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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
Benzyl Chloride100-44-7FF-OV/AG9001/2/3+
7300/7600
1 ppm (o)(t)10 ppmt-A3
Add particulate prefilter if particulate is present
n-Ethylmorpholine100-74-3FF-OV9001/2/3+
7100
5 ppm (t)
20 ppm (o)
-skin-
100 ppm
Sulfur Monochloride10025-67-9FF-AG9001/2/3+
7200/7300/
7600
1 ppm(c)-(t)
1 ppm (o)
5 ppm
Hydrogen Bromide10035-10-6AG7200
8200
3 ppm (o)
2 ppm (c)-(t)
30 ppm
Chlorine Dioxide10049-04-4AG7200/8200
7600/8600
0.1 ppm (t)(o);
0.3 ppm (s)-(t)
5 ppmChemical goggles required when using a half mask
4,4-Methylenedianilene101-77-9NRP1002730N100
2360P100
7940/7990
8940/7990
0.01 ppm (o);
0.1 ppm (t);
0.1 ppm (s)-(o); -skin-
Need OV/NRP100 if heat is involved. See 29 CFR 1910.1050; O-Ca; t-A3
Phenyl Ether, Vapor101-84-8OV/N7100+8910
8100+8910
1 ppm (o)(t);
2 ppm (s)(t)
100 ppm
Dicyclopentadienyl Iron102-54-5NEZ22/EZ23N95
2200/2300N95
2600/2700N95
Total dust 10mg/m3 (t),15 mg/m3 (o);
Respirable fraction 5 mg/m3 (o)
sec-Butyl Acetate105-46-4FF-OV9001/2/3+
7100
200 ppm (o)(t)1700 ppm
[10%LEL]
Add particulate prefilter if particulate is present
Caprolactam Vapor and Aerosol105-60-2OV/N7100+8910
8100+8910
5.0 mg/m3(t)*;
3.0 mg/m3 (s)-(t)
t-A5
*Measured as inhalable fraction and vapor

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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