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flammable solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October 11, 2017 (Study initiation) - November 17, 2017 (Study termination)
1 (reliable without restriction)
according to guideline
UN Manual of Tests and Criteria: Test N.1 (Test method for readily combustible solids)
Version / remarks:
rev. 6
Principles of method if other than guideline:
The test item is loosely filled into a mould. The mould is made of metal, has a length of 250 mm and a triangular cross section with an inner height of 10 mm and an inner width of 20 mm. On both sides of the mould in a longitudinal direction two metal sheets are mounted as lateral limitations which project 2 mm beyond the upper edge of the triangular cross section. The mould is dropped three times from a height of 2 cm onto a solid surface. If necessary the mould is filled up again. Then the lateral limitations are removed and the excess substance is scraped off. A non-combustible and non-porous plate is placed on top of the mould, the apparatus is inverted and the mould is removed.

As ignition source a flame is used to ignite the pile at one end.
GLP compliance:
yes (incl. QA statement)
Specific details on test material used for the study:
- Test item: Zirkonhydrid S
- Batch No.: 79408
- Identity: 97.3% Zr
- Physical state: Dark grey powder
- Storage conditions: Ambient temperature (10 octo 30 °C), under inert gas
- Expiry date: September 11, 2018

Key result
Test procedure:
burning rate test over 100 mm length
Burning time:
ca. 38 s
Interpretation of results:
Category 1 (flammable solids) based on GHS criteria
The flammability of zirconium hydride was tested according to UN Manual of tests and criteria N°1. The burning time was faster than 45 s and the flame passed the wetted zone. Due to these results, ZrH2 is classified as flammable solid, category 1.

Description of key information

Key value for chemical safety assessment


Additional information

Justification for classification or non-classification