MSHA - Code of Federal Regulations - 30 CFR 15.22
30 CFR § 15.22
Tolerances for performance, wrapper and specific gravity.
(a) The rate of detonation of the explosive shall be within ±15
percent of that specified in the approval.
(b) The weight of wrapper per 100 grams of explosive shall be within
±2 grams of that specified in the approval.
(c) The apparent specific gravity of the explosive shall be within
±7.5 percent of that specified in the approval.
Subpart C--Requirements for Approval of Sheathed Explosive Units or Other
Explosive Units Designed to be Fired Outside the Confines of a Borehole