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8
C. Comments regarding warning
properties have been removed as
OSHA allows air purifying respirators to
be used against gases and vapors with
poor or unknown warning properties.
Instead cartridge change schedules
based on objective information and
data must be established.
D. These compounds have been
identified as possibly existing in both
particulate and vapor phase in the
workplace. For these compounds, 3M
recommends that a gas/vapor
cartridge be used in addition to the
traditionally accepted particulate
filter. It is the user’s responsibility
to determine whether both forms
coexist. Both chemical properties and
use conditions/processes
can affect the physical form in the
workplace. Users should consider
Format Explanation
specific exposure data and
workplace conditions before making
their final selection.* If a chemical
cartridge is used, a change schedule
must be e
stablished to replace the
cartridges before the end of their
service life.
E. These compounds have been identied
as possibly existing in both vapor and
particulate phase in the workplace.
Even though these chemicals would
be expected to be in the vapor phase,
when other aerosols are present or
there is high humidity, it is possible
that the vapor may be adsorbed onto
these coexisting particles or dissolved
in available water droplets; therefore,
3M recommends a lter for the
particulate phase be used in addition
to the traditionally accepted chemical
cartridge. It is the user’s responsibility to
determine whether both forms coexist.
Both chemical properties and use
conditions/processes can aect the
physical form in the workplace. Users
should consider specic exposure
data and workplace conditions before
making their nal selection.*
F. It is believed that an N-series filter is
sufficient since these materials will not
coa
t the filter fibers, but since this
material may contain oil aerosols, an
R- or P-series filter is recommended
until further research or a regulatory
agency takes a specific position.
G. R- or P-series filters have been
recommended pending more research
as to how these materials affect the
filter fibers.
H. Listing of 3M 3510, 3530, 3550, or
3720 refers to a 3M
™
Personal Air
Monitor with Pre-Paid Analysis.
* See Perez, C. and S. C. Soderholm: Some Chemicals Requiring Special Consideration When Deciding Whether to Sample the Particle, Vapor, or Both Phases of an
Atmosphere. Appl. Occup. Hyg. 6(10): 859-864 (1991).
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