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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
Pyrethrum8003-34-7OV/P1007100+7940
8100+8940
5 mg/m3 (o)(t)5,000 mg/m3t-A4
Paraffin Wax Fume8002-74-2RP2740R95/
2360P100/8970
7940/7990
8940/8990
2 mg/m3
Petroleum Distillates (Naptha)8002-05-9OV7100
8100
500 ppm (o)1,100 ppm;
[10% Lower explosion limit]
Odors vary. Must have good warning properties to use 8100. Specific TLV’s apply
Methyl Methacrylate80-62-6OV7100
8100
100 ppm (o)
50 ppm (t)
100 ppm (s)(t)
1,000 ppmt-A4; SEN
2-Nitropropane79-46-9OV7100
8100
10 ppm (t)
25 ppm (o)
100ppm
1,1,2,2 Tetrachloroethane79-34-5OV7100
8100
1 ppm (t)
5 ppm (o) -skin-
100ppmt-A3
1,1,2,2-Tetrabromoethane79-27-67100
8100
1.4ppm (t)*
1ppm (o)
8ppmMeasured as inhalable fraction and vapors
Nitroethane79-24-3FF-OV9001/2/3+
7100
100 ppm (o) (t)1000 ppm
Methyl Acetate79-20-9OV7100
8100
200 ppm (o)(t);
250 ppm (s)-(t)
3100 ppm [10% Lower explosion limit]
Acrylic Acid79-10-7FFOV9001/2/3+7100ppm,(t) -skin-N.D.t-A4

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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