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Chemical Respiratory Guide


Chemical Agent
CAS Number
Chemical Respiratory Chart

Download a printable version

Chemical NameCAS NumberFilter TypeSuggested ProductTLV(t) PEL(o)IDLHComments
Uranium (Natural)*, Soluble Compounds (as U)7440-61-1AG/P1007200+7940
8200+8940
0.05 mg/m3(o);
0.2 mg/m3 (t);
0.6 mg/m3 (s)-(t)
10 mg/m3
(as U)
{water soluble}
t-A1
Refer to 10CR20 Subpart H
Hafnium & Compounds, Dusts & Mists7440-58-6
N
EZ22/EZ23N95
2200/2300N95
26002700N95

0.5 mg/m3 (o)(t)
50 mg/m3 (as Hf)
Copper, Dusts and Mists (as Cu)7440-50-8NEZ22/EZ23N95
2200/2300N95
2600/2700N95
1.0 mg/m3 (o)(t)
{water based mists}
100 mg/m3
Copper, Fume (as Cu)7440-50-8N2310/2315N99
2400/2800N95
0.1 mg/m3(o);
0.2 mg/m3 (t)
100 mg/m3
Cobalt, Metal Dusts and Fumes (as Co)7440-48-4NRP1002730N100
2360P100
7940/7990
8940/8990
0.1 mg/m3(o);

0.02 mg/m3 (t)
20 mg/m3t-A3; substances for which an ACGIH BEI exists
Chromium, Metal (as Cr)7440-47-3NEZ22/EZ23N95
2200/2300N95
2600/2700N95
0.5mg/m3 (t);
1mg/m3 (o)
250mg/m3For specific information, refer to:
NIOSH Pocket Guide to Chemical Hazards;
t-A4
Graphite (Synthetic) all forms except fibers)7440-44-0
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
Total dust 15 mg/m3 (o);
Respirable fraction
5 mg/m3 (o), 2.0 mg/m3 (t)*
*All forms except graphite fibers
Cadmium, Dust as Cd7440-43-9; variesNRP1002730N100
2360P100
7940/7990
8940/8990
Total (inhalable) dust/particulates
0.005 mg/m3 (o) 0.01 mg/m3 (t);
Respirable 0.002 mg/m3 (t)
9 mg/m3See 29CFR1910.1027 and Table Z-2;
O-Ca; t-A2. Substance for which an ACGIH BEI exists.
Cadmium, Fume7440-43-9NRP1002730N100
2360P100
7940/7990
8940/8990
Total (inhalable) dust/particulate
0.005 mg/m3 (o) 0.01 mg/m3 (t);
Respirable 0.002 mg/m3 (t)
9 mg/m3See 29CFR1910.1027 and Table Z-2; O-Ca; t-A2. Substance for which an ACGIH BEI exists.
Beryllium & Compounds (as Be)7440-41-7NRP1002730N100
2360P100
8940/8990
7940/7990
0.002mg/m3 (o)(t)
0.005mg/m3 (c)-(o);
0.01 mg/m3 (c)-(t) [0.025mg/m3 for
30 min. peak/8 hr. shift (c)-(o)]
4mg/m3t-A1; ACGIH NIC to 0.0005 mg/m3 (inhalable fraction), 0.0002 STEL/CEIL (inhalable fraction) SEN, Skin.

EXPLANATION OF GUIDE FORMAT


  • OSHA PermissibleExposure Limits (PEL)
  • American Conference of GovernmentalIndustrial Hygienists (ACGIH)
  • Threshold Limit Values (TLV)
  • ChemicalAbstracts Service (CAS)
  • IDLH (Immediately Dangerous to Life and Health)<
  • LEL (Lower Explosion

Filter Type

  • "N" means Dusts and Non-Oil Based Mists
  • "R" means Dusts, and Oil and Non-Oil Based Mists with time restrictions
  • "P" means Dusts and Oil and Non-Oil Based Mists, extended life for Dusts and Non-Oil Based Mists
  • "AM" means Ammonia/Methylamine
  • "AG" means Acid Gas
  • "FORM" means Formaldehyde
  • "OV" means Organic Vapor
  • "OV/AG" means Organic Vapor/Acid Gas
  • "MULTI" means Multi Gas/Vapor
  • "95" means 95% efficient
  • "99" means 99% efficient
  • "100" means 99.97% efficient
  • "/" means OR. For example, 8970/8940 means you may use either filter.
  • "FF" means full face respirator; 9000 is sugg

TLV(t) PEL(o)

  • An "o" next to exposure limit indicates it is an OSHA PEL.
  • A "t" indicates it is an ACGIH TLV.
  • A"c"indicates that it is a ceiling valuewhich refers to the concentrationthat should not be exceeded at anytime during work exposure.
  • An"s" appears next to a limit this indicates that it is a short termexposure limit (STEL
  • A "skin" designation indicates that the substance can be absorbed throughthe skin, eyes or mucous membranes and appropriate measures must betaken to avoid absorption.
  • A "SEN" indicates TLV-confirmed potential for worker sensitization as a resultof dermal contact and/or inhalation exposure based on the weightof scientific evidence.
Comments list any additional points that should be noted.
ACGIH designates carcinogens as follows:
  • TLV-A1 (t-A1): Confirmed Human Carcinogen
  • TLV-A2 (t-A2): Suspected Human Carcinogen
  • TLV-A3 (t-A3): Confirmed Animal Carcinogen with Unknown Relevance to Humans
  • TLV-A4 (t-A4): Not Classifiable as a Human Carcinogen
  • TLV-A5 (t-A5): Not Suspected as a Human Carcinogen
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