---
kind: "section"
citation: "42 C.F.R. § 84.126"
title: "42"
number: "84.126"
heading: "Canister bench tests; minimum requirements."
url: "https://uscodex.org/cfr/42/84.126"
---

# §84.126. Canister bench tests; minimum requirements.

- (a)
  - (1) Bench tests, except for carbon monoxide tests, will be made on an apparatus that allows the test atmosphere at 50 ±5 percent relative humidity and room temperature (25 ±2.5 °C.) to enter the canister continuously at concentrations and rates of flow specified in Tables 5, 6, and 7 of this subpart.
  - (2) Three canisters will be removed from containers and tested as received from the applicant.
  - (3) Two canisters, other than those described in [paragraph (a)(2)](#a-2) of this section, will be equilibrated at room temperature by passing 25 percent relative humidity air through them at 64 liters per minute for 6 hours.
  - (4) Two canisters, other than those described in [paragraphs (a)](#a) (2) and (3) of this section, will be equilibrated at room temperature by passing 85 percent relative humidity air through them at 64 liters per minute for 6 hours.
  - (5) The equilibrated canisters will be resealed, kept in an upright position at room temperature, and tested within 18 hours.
- (b) Front-mounted and back-mounted gas mask canisters will be tested and shall meet the minimum requirements set forth in Table 5 of this subpart.
- (c)
  - (1) Front-mounted, and back-mounted, and chin-style canisters designated as providing respiratory protection against gases, ammonia, organic vapors, carbon monoxide and particulate contaminants shall have a window or other indicator to warn the gas mask wearer when the canister will no longer satisfactorily remove carbon monoxide from the inhaled air.
  - (2) Other types of front- and back-mounted canisters may also be equipped with a window or other indicator to warn of imminent leakage of other gases or vapors.
  - (3) The window indicator canisters will be tested as regular canisters, but shall show a satisfactory indicator change or other warning before the allowable canister penetration has occurred.
- (d) Chin-style gas mask canisters shall meet the minimum requirements set forth in Table 6 of this subpart.
- (e) Escape gas mask canisters shall meet the minimum requirements set forth in Table 7 of this subpart.
- (f) Powered air-purifying respirators with a canister(s) and particulate filter(s) must meet the as-received minimum service-life requirements and half of the equilibrated minimum service-life requirements set forth in Tables 5, 6, and 7 of [subpart I](/cfr/42/subpartI.md) using the flows specified in [subpart K](/cfr/42/subpartK.md), [§ 84.175(b)](/cfr/42/84.175.md?p=b) and equilibrated in accordance with [paragraphs (a) through (e)](#a..e) of this section using the flows specified in [subpart K](/cfr/42/subpartK.md), [§ 84.175(b)](/cfr/42/84.175.md?p=b).

## Notes

### Amendments

[60 FR 30355, June 8, 1995, as amended at 85 FR 20607, Apr. 14, 2020]

### Authority

Authority: 29 U.S.C. 651 et seq.; 30 U.S.C. 3, 5, 7, 811, 842(h), 844.

### Source

Source: 60 FR 30355, June 8, 1995, unless otherwise noted.

### Amendments

[60 FR 30355, June 8, 1995, as amended at 85 FR 20607, Apr. 14, 2020]