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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
Hydrogen Fluoride (as F)7664-39-3FF-AG9001/2/3+
7200/7300/
7600
0.5 ppm (t)*
2 ppm (c)-(t)*
3 ppm (o)*+
*as F, +15 min
-skin-
30 ppmSubstance for which ACGIH BEI exists
Chlorine7782-50-5AG7200/8200
7300/8300
7600/8600
0.5 ppm (t);
1 ppm (c)(s)-(o)(t)
10 ppmChemical goggles required when using a half mask, t-A43
Ethyl Mercaptan75-08-1OV7100
8100
0.5 ppm (t);
10 ppm (c)-(o)
500 ppm
Methyl Mercaptan74-93-1OV7100
8100
0.5 ppm (t);
10 ppm (c)-(o)
150 ppmVery short service life
Antimony* & Compounds (as Sb), Dusts & Mists*7440-36-0
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
0.5mg/m3 (o)(t)
{water based mists}
50mg/m3 (as Sb)
Anisidine (o-,p-Isomers)o 90-04-0 p 104-94-9OV/RP
OV/N
7100+7940*
7100+8970*
7100+8990?
8100+8970/8940*
8100+8910?
0.5mg/m3 (o)(t);
-skin-
50mg/m3t-A3 for o Isomer
t-A4 for p Isomer
Asphalt (petroleum; Bitumen) Fume8052-42-4OVRP8100+8970/8940
7100+8970/7940
0.5mg/m3 (t)*
Soluble aerosol as benzene (or equivalent method) inhalable particulate
2740R95/2840R95 may be suitable for some app’s. t-A4
Chromium, Metal (as Cr)7440-47-3NEZ22/EZ23N95
2200/2300N95
2600/2700N95
0.5mg/m3 (t);
1mg/m3 (o)
250mg/m3For specific information, refer to:
NIOSH Pocket Guide to Chemical Hazards;
t-A4
Formaldehyde50-00-0FORM7500/7600
8500/8600
0.75 ppm (o);
0.3 ppm (c)-(t);
2 ppm (s)-(o)
20 ppmSee 29CFR1910.1048; O-Ca; t-A2; Dispose of cartridges at the end of each work shift; wear gas-proof goggles with half-mask. Do not use same cartridge for any other gases or vapors; SEN
Fibrous Glass Dust, Glass Fibers, Glass Wool, Rock Wool, Slag Wool, Continuous Filament Glass Fibers**N95EZ22/EZ23N95
2200/2300N95
2600/2700N95
1 f/cc (t)*;
Total 15 mg/m3 (o);
respirable fraction
5 mg/m3 (o);
**5mg/m3 (measured as inhalable fraction)
*(t)-A3
Respirable fiber longer than 5 u; diameter; aspect ratio >3:1 as det. by mem. Filt. meth 400-450 X mag (4mm obj.) phas. cont.illum.
**(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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