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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
Cellulose9004-34-6NEZ22/EZ23N95
2200/2300N95
2600/2700N95
Total Dust 15 mg/m3 (o), 10 mg/m3 (t);
Respirable fraction 5 mg/m3 (o)
o-sec-Butyl-Phenol89-72-5OVRP7100+8970+7940
8100+8970+8940
5 ppm (t); -skin-
Picric Acid88-89-1NEZ22/EZ23N95
2200/2300N95
2600/2700N95
0.1 mg/m3 (o)(t); -skin-75 mg/m
Pentachlorophenol87-86-5OV/N7100+8910
8100+8910
0.5 mg/m3 (o)(t); -skin-2.5 mg/m3Substance for which an ACGIH BEI exists
t-A3
ANTU86-88-4OV/NRP1007100+7940
8100+8940
0.3mg/m3 (o)(t)100mg/m3t-A4
Azinphos-methyl86-50-0OVRP8100+8970/8940
7100+8970/7940
0.2mg/m3 (o)(t); -*skin-
-SEN-
10mg/m3Substance for which an ACGIH BEI exists, t-A4; *measured as inhalable fraction and vapor
Phthalic Anhydride85-44-9OV/N7100+8910
8100+8910
1 ppm (t)
2ppm (o)
10 ppmt-A4; SEN
Dibutyl Phthalate84-74-2OV/RP7100+8970/7940
8100+8970/8940
5 mg/m3 (o)(t)4,000 mg/m3
Diethyl Phthalate84-66-2RP2740R95/8970
7940/7990
8940/8990
5 mg/m3 (t)t-A4
Rotenone83-79-4OV/NRP1007100+7940
8100+8940
5 mg/m3 (o)(t)2,500 mg/m3t-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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