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Instruction Manual
EXPOSURE LIMITS
The exposure limit of the present contaminants can be obtained in the standards department of the
government with jurisdiction over the user (NIOSH, SSST do MTE).
The permissible exposure limits from OSHA (PELs) are found in the Air Contaminants Standard
29 CFR 1910.1000.
NIOSH recommended exposure limits (RELs) were published in the NIOSH Pocket Guide to
Chemical.
If it is not possible to get the exposure limit of the contaminant from one of the sources above, use the
threshold values (TLVs) from the American Conference of Governmental Industrial Hygienists
(ACGIH's).
THE USER ASSUMES EVERY RISK OF DEATH AND SERIOUS PERSONAL INJURY WHICH
MAY OCCUR IF THE FIT TEST IS NOT PERFORMED OR IF THE RESPIRATOR LIMITATIONS
ARE NOT FOLLOWED.
Exposure Unities for Mixtures
The American Conference of Governmental Industrial Hygienists (ACGIH) has published the following
information to determine the TLV of a mixture:
First determine the total concentration of the chemical mixture (C
contaminant concentration (C
C
= C
+ C
+ C
Mixture
1
2
The TLV of the mixture is found by using the following formula where T
contaminant TLVs and C
C
T
=
Mixture
C1 + C2 + C3 + ...
T1
T2
Only use these equations if the contaminants present are actually mixed. Some substances do not
mix and may be present separately; for example, in pockets or in different levels. In that case, the
lowest TLV of the substances present must be used to determine the appropriate respirator category
for protection against all contaminantes present. See MSA's Response Respirator Selector (P/N
697254) for additional information.
42
, C
, C
...), using the following formula:
1
2
3
+ ...
3
, C
, C
are the individual contaminant concentrations:
1
2
3
Mixture
T3
) from the individual
Mixture
, T
, T
... are the individual
1
2
3
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