been tested and approved against certain contaminants. See Table 2-1 for a
description of the label that is required on the canister of all gas masks, and Table 2-2
for the color code used for gas mask canisters.
Chemical cartridge respirators.
(a) Description. Chemical cartridge respirators (see Figure 2-13)
include all completely assembled respirators which are designed for use as respiratory
protection during entry into or escape from atmospheres not immediately dangerous to
life and health, and are described according to the specific gases or vapors against
which they are designed to provide respiratory protection (see Table 2-3). Each device
may contain the following component parts, as appropriate: face pieces (half mask or
full), mouthpiece, hood or helmet, cartridge, with filter, harness, breathing tube, and
1. On each canister shall appear in bold letters the following on
the most conspicuous surface or surfaces of the canister:
(Name for atmospheric contaminant)
In addition, essentially the following wording shall appear beneath
the appropriate phase on the canister label: "For respiratory
protection in atmospheres containing not more than.
percent by volume of. "
2. Canisters having a special high-efficiency filter for protection
against radio nuclides and other highly toxic particulates shall be
labeled with a statement of the type and degree of protection afforded
by the filter. The label shall be affixed to the neck end of, or to
the gray stripe, which is around and near the top of, the canister.
The degree of protection shall be marked as the percent of penetration
of the canister by a 0.3-micron diameter dioctyl phthalate (DOP) smoke
at a flow rate of 85 liters per minute.
3. Each canister shall have a label warning that gas masks should be
used only in atmospheres that are not oxygen deficient (at least 19.5
percent oxygen by volume at sea level), since gas mask canisters are
only designed to neutralize or remove contaminants from the air.
Table 2-1. Labels for gas mask canisters.