- American Industrial Hygiene Association
(AIHA)
Contact MSA at 1-800-MSA-2222 for infor-
mation.
EXPOSURE LIMITS FOR MIXTURES
The American Conference of Governmental
Industrial Hygienists (ACGIH) publishes the
following information to determine the TLV of
a mixture.
First, determine the total concentration of
the chemical mixture (C
Mixture
) from the indi-
vidual contaminant concentrations (C
1
, C
2
,
C
3
...) using the following formula:
C
Mixture
= C
1
+C
2
+C
3
+...
The TLV of the mixture is found by using the
following formula where T
1
, T
2
, T
3
, ... are the
individual contaminant TLVs and C
1
, C
2
, C
3
...
are the individual contaminant concentra-
tions:
Only use these equations if the contami-
nants present are actually mixed. Some
substances do not mix and may be present
separately, for example, in pockets or at dif-
ferent levels. In that case, the lowest TLV of
the substances present must be used to
determine the appropriate respirator catego-
ry for protection against all contaminants
present.
See MSA’s
Response Respirator Selector
for additional information.
GENERAL DESCRIPTION
LVG 322 (L) Rev. 13 - 10050775
12
T
Mixture
=
C
Mixture
+
+
+ . . .
T
1
T
2
T
3
C
1
C
2
C
3
Содержание Ultra Elite P100
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