.01

-

-

no ignition

60 : 40 %

18.00

12.00

-

-

no ignition

70 : 30 %

14.00

6.00

-

-

no ignition

80 : 20 %

16.04

4.01

-

-

no ignition

90 : 10 %

18.01

2.01

-

-

no ignition

 

Interpretation of results:
GHS criteria not met
Conclusions:
The cone-shaped pile formed during the Preliminary Test was ignited, but the flame went out. The reaction was not vigorous; therefore the Main Test was performed. The highest value of burning rate of a given mixture is relevant for evaluation.
In the course of the Main Test burning rate of the mixture containing 10% test item was higher than the highest burning rate of the reference mixture. The substance should be considered as oxidizing under these testing conditions. Based on the manufacturing process and chemical structure of the substance, this result was however deemed as a false positive.

As stated in method A.17 of EC Regulation 40/2008, section 1.6.2.2 the test was repeated with kieselguhr in place of cellulose. These mixtures could not be ignited. Then it is concluded that the test item Blue Sema is not considered as an oxidizing substance
Executive summary:

The purpose of this study was to investigate the oxidising properties of the test item.

No further testing is required when the preliminary test clearly indicates that the substance has oxidising properties. When this is not the case, the substance is subjected to the full test.

In the main test, the substance to be tested and a defined combustible substance are mixed in various ratios. Each mixture is then formed into a pile and the pile ignited at one end. The maximum burning rate determined is compared with the maximum burning rate of the reference mixture.

Burning rate of the test mixture containing 10% Blue Sema was found to be higher than the maximum burning rate of the reference mixture.

As the result was suspected of being a false positive, the test was repeated using kieselguhr in place of cellulose. These mixtures could not be ignited.

 

Description of key information

The purpose of this study was to investigate the oxidizing properties of the test item. In the course of the Main Test burning rate of the mixture containing 10% test item was higher than the highest burning rate of the reference mixture. This result was however deemed as a false positive.

As stated in method A.17 of EC Regulation 40/2008, section 1.6.2.2 the test was repeated with kieselguhr in place of cellulose. These mixtures could not be ignited. Then it is concluded that the test item Blue Sema  is not considered as an oxidizing substance

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Justification for classification or non-classification

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