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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
Arsenic, Elemental & Inorganic Compounds (except Arsine) (as As)*7440-38-2NRP1002730N100
2360P100
8940/8990
7940/7990
0.01mg/m3 (o)(t)5mg/m3*See 29CFR1910.1018; O-Ca; t-A1; substance for which an ACGIH BEI exists
Chromium (VI) Compounds; Certain Water Insolubles (as Cr)
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
0.01mg/m3 (t);
0.005mg/m3 (o)
as Cr(VI)
15mg/m3t-A1; For specific information, refer to OSHA 29CFR1910.1026
Lithium Hydride7580-67-8NEZ22/EZ23N95
2200/2300N95
2600/2700N95
0.025 mg/m3 (o)(t)0.5 mg/m3
Mercury Inorganic Compounds (as Hg) (except Alkyls)7439-97-6
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
0.025 mg/m3(t);
0.1 mg/m3 (c)-(o); -skin-
10 mg/m3For dust with no vapor pressure; t-A4
Trimellitic Anhydride552-30-7OV/N7100+8910
8100+8910
0.04 mg/m3 (c)-(t)ACGIH NIC to 0.0005mg/m3 Measured as inhalable fraction and vapors & 0.002 mg/m3 (c) Measured as inhalable fraction and vapors
Lead, Metal* & Inorganic Compounds (Dust and Fume)7439-92-1NRP1002730N100
2360P100
7940/7990
8940/8990
0.05 mg/m3 (o)(t)100mg/m3
(as Pb)
See 29CFR1910.1025 t-A3, Substance for which an ACGIH BEI exists; 29CFR1910.62 Construction standard
Sodium Fluoroacetate62-74-8NEZ22/EZ23N95
2200/2300N95
2600/2700N95
0.05 mg/m3 (o)(t);
-skin-
2.5 mg/m3
Vanadium Pentoxide Dust (as V2O5)1314-62-1
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
0.05 mg/m3 (t);
Respirable dust
0.5 mg/m3 (c)-(o)
35 mg/m3 (as Vt-A4, Substance for which an ACGIH BEI exists. ACGIH NIC to 0.05 mg/m3 measured as inhalable fraction of the aerosol and t-A3
Uranium (natural*), insoluble compounds (as U)*7440-61-1NRP1002730N100
2360P100
8940/8990
0.05 mg/m3(o)
0.2 mg/m3 (t);
0.6 mg/m3 (s)-(t)
10 mg/m3
(as U)
t-A1
Refer to 10CFR20 Subpart H
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

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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