Molybdenum zinc tetraoxide

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Deviations:

no

GLP compliance:

no

Contact with:

powdered cellulose

Key result

Sample tested:

other: 10/90% test substance / cellulose

Parameter:

burning rate

Result:

2.15 mm/s

Key result

Sample tested:

other: 20/80% test substance / cellulose

Parameter:

burning rate

Result:

2.06 mm/s

Key result

Sample tested:

other: 30/70% test substance / cellulose

Parameter:

burning rate

Result:

1.98 mm/s

Burning rate of Test substance mixture

% Test Substance	Burning Time (s)	Burning Rate (mm/s)
10	95.38	2.10
20	96.34	2.08
30	98.94	2.02
40	112.44	1.78

The mixtures 50/50, 60/40, 70/30, 80/20 and 90/10 carbonized only at the same place.

As the burning rate was lower than the highest burning rate of the reference item mixtures, the determination of burning rate was repeated five times for each of the three mixtures test item/cellulose (10%; 20%; 30%) with the highest burning rates:

Determination of burning rate mixture 10/90% test substance/cellulose:

Measurement	Burning Time (s)	Burning Rate (mm/s)
1	95.84	2.09
2	92.78	2.16
3	89.47	2.24
4	93.89	2.13
5	90.47	2.21
6(from first performance)	95.38	2.10
Mean		2.15
Standard Deviation in mm/s		0.06
Standard Deviation in %		2.80%

Determination of burning rate mixture 20/80% test substance/cellulose:

Measurement	Burning Time (s)	Burning Rate (mm/s)
1	98.75	2.03
2	97.28	2.06
3	96.78	2.07
4	93.49	2.14
5	100.19	2.00
6(from first performance)	96.34	2.08
Mean		2.06
Standard Deviation in mm/s		0.05
Standard Deviation in %		2.37%

Determination of burning rate mixture 30/70% test substance/cellulose:

Measurement	Burning Time (s)	Burning Rate (mm/s)
1	103.4	1.93
2	102.91	1.94
3	99.77	2.00
4	101.38	1.97
5	100.67	1.99
6(from first performance)	98.94	2.02
Mean		1.98
Standard Deviation in mm/s		0.03
Standard Deviation in %		1.72%

Burning rate mixture of reference substance:

% Ba(NO3)2	Burning Time (s)	Burning Rate (mm/s)
50	72.22	2.77
60	62.34	3.21
70	69.84	2.86

The highest burning rate of the three mixtures test substance/cellulose with the highest burning rate was determined to be 2.15 ± 0.06 mm/s. The maximum burning rate of the reference substance was determined to be 3.21 mm/s. Therefore, the test substance is considered to have no oxidising properties.

None of the deviations surpasses 10%. Therefore, the study is considered as valid.

Interpretation of results:

GHS criteria not met

Conclusions:

The test substance was determined to have no oxidising properties.

Executive summary:

The determination of the oxidising properties of the substance has been evaluated according to the EU Method A.17. The substance was dried in an exsiccator and sieved through a 125 µm sieve. Based on preliminar test, different mixutres of test item and cellulose and the reference substance and cellulose were prepared. The pile was ignited at one end with the flame of the Bunsen burner. When the flame had propagated over a distance of 30 mm, reaction time along the next 200 mm was measured using a stop watch. All reference substance mixtures showed clear signs of oxidising properties (cracks, spar-kling) and burned with a green-orange flame. All test substances mixtures showed no signs of oxidising properties. The mixtures 10/90, 20/80, 30/70 and 40/60 carbonized and smoke was observed. The mixtures 50/50, 60/40, 70/30, 80/20 and 90/10 carbonized only at the same place. No sparkling and cracks were observed. As the burning rate was lower than the highest burning rate of the reference item mixtures, the determination of burning rate was repeated five times for each of the three mixtures test item/cellulose (10%; 20%; 30%) with the highest burning rates. The highest burning rate of the three mixtures test substance/cellulose with the highest burning rate was determined to be 2.15 ± 0.06 mm/s. The maximum burning rate of the reference substance was determined to be 3.21 mm/s. Therefore, the test substance is considered to have no oxidising properties.

Description of key information

Key study: EU Method A.17. The test substance is considered to have no oxidising properties.

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Justification for classification or non-classification

Based on available information, the substance is not classified for oxidising properties according to the CLP Regulation (EC) no. 1272/2008.