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Do NOT use chemical cartridge respirators/gas masks when:
>The concentration level of oxygen is unknown or less than 18%.
Use of the respirator may result in death due to lack of oxygen. Use pressure-demand SCBA or pressure-demand airline mask with changeover alarm for emergency air supply in the oxygen-deficient environment.

>The type or concentration level of the toxic gas is unknown.
Chemical cartridge respirator/gas mask cannot be used when the type of gas is unknown, as appropriate cartridge cannot be selected. And the use of chemical cartridge respirator/gas mask is limited within the regulation predefined.

>There is no chemical cartridge/canister that can remove the toxic gas existing in the environment.
Chemical cartridge/canister can remove only the gas that the cartridge/canister are designed to remove. Make sure that the cartridge/canister are appropriate for the working environment prior to each use.

>The mixture of gases with different characteristics exist.
Use pressure-demand SCBA or pressure-demand airline mask (for environment with the concentration level of oxygen is more than 14%).

>The concentration level of toxic gas existing at the working environment exceeds the upper limit where the use of chemical cartridge respirator/gas mask is permitted.

 

>Make sure that facepiece is well fit on the face.

>Do NOT use the respirator if there is beard, sideburns, and/or forelock that come between
face and facepiece, or mustache or chin beard that interferes the operation of
the exhalation valve, or toxic gas or particulates could leak as airtight would not be
maintained.

>Do NOT use the respirator if the wearer has a disorder in respiratory or circulatory
system, or is claimed inappropriate by a doctor.

Selection of Cartridges/Canisters   For toxic gas/particulates co-existing environment
Japanese National Standard sets standards and testing procedures for cartridges/canisters designed to remove halogen gas, organic vapors, carbon dioxide, ammonia and sulfur dioxide, and combination cartridge of particulates and the 5 gases/vapors. No effect may be obtained if cartridges/canisters not appropriate for the working environment are used. Make sure to select and use cartridges/ canisters designed to remove target gas.
 
In toxic gas environment with the presence of particulates, fume and/or mist, use approved particulate pre-filters appropriate for the harmful effects as shown on the table below.

Particulate filtering efficiencies and categories
Test Particulates
Sodium Chloride (NaCl)
Dioctyl phthalate (DOP)
Filtering Efficiency
S1
Over 80.0%
L1
Over 80.0%
S2
Over 95.0%
L2
Over 95.0%
S3
Over 99.9%
L3
Over 99.9%

Examples of the selection of chemical cartridges/gas masks with the use of pre-filter
Description of particulates and Corresponding Works Working environment without oil mist
Working environment with oil mist
Working environment with a possibility of exposure to highly-toxic particulates such as radioactive materials, dioxins, etc
S3 , L3
L3
Working environment with a possibility of exposure to highly-toxic particulates
S3 , L3 , S2 , L2
L3 , L2
Working environment with a possibility of exposure to less toxic particulates
S3 , L3 , S2 , L2 , S1 , L1
L3 , L2 , L1
 
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