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membranes.
**Short term exposure limit
***Time-weighted average
General
For Fumigants
Every effort will be made by management and workers to prevent
exposure of PPQ personnel to atmospheres containing dangerous
concentrations of toxic fumigants or other pesticides, or to
atmospheres where there is an oxygen deficiency. However, if an
emergency situation develops where personnel may be exposed, only
respiratory protective equipment with a pressure-demand regulator
shall be used. This includes self-contained breathing apparatus
(SCBA), air supplied respirators, and units combining these two types.
(In this manual the term “SCBA” may be read to include all three of
these types.) The pressure-demand respirator affords the best
protection currently available because positive air pressure is
maintained in the full face mask at all times.
For Pesticides Other Than Fumigants
When there is doubt as to the selection of proper respiratory
protection in either of the following categories, the device which offers
the best protection must be used. The determination of the type can
be made by consulting this manual, the pesticide label, and the
supervisor.
Air Purifying Respirators
Air purifying respirators using either a full face mask or half face mask
are acceptable in areas where concentrations below maximums
designated on the canisters can be expected. They may also be used
during application of pesticides with a toxicity or concentration known
to pose little or no danger when applied correctly.
Dust Masks
Dust masks may be used when particulate matter such as dust, insect
scales, aerosol, spray, or other particles are a nuisance and are of low
or moderate toxicity.
Employee Acceptance
The wearer’s acceptance of respiratory protection depends on
facepiece comfort, clear and full vision, weight of the device, breathing
resistance, individual physical condition, and personal preference. If
more than one device with the proper facepiece seal is approved for the
conditions, then the most comfortable device may be used by the
Equipment
Capabilities and Limitations
8-1-14 Treatment Manual 06/2004-01
PPQ
individual. PPQ will use only respiratory protective equipment tested
and certified by the National Institute for Occupational Safety and
Health (NIOSH), and carrying an approval number prefixed by “TC.”
Capabilities and Limitations
Self-Contained Breathing Apparatus (SCBA)
Breathing air is carried in a tank by the user. When properly fitted and
used according to instructions, the positive pressure-demand system
will prevent harmful contaminants from entering and will provide
breathing air in low oxygen areas. A warning device indicates when the
air supply is low and allows adequate time for leaving the area. The
individual must know that only 5 to 7 minutes air remain at the alarm
and that a proper evacuation route must be planned in advance. Each
unit should be tested to determine the time remaining at the sound of
the alarm.
Limitations
The time which the device will provide respiratory protection is limited
by the amount of air in the tank. Rapid breathing due to stress will
use the air supply more quickly. There is no protection against skin
irritation from toxic gases with the self-contained breathing
apparatus. Since some chemicals such as HCN or pesticide groups
like the organo-phosphates can be absorbed through the skin,
splashes of liquid fumigants or other pesticides must be avoided and
protective clothing worn to protect against accidental exposure.
Gas and Vapor Removing Respirators
Canisters and cartridges can be used as protection from most
pesticides other than fumigants. The type of canister must be selected
for a specific gas or vapor or combinations of gases or vapors. These
devices have the advantage of being small, light, and simple in
operation.
Limitations
Canisters and cartridges are not effective in oxygen-deficient
atmospheres. There is no protection from skin irritations or absorption
of pesticides through the skin. The capacity of the cartridge or canister
determines the maximum contaminant concentration against which a
purifying respirator will protect. The maximum concentration for
which a canister is designed is printed on the label. Cartridges do not
have this information. No protection is provided against particulate
contaminants, unless specified on the canister or cartridge label.
Equipment
Capabilities and Limitations
06/2004-01 Treatment Manual 8-1-15
PPQ
The unit will not provide full protection unless the facepiece is
　
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