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Physical & Chemical properties

Flammability

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Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-07-02 to 2010-08-12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study, conducted according to Part III, sub-section 33.2.1, of the UN-MTC method.
Qualifier:
according to
Guideline:
other: Part III, sub-section 33.2.1, of the UN-MTC
Qualifier:
equivalent or similar to
Guideline:
EU Method A.10 (Flammability (Solids))
GLP compliance:
yes
Test procedure:
burning time (test type not further specified)
Remarks:
or specified in description of method (migrated information)
Burning time:
> 1 200 s
Remarks on result:
other: Since the tungsten carbide powder samples did not burn or smolder during the preliminary testing period (e.g. 5 minutes ignition plus 20 additional minutes), no further testing of flammability was required.
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.

Approximately 95 to 150 mm length of each tungsten carbide powder sample tested that was near or in direct contact with the flame turned a light yellow color. Since the tungsten carbide powder samples did not burn or smolder during the preliminary testing period (e.g. 5 minutes ignition plus 20 additional minutes), no further testing of flammability was required.

Interpretation of results:
non flammable
Remarks:
Migrated information
Conclusions:
None of the three test substance samples (sizes 0.53, 0.60, and 0.84 um (FSSS) burned with a flame or smoldered in the preliminary test. Therefore, no further testing was needed, and the tungsten carbide samples were not considered to be flammable.
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Reliability assigned by secondary source. Only secondary source reviewed.
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
EU Method A.10 (Flammability (Solids))
Version / remarks:
Directive 92/69/EEC, A.10
GLP compliance:
not specified
Test procedure:
burning time (test type not further specified)
Remarks:
or specified in description of method (migrated information)
Burning time:
> 600 s
Remarks on result:
other: determined to be non-flammable
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.
With the method A.10 the substance is determined to be non-inflammable.
Conclusions:
The substance is not inflammable.
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2004-04-09 to 2004-04-13
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Conducted with methodology equivalent to EU methods A.10. Limited description of methodology was given.
Qualifier:
equivalent or similar to
Guideline:
EU Method A.10 (Flammability (Solids))
GLP compliance:
not specified
Test procedure:
burning time (test type not further specified)
Remarks:
or specified in description of method (migrated information)
Burning time:
1 110 s

The average burning rate was 8.2 minutes over the 100mm length and 18.5 over the entire 250 mm length of sample.

Conclusions:
The average burning rate was 18.5 minutes over the entire 250 mm length of sample (particle size 0.7 um max). Therefore, the test substance is considered to be non-flammable in this test.
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2003-10-31 to 2003-11-06
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Conducted with methodology equivalent to EU methods A.10 and A.13. Limited description of methodolgy was given.
Qualifier:
equivalent or similar to
Guideline:
EU Method A.10 (Flammability (Solids))
Qualifier:
equivalent or similar to
Guideline:
EU Method A.13 (Pyrophoric Properties of Solids and Liquids)
GLP compliance:
not specified
Test procedure:
burning time (test type not further specified)
Remarks:
or specified in description of method (migrated information)
Burning time:
966 s
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.

The burning rate for the sample with nominal particle size of 0.7 -1.0 um over the 250 mm sample was 30 minutes (>20 minutes) in the preliminary screening test. Therefore, no further tests were conducted for this sample.

The burning rate for the sample with nominal particle size of 0.7 um max over the 250 mm sample was 18.05 minutes in the preliminary screening test and 17.4, 16.1, 19.2, 18.0, 19.5 and 17.0 in the six replicate burning rate tests. The shortest recorded burn time is represented above : 16.1 min (966 sec).

Conclusions:
The burning rate for the sample with nominal particle size of 0.7 -1.0 um was 30 minutes (>20 minutes) in the preliminary screening test. And the burning rate for the sample with nominal particle size of 0.7 um max was 18.05 minutes in the prelimanry screening test and 17.4, 16.1, 19.2, 18.0, 19.5 and 17.0 in the six replicate burning rate tests (over the 250 mm sample length). Therefore, the substance was found to be non-flammable at these particle sizes in this test. Also, it is not considered to be a pyrophoric material.
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
1997-05-02 to 1997-05-16
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Conducted with methodology equivalent to EU methods A.10 and A.13. Limited description of methodology was given.
Qualifier:
equivalent or similar to
Guideline:
EU Method A.10 (Flammability (Solids))
Qualifier:
equivalent or similar to
Guideline:
EU Method A.13 (Pyrophoric Properties of Solids and Liquids)
GLP compliance:
not specified
Test procedure:
burning time (test type not further specified)
Remarks:
or specified in description of method (migrated information)
Burning time:
> 1 200 s
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.

The burning rates for all sample sizes were >20 minutes in the preliminary screening test. Therefore, no further tests were conducted.

Conclusions:
All samples (particle sizes 0.55- 15 um) had burning rate times of greater than 20 minutes in the preliminary screening test. Therefore, the test substance is considered to be non-flammable in this test. Also, it is not considered to be a pyrophoric material.
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well documented study, conducted with methodology equivalent to EU methods A.10. No details on method of size determination.
Qualifier:
equivalent or similar to
Guideline:
EU Method A.10 (Flammability (Solids))
GLP compliance:
not specified
Test procedure:
burning time (test type not further specified)
Remarks:
or specified in description of method (migrated information)
Burning time:
612 s
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.

The burning rate for the preliminary test was 409 s.

The burning rates for the 6 definitive tests were:

10 min 48 sec

11 min 41 sec

11 min 22 sec

11 min 58 sec

The shortest reported burn time is recorded above.

10 min 12 sec

11 min 14 sec

Conclusions:
As the sample (0.6 um in particle size) had a burning rate time of more than 10 minutes (612 seconds (10 minutes and 12 seconds)), the test substance is considered to be non-flammable in this test.

Description of key information

Tungsten carbide was not found to be flammable at any particle size. Testing was conducted down to FSSS size 0.53 um (nominally 0.47 um).

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Justification for classification or non-classification

Tungsten in tungsten carbide its in highest possible oxidation state and incapable of further reaction with oxygen. Thus, tungsten carbide can be considered non-flammable and non-pyrophoric.