Hot-Surface Ignition Temperature Testing

The Hot-Surface Ignition Temperature (HSIT) test determines whether a dust is sensitive to hot surfaces. The hot surface ignition temperature (HSIT) is typically lower than the corresponding minimum auto-ignition temperature (MAIT) of dust in air. This test will determine the hot-surface ignition temperature needed to ignite the material in the dust-layer form. If melting occurs before ignition is seen, the test is inconclusive.


HSIT equipment

The test requires a uniform heated surface. This is achieved with a heated plate placed on top of a commercial hotplate.

Applicable Standard

ASTM E 2021, Standard Test Method for Hot Surface Ignition Temperature of Dust Layers.

Data obtained from this test method provide a relative measure of the hot-surface ignition temperature of a dust layer.

Sample Results

Sample Requirements

Approximately 500 g of material is required.

Sample Preparation

ASTM recommends that dust samples tested be made up of at least 95% minus 200 mesh (75 micron) size particles. However, "as-received" testing of samples is allowed. The decision on sample preparation should be based on how the data is to be used. If you are unsure which sample size is appropriate for your application, call us at 1-844-ioKinetic to discuss.