Minimum Explosible Concentration Testing

Often called the LEL (lower explosive limit), the minimum explosible concentration (MEC) provides insight into the minimum amount of combustible dust that will explode when dispersed in air. This data can be used to define prevention methods against combustible dust explosions.

Instrument

20-L Sphere Apparatus manufactured by Kühner AG of Switzerland

Applicable Standard

ASTM E 1515 Standard Test Method for Minimum Explosible Concentration of Combustible Dusts.

Results of this test may be used as elements of a fire risk assessment that takes into account all of the factors that are pertinent to an assessment of the fire hazard of a particular end use.

Sample Results

Sample Requirements

Approximately 100 g of material is required.

Sample Preparation

A note on particle size and moisture level for testing. ASTM recommends that dust samples tested be made up of at least 95% minus 200 mesh (75 micron) size particles and less than 10% moisture. 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/dryness level is appropriate for your application, call us at 1-844-ioKinetic to discuss.