30 CFR § 15.21 - Tolerances for ingredients.

---
identifier: "/us/cfr/t30/s15.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 15.21 - Tolerances for ingredients."
title_number: 30
title_name: "Mineral Resources"
section_number: "15.21"
section_name: "Tolerances for ingredients."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "B"
subchapter_name: "TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS"
part_number: "15"
part_name: "REQUIREMENTS FOR APPROVAL OF EXPLOSIVES AND SHEATHED EXPLOSIVE UNITS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 957."
regulatory_source: "53 FR 46761, Nov. 18, 1988, unless otherwise noted."
cfr_part: "15"
---


# 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 of total explosive or sheath) | Tolerance 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 |