Classification of Dusts

KST (bar.m/s) Characteristics Class
KST ≤ 200 Weak explosion St. 1
200 < KST ≤300 Strong explosion St. 2
KST > 300 Strong explosion St. 3

KST value is now used extensively in designing plant explosion relief and suppression systems. Pmax is used in explosion containment design. In the US, NFPA 68 “Guide for Venting Deflagrations” (1998) provides guidance on results and interpretation.

eStrip® GPX media and various plastic abrasive media have KST values ≤ 200 bar.m/s, and thus fall within category St. 1. Consequently the same precautions and engineering controls should be applied to these abrasive products
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