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