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Physical & Chemical properties

Auto flammability

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Link to relevant study record(s)

Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
other: Company data
Remarks:
SDS information
Adequacy of study:
key study
Study period:
Not relevant - Safety Data Sheet data
Reliability:
2 (reliable with restrictions)
Qualifier:
no guideline followed
Version / remarks:
Internal Company determination
Principles of method if other than guideline:
* Basic Principle
The metal powder or hydride to be tested is placed in a preheated ignition block and the temperature at which self-ignition occurs is noted.

* Procedure
The ignition block consists of an iron cube of 70 mm side length, with holes drilled for the material to be analyzed and a thermocouple. After inserting a thermometer or thermocouple, the block is pre-heated with a blower heater to a temperature just below the anticipated self-ignition point. A small quantity of the sample is then placed in the hole intended for the test material, and the block is heated further with the full blower flame until the powder self-ignites. The corresponding temperature is defined as the ignition point.
To ensure correct determination of the ignition point it is crucial to determine an approximate ignition temperature in preliminary experiments (e.g. app. 150°C for Zr metal powder and app. 200°C for Zr hydride). For the actual measurement, the sample must be added about 10 °C below the predicted ignition point, or else a definite self-ignition will fail to take place.
GLP compliance:
no
Specific details on test material used for the study:
Zirconium hydride grade S
Key result
Auto-ignition temperature:
> 250 °C
Remarks on result:
other: SDS data
Conclusions:
Zirconium hydride holds an auto-ignition value of >250°C. (SDS data - Internal procedure)

Description of key information

Zirconium hydride holds an auto-ignition value of >250°C. (SDS data - Internal procedure)

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
250 °C

Additional information