Some people say that the risk is bigger when the chip particles size are 500 micrometers or minus? What is the reason of this size?
Metals are ignitable, and create highly explodible atmospher , when in particles or dust. Thin rubbons of magnesium are also flammable.
According to document below, low melting point close to ignition point may be the origin of higher risk with this material.
These fires are very hard to extinguish. Caution. But metal powder allow us to enjoy pyrotechnic spectacles...
I suggest that you can consult Prof. Diego Carou on ResearchGate, who is an expert in "Machining of Mg and Mg alloys".
In book ( "Traditional Machining Processes - Research Advances", edited by J. Paulo Davim):- please see Chapter 5:- "Machinability of Magnesium and Its Alloys: A Review", Diego Carou, Eva M. Rubio, J. Paulo Davim, Traditional Machining Processes, (Materials Forming, Machining and Tribology Series), 2015, pp 133-152 (Springer: DOI 10.1007/978-3-662-45088-8).
The physical and chemical reason of ignitability of small metal particles caused by increasing of their reaction ability to oxygen of air in comparison with large particles. The relation of surface area of particles to their volume is dramatically increasing in course of particle size diminishing.
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