What is dust made of percentages
- how big is a dust particle
- how large is a dust particle
- how big are coarse dust particles
- how much does a dust particle weigh
Dust particle size in mm...
Dust particle size chart
When NFPA 654 defines combustible dust it is “any finely divided solid material that is 420 microns or smaller in diameter and presents a fire explosion hazard when dispersed and ignited in air”.
This makes sense on the surface, but do you really understand what size 420 microns actually is?
What is the size of dust particles, and how does this affect cleaning procedures?
To help put this number in perspective, the thickness of both a human hair and a standard piece of paper are 100 microns.
This means that the largest size of hazardous dust is over four times the thickness of paper and hair. The human eye can’t see anything about half that size, at 50 microns. In a gram of dust there can be up to 500 dust mites, which doesn’t get crowded when they are only 10 microns in size.
Other than explosion hazards, how do the different sizes of dust cause issues?
In a typical setting, only about 10% of the dust is large enough to be visible to the naked eye.
Most dust particles are 5 microns or less, which are so sm
- dust particle sizes
- what is a dust particle called