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60
Graphite (natural)
7782-42-5
B
lack lead, Corbo minerals,
Plumbago, Potelot, Silver lead
TWA=2 mg/m
3
(respirable fraction)
N95
Graphite (synthetic)
7440-44-0
TWA=15 mg/m
3
(OSHA)
TWA=2 mg/m
3
(respirable fraction)
N95
Hafnium and compounds
(as Hf)
7440-58-6
TW
A=0
.5 mg/m
3
N95
Halothane
151-67-7
2
-Br
omo-2-chloro-1,1,1-
triî¡Šuoroethane
TWA=50 OV
Short service life.
Heptane (all isomers)
142-82-5
590-35-2
565-59-3
108-08-7
591-76-4
589-34-4
n-Heptane, normal Heptane 5000 TW
A=400
STEL=500
OV 3M 3510 Monitor
Hexachlorobenzene
118-74-1
Perchlor
obenzene TWA=0.002 mg/m
3
-skin-
N95
Hexachlorobutadiene
87-68-3
He
xachloro-1,3-butadiene;
Perchlorobutadiene
TWA=0.02
-skin-
(F)OV
Hard metals containing
cobalt and tungsten
TWA=0.005 mg/m
3
(thoracic fraction)
N95
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