Assertion: fused magnesia | /r/ObjectUse | used as a filler material
Facets:
value: for some time
type: TEMPORAL
value: for commercial use
type: PURPOSE
Source sentences:
text: For the manufacture of heating elements for electric stoves for domestic use and also for commercial use, fused magnesia has for some time been used as a filler material to fill the steel sheath surrounding the resistance wire or wires, this fused magnesia being the insulating material preventing short-circuit.