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Diss Factsheets

Administrative data

Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.6315 (Flammability)
Qualifier:
according to guideline
Guideline:
EU Method A.10 (Flammability (Solids))
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Tungsten disilicide
EC Number:
234-909-0
EC Name:
Tungsten disilicide
Cas Number:
12039-88-2
Molecular formula:
Si2W
IUPAC Name:
tungsten disilicide
Test material form:
solid: particulate/powder
Specific details on test material used for the study:
Batch number: 171130

Results and discussion

Flammable solids
Test procedure:
burning rate test: preliminary screening test
Remarks on result:
other: combustion along the powder train was observed only up to 12 cm within 4 minutes

Any other information on results incl. tables

The test item was filled into a mould of 250 mm length, with a triangular cross-section of 10 mm inner height and 20 mm width. On both the sides of the mould, in a longitudinal section two metal plates were mounted as lateral limitations that projected 2 mm beyond the upper edge of the triangular cross-section. The mould was dropped thrice from a height of 2 cm onto a solid surface. The mould was filled up with the test item again. The lateral limitations were then removed and the excess test item was scraped off. A non-combustible, non-porous and low heat-conducting base plate (ceramic tile) was placed on top of the mould and the apparatus was inverted and the mould was removed. A hot flame from the gas burner (diameter of the burner, 25 mm) was applied to one end of the powder train for a period of two minutes (maximum period). But it was observed that the test item powder train ignited after 2 seconds of application of the hot flame from the gas burner but the test item failed to burn the specified distance of 200 mm and just a linear, gentle (non-vigorous) combustion along the powder train was observed up to 12 cm within four minutes of total testing period after the withdrawal of flame (flame withdrawn after 2 minutes).

Also there was no smoldering observed up to a distance 200 mm within 4 minutes of total testing period after the withdrawal of flame.

Applicant's summary and conclusion

Interpretation of results:
not classified based on GHS criteria
Conclusions:
Tungsten disilicide is not flammable.
Executive summary:

In the 'Preliminary Screening Test', ignition of the test item powder train was observed after 2 seconds of application of the hot flame from the gas burner but the test item failed to burn the specified distance of 200 mm and a linear, gentle (non-vigorous) combustion along the powder train was observed only up to 12 cm within 4 minutes of total testing period after the withdrawal of flame (flame withdrawn after 2 minutes). Also there was no smoldering observed up to a distance 200 mm within four minutes of total testing period after the withdrawal of flame.

Although the test item powder-train readily ignited, it failed to burn the entire specified distance of 200 mm along the powder train and moreover, as there was no smouldering observed up to the specified distance of 200 mm along the powder train within 4 minutes of total testing period after the withdrawal of flame, tungsten disilicide is considered to be not flammable.

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