Fire hazard rating of zinc powder
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Should the fire hazard classification of zinc powder be Class A or Class B?
Zinc powder is a strong reducing agent that readily reacts with oxygen in the air. It also has a very low melting point of 420°C; molten zinc can thus serve as a source of fire, for example by flowing to lower areas and causing new fires. Pay for Hazard Category 4.2
Does it belong to Category A or Category B? Some sources classify it as Category B; according to the building codes, it falls under Category A, Item 4 – substances that, at normal temperatures, in contact with water or water vapor in the air, can produce flammable gases that may lead to combustion or explosion ； Do you think it belongs to Category A as well?
Class C combustible solids, I guess. I can’t do that; check the building codes and safety manuals instead.
Metallic potassium and sodium belong to Category A; should zinc also belong to Category A?
Zinc is definitely not as effective as potassium and sodium; they belong to Group 1, while zinc is far inferior. But besides fire protection, should the poster also consider explosion prevention?
The hazardous category of zinc must be determined first in order to determine the safety measures to be taken
I remember that the order of reducing properties is: potassium, calcium, sodium, magnesium, aluminum; zinc, iron, tin, lead (hydrogen); copper, mercury, silver, platinum, gold. The order of metal reactivity is: K, Ca, Na, Mg, Al, Zn, Fe, Sn, Pb (H), Cu, Hg, Ag, Pt, Au. ———————————————————————→ Metal reactivity decreases gradually. Magnesium powder and aluminum powder are classified as Category B according to the relevant regulations, and zinc, being after them, should also be classified as the fourth item in Category B
What was said on the 8th floor is correct. We have previously worked on zinc powder projects, and the fire hazard of zinc powder was classified as Category B.