sheathed explosive

sheathed explosive

[′shēthd ik′splō·siv]
(engineering)
A permitted explosive enveloped by a sheath containing a noncombustible powder which reduces the temperature of the resultant gases of the explosion and, therefore, reduces the risk of these hot gases causing a firedamp ignition.
References in periodicals archive ?
It's not surprising that the federal government has a few regulations regarding the use of explosives in mining: 30 CFR, Part 15 (approval of explosives and sheathed explosive units): 30 CFR Part 56, Subpart E (safety and health standards: surface metal and non-metal mines: explosives); 30 CFR Part 57, Subpart E (safety and health standards: underground metal and nonmetal mines: explosives): 30 CFR Part 75, Subpart N (mandatory safety standards: underground coal mines: explosives and blasting); and 30 CFR Part 77, Subpart N (mandatory safety standards: surface coal mines and surface work areas of underground coal mines: explosives and blasting) cover the bulk of it.