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Hazard Analysis (KST)

KST Definition

KST, the deflagration index of a dust, is a generalized number used to estimate the anticipated behavior of dust deflagration or explosion. It indicates a dust’s approximate explosive power compared to other dusts.

During KST testing the following are analyzed:

1) Minimum Dust Concentration
2) Minimum Ignition Temperature
3) Minimum Ignition Energy

KST testing is conducted by:

1) Testing bulk samples of dust between 2-2.5lbs for a general NFPA-classified KST number.
2) The samples of dust are taken from several locations such as ceilings, ductwork and corners.
3) The dust is ignited in a clear cylinder and measured.


KST 00No explosion
KST 1> 0 and ≤ 200Weak explosion
KST 2> 200 and ≤ 300Strong explosion
KST 3> 300+Very strong explosion
KST Categories & Explosiveness

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