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CODE FOR IDENTIFICATION OF GAS-MASK CANISTERS
DEFINITIONS

Gas mask,
6. The words “gas mask” as used shall be understood to mean a
device designed and constructed so that all air is excluded from the
respiratory system of the wearer except that which is drawn through
a canister forming a part of the gas mask.

Canister,
7. The word “canister” as used shall be understood to mean a
container in which there are filtering, absorbing, adsorbing, neutralzing,
 or catalyzing materials capable of affording protection against
harmful gases, vapors, smokes, and mists, singly or in combination,
also dust in combination with any of these when used in connection
vith, or as part of, a gas mask.

COLORS

8. Each gas-mask canister shall be given a distinctive color in
accordance with the following:
3ases, vapors, smokes, or mists to be protected
against
A. Acid. __ =
B. Organic vapor. . J
C. Ammonia... couce  aunoo.
J. Carbon monoxide. ......_...
E. Acid and organic vapors._.._
F. Acid and organic vapors and
ammonia.
G. Dusts, smokes, mists in combination
 with any of the
above gases.
H. All of the above gases..__..

Red. Filters are included in this
canister, but stripes to indicate
them are unnecessary.
I. Other special gases. .____... | Color to be assigned.
Nore.—This code was formulated through the cooperation of the National
Safety Council, United States Bureau of Mines, and American Standards Assodation.
 These agencies will be glad to consider requests for additional color
1ssigniments for other possible gases or combinations if such gases assume imporbance
 in industry.

9. All colors used shall be such as to be clearly identified by the
user and clearly distinguishable one from another. When more than
one color is used there shall be a decided contrast between them.
10. The color coatings used shall offer a high degree of resistance to
:hipping, scaling, peeling, blistering, fading, and to the effects of
chemical fumes, smokes, gases, moisture, and dusts in the ordinary
atmospheres to which they may be exposed under normal conditions of
storage and usage.