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Combustible Dust KST Test Results

Insurance Engineer

Registered User
Dec 9, 2009

This German web site lists about 4600 dusts that have been tested for KST/ST values. This information can be used to determine IF the materiel presents a possible dust explosion hazard.

Examples of Kst Values for Different Types of Dusts

Dust explosion class* Kst (bar.m/s)*

St 0 No explosion

St 1 >0 and = 200 Weak explosion

St 2 >200 and = 300 Strong explosion

St 3 >300 Very strong explosion

The actual class is sample specific and will depend on varying characteristics of the material such as particle size or moisture.

* OSHA CPL 03-00-008 - Combustible Dust National Emphasis Program.

** NFPA 68, Standard on Explosion Prevention by Deflagration Venting.

From the web site


Important combustion and explosion characteristics of more than 4600 dust samples from virtually all sectors of industry were determined as a basis for the safe handling of combustible dusts and for the planning of preventive and protective measures against dust explosions in dust-generating and processing plants.

The present database was realised with the financial support of the European Commission. The database was elaborated in co-operation with:

Federal Institute for Materials Research and Testing - BAM, Berlin, Germany Institution for statutory accident insurance and prevention of the foodstuffs industry and the catering trade (Berufsgenossenschaft Nahrungsmittel und Gastgewerbe - BGN, Mannheim, Germany) Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA, Institute for Occupational Safety and Health of the German Social Accident Insurance, Sankt Augustin, Germany) DMT-Gesellschaft für Forschung und Prüfung mbH (association for research and testing), expert body for surface fire and explosion protection - mining test facility, Essen, Germany Henkel KGaA, Düsseldorf, Germany.