Auto-ignition temperature

Objectives

To classify the sensitivity of samples, to measure the risks of auto-ignition of a liquid or solid material and to guarantee the safety of users.

What does the minimum auto-ignition temperature test involve?

This test makes it possible to determine the temperature at which a material ignites spontaneously, in a uniformly heated oxygen pressure chamber.

This test is carried out on non-metallic materials, according to the standards:

EN 1797
NF EN ISO 11114-3
ISO 21010

Test procedure

Our technicians take a small amount (at least 0.06 g) of the sample to be tested: this sample can be liquid or solid.
The sample is placed in a Pyrex sample holder and then in a reaction chamber.
The reaction chamber is sealed and purged with oxygen. Why ? To remove air and any residues from previous combustions.
The reaction chamber is pressurised to 120 bar.
The reaction chamber is heated to a maximum of 500°C.
Temperature and pressure are recorded to determine the auto-ignition temperature of the test sample.