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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
Lead Chromate7758-97-6NRP1002730N100
2360P100
7940/7990
8940/8990
0.05mg/m3 (t) as Pb;
0.012mg/m3 (t) as Cr
t-A2; substance for which ACGIH BEI exists
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
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.
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
Hydrogenated Terphenyls61788-32-7RP2740R95
7940/7990
8940/8970/8990
0.5 ppm (t)
Coal Tar Pitch Volatiles (as Benzene Solubles)65996-93-20RP2740R95
7940/7990
8940/8990
0.2 mg/m3 (o)(t)80mg/m3Confirmed Human Carcinogen; t-A1
Triorthocresyl Phosphate78-30-8R/P2740R95
7940/7990
8970/8940
8990
0.1 mg/m3 (o)(t); -skin-
40 mg/m3t-A4, substance for whichas ACGIH BEI exists (Acetylcholinesterase Inhibiting Pesticide)
Di-sec-octylphthalate117-81-7RP2740R95
7940/7990
8970/8940/8990
5 mg/m3 (o)(t);5,000 mg/m3ACGIH NIC to delete STEL; t-A3
Paraffin Wax Fume8002-74-2RP2740R95/
2360P100/8970
7940/7990
8940/8990
2 mg/m3
Glycerin, Mist56-81-5RP2740R95/8970
7940, 7990
8940, 8990
Total dust 15 mg/m3 (o),
10 mg/m3 (t)
Respirable fraction
5 mg/m3 (o)

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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