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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
Propionic Acid79-09-4FF-OV9001/2/3+
7100
10 ppm (t)N.D.
Acrylamide79-06-1OV/P1007100+7940
8100+8940
.03mg/m3 (t)*;
.3mg/m3 (o)
-skin-
60mg/m3t-A3; -*Measured as inhalable fraction and vapor
Trichloroethylene79-01-6OV7100
8100
10ppm (t); 100ppm (o);
200ppm (c)-(o)
[300 ppm 5 min
peak in any 2 hrs]
25ppm (c)-(t)
1000ppmsubstance for which an ACGIH BEI exists
t-A2
sec-Butyl Alcohol78-92-2FF-OV9001/2/3+
7100
150 ppm (o)
100 ppm (t)
2000 ppm
Propylene Dichloride78-87-5OV7100
8100
10 ppm (t);
75ppm (0)
400 ppm
-SEN
t-A4
Isobutyl Alcohol78-83-1FF-OV9001/2/3+
7100
50 ppm (t)
100 ppm (o)
1600 ppm
Isophorone78-59-1OV7100
8100
25 ppm (o);
5 ppm (c)-(t)
200 ppmAdd 8910 if particulate is present; A-3
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)
Ethyl Silicate78-10-4OV7100
8100
10 ppm (t)
100 ppm (o)
700 ppm
Hydrogen Sulfide7783-06-4AG7200
8200
1 ppm (t);
5 ppm (s)-(t);
20 ppm (c)-(o);
[50 ppm 10 min peak /
8 hr shift]
100 ppmEscape only; Poor warning; Olfactory fatigue;
(t)

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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