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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
n-Propyl Acetate109-60-4FF-OV9001/2/3+
7100
200 ppm (o)(t)
250 ppm (s)-(t)
1700 ppm
n-Propyl Alcohol71-223-8FF-OV9001/2/3+
7100
100 ppm (t)
200 ppm (o)
800 ppmAdd particulate prefilter if particulate is present
t-A4
Bromoform75-25-2FF-OV9001/2/3+
7100
0.5 ppm (o)(t)
-skin-
850 ppmt-A3
Nitroethane79-24-3FF-OV9001/2/3+
7100
100 ppm (o) (t)1000 ppm
Butylglycol111-76-2FF-OV9001/2/3+
7100
50 ppm (o)
20 ppm (t)
-skin-
700 ppmSubstance for which ACGIH BEI exists
Add particulate prefilter if particulate is present
n-Butyl Acetate123-86-4FF-OV9001/2/3+
7100
150 ppm (o)(t)
200 ppm (s)-(t)
1700 ppm
[10%LEL]
Add particulate prefilter if particulate is present
sec-Butyl Acetate105-46-4FF-OV9001/2/3+
7100
200 ppm (o)(t)1700 ppm
[10%LEL]
Add particulate prefilter if particulate is present
tert-Butyl Acetate540-88-5FF-OV9001/2/3+
7100
200 ppm (o)(t)1500 ppm
[10%LEL]
n-Butyl Alcohol71-36-3FF-OV9001/2/3+
7100
20 ppm (o)
100 ppm (t)
1400 ppm
[10%LEL]
sec-Butyl Alcohol78-92-2FF-OV9001/2/3+
7100
150 ppm (o)
100 ppm (t)
2000 ppm

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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