Cesium tungsten oxide

Oxidising properties

Administrative data

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

31 Jan - 07 Feb 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

adopted in 2008

GLP compliance:

yes (incl. QA statement)

Remarks:

Department of Health, London, UK

Test material

Test material information

Constituent 1

Test material form:

solid: nanoform, no surface treatment

Results and discussion

Test results (Oxidising solids)

Test results (Oxidising solids) 1

Sample tested:

other: 2:1 sample-to-cellulose ratio

Parameter:

preliminary test

Remarks on result:

vigorous reaction in the preliminary test

Test results (Oxidising solids) 2

Sample tested:

other: 1:9 - 9:1 sample-to-cellulose ratio

Parameter:

burning rate

Remarks on result:

not determinable

Remarks:

None of the test item/cellulose mixtures propagated combustion over the 200 mm

Any other information on results incl. tables

Preliminary Test

The mixture burnt with an orange flame which produced sparks.

Main Test

The results of the test are detailed in the following tables.

Table Reference Mixtures

% Barium nitrate	Observations	Burning time (s)	Burning rate (mm/s)
10	The mixture burnt with a pink/orange flame which emitted grey fumes.	236	0.847
20	The mixture burnt with a pink/orange flame which emitted grey fumes.	204	0.980
30	The mixture burnt with a pink/orange flame which produced orange sparks and emitted grey fumes.	227	0.881
40	The mixture burnt with a pink/orange flame which produced orange sparks and emitted grey fumes.	205	0.976
50	The mixture burnt with a pink/orange flame which produced orange sparks and emitted grey fumes.	201	0.995
60	The mixture burnt with an orange/yellow flame which produced orange sparks and emitted grey fumes.	163	1.227
70	The mixture burnt with an orange/yellow flame which produced orange sparks and emitted grey fumes.	195	1.026
80	The mixture burnt with an orange/yellow flame which produced orange sparks and emitted grey fumes, but self-extinguished after propagating combustion over 85 mm in 242 seconds.	-	-
90	The mixture failed to ignite.	-	-

 Maximum burning rate = 1.227 mm/s.

Table Test Item: Cellulose Mixtures

% Test item	Observations	Burning time(s)	Burning rate (mm/s)
10	The mixture burnt with a blue flame which emitted grey fumes but self-extinguished after propagating combustion over 100 mm in 298 seconds	-	-
20	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-
30	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-
40	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-
50	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-
60	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-
70	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-
80	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-
90	The mixture burnt with a blue flame emitting grey smoke but self-extinguished without propagating combustion.	-	-

Testing was stopped as none of the test item/cellulose mixtures propagated combustion over the 200 mm.

Conclusion

The test item has been determined not to have oxidizing properties as the test item/cellulose mixtures failed to propagate combustion over the full 200 mm of the test.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The test item has been determined not to have oxidizing properties as the test item/cellulose mixtures failed to propagate combustion over the full 200 mm of the test.

Executive summary:

The EU A.17 methid was used to determine the oxidising properties of the test item. 

 

Sample and reference burning rates are determined as detailed below:

Reference mixtures were prepared by mixing barium nitrate and cellulose in various ratios (10 to 90% by weight).

Sample mixtures were also prepared by mixing test item and cellulose in various ratios (10 to 90% by weight).

A mould was loosely filled with a slight excess of each mixture. The mould was dropped from a height onto a solid surface. Any excess mixture was scraped off and the lateral limitations of the mould removed. The remaining mixture was smoothed using a roller. A non-porous, non-combustible board was placed on top of the mould which was then inverted and carefully removed forming a pile. One end of the pile was ignited using an air-rich Bunsen burner flame. The time taken for the reaction zone to travel over a distance of 200 mm after propagating an initial distance of 30 mm and details of the mode of reaction were recorded.

 

The test item has been determined not to have oxidizing properties as the test item/cellulose mixtures failed to propagate combustion over the full 200 mm of the test.