Dusts, Classification of
Dusts, Classification of :
Dusts are classified for explosibility as follows: Group (a) Dusts which ignited and propagated flame in the test apparatus. Group (b) Dusts which did not propagate flame in the test apparatus. Dusts are classified in group (a) if they ignited and propagated flame in any of three tests with a small source of ignition, either `as received' on after sieving and drying the sample. Group (a) dusts are explosible and liable to give rise to a dust explosion whereas Group (b) dusts are non explosible. Examples of Group (a) dusts are sodium carboxy methyl cellulose, cork, dextrin, and magnesium and Group (b) polyvinylidene chloride and calcium citrate. The tests are carried out in the Vertical tube apparatus, the Horizontal tube apparatus and the Inflammator
