Calcium hexaboride

Auto flammability

Administrative data

Endpoint:

relative self-ignition temperature (solids)

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1992

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study has been performed according to German guidelines by an independent laboratory.

Qualifier:

according to guideline

Guideline:

other: VDI 2263, Blatt 1: "Staubbrände und Staubexplosionen, Gefahren - Beurteilung - Schutzmaßnahmen; Untersuchungsmethoden zur Ermittlung von sicherheitstechnischen Kenngrößen von Stäuben"

GLP compliance:

not specified

Specific details on test material used for the study:

400-mesh powder (<30 µm) as commercially available

Key result

Test procedure:

other: screening test

Remarks:

VDI 2263

Remarks on result:

other: Flammability class

Remarks:

BZ2

Specific observation on the dusts were not provided. Commercial calcium boride powder was assigned a flammability class of BZ2. Filter dust (not commercially available) was assigned a flammability class of BZ4.

Interpretation of results:

non flammable

Conclusions:

According to the results of the evaluation on burning behaviour, BZ2 has been assigned to calcium hexaboride powder and BZ4 has been assigned to CaB6 filter dust. Based on the burning behaviour of CaB6 in this test, it can be concluded that CaB6 as commercialized does not have to be classified as highly flammable. No labelling is required for CaB6.

Executive summary:

The test was performed under a German national guideline (VDI 2263) by an authority involved in occupational safety. The method is considered a suitable screening level flammability test under CLP. The result is deemed reliable with restrictions and suitable for Classification & Labeling.

Cross-reference 2

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

melting point/freezing point

Type of information:

not specified

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Principles of method if other than guideline:

no data

GLP compliance:

no

Type of method:

other: no data

Key result

Melting / freezing pt.:

2 235 °C

Remarks on result:

other: no data on pressure

Conclusions:

The melting point of CaB6 is reported as 2235 °C.

Executive summary:

The melting point of CaB6 is reported as 2235 °C. Because this data is available in a handbook, it is considered reliable with restrictions.