Assertion: hafnium | /r/HasProperty | pyrophoric
Facets:
value: in powdered form
type: OTHER
Source sentences:
text: Hafnium is pyrophoric (ignites spontaneously) in powder form.
text: In powdered form it is pyrophoric (can ignite spontaneously).
text: Hafnium is distinguished by corrosion resistance in pure water and water vapor up to 400° C. Powdered hafnium is pyrophoric.
text: The connection that hafnium is somewhat pyrophoric, and that some other pyrophoric material is used for this is a bit of a stretch.