… prevailing, for instance, in a room, if a 100 W bulb cannot be seen at a 1 m distance. Dangerous dust concentration… prevailing, for instance, in a room, if a 100 W bulb cannot be seen at a 1 m distance. Dangerous dust concentration depends on the grain size and the type of dust. Lower explosion boundary 20 to 60 g/m3;... depends on the grain size and the type of dustSmall solid particles in the atmosphere, which settle due to their own weight, however, can stay airborne in the atmosphere for some time as a dust/air mixture. More. Lower explosion boundaryLower boundary of the area of concentration in which a mixture can be brought to explosion. Lower boundary of the explosion area. 20 to 60 g/m3; upper explosion boundaryUpper boundary of the area of concentration, in which dust mixed with air can be brought to explosion. Upper boundary of the explosive area.: 2000 to 6000 g/m3.
