MSHA - Code of Federal Regulations - 30 CFR 15.21
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MSHA - Title 30 CFR
30 CFR § 15.21
Tolerances for ingredients.
Tolerances for each ingredient in an explosive, which are expressed as a percentage of the total explosive, shall not exceed the following:
(a) Physical sensitizers: The tolerances established by the applicant;
(b) Aluminum: ±0.7 percent;
(c) Carbonaceous materials: ±3 percent; and
(d) Moisture and ingredients other than specified in paragraphs (a), (b), and (c) of this section: The tolerances specified in Table II.
TABLE II.--TOLERANCES FOR MOISTURE AND OTHER INGREDIENTS

             +-------------------------------------+-----------+
             | Quantity of ingredients (as percent | Tolerance |
             |    of total explosive or sheath)    |  percent  |
             +-------------------------------------+-----------+
             | 0 to 5.0............................|    1.2    |
             | 5.1 to 10.0.........................|    1.5    |
             | 10.1 to 20.0........................|    1.7    |
             | 20.1 to 30.0........................|    2.0    |
             | 30.1 to 40.0........................|    2.3    |
             | 40.1 to 50.0........................|    2.5    |
             | 50.1 to 55.0........................|    2.8    |
             | 55.1 to 100.0.......................|    3.0    |
             +-------------------------------------+-----------+