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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
Vanadium Pentoxide Dust (as V2O5)1314-62-1
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
0.05 mg/m3 (t);
Respirable dust
0.5 mg/m3 (c)-(o)
35 mg/m3 (as Vt-A4, Substance for which an ACGIH BEI exists. ACGIH NIC to 0.05 mg/m3 measured as inhalable fraction of the aerosol and t-A3
Vanadium Pentoxide Fume (as V2O5)1314-62-1
N

2310/2315N99
2400/2800N95

0.05 mg/m3 (t);
0.1 mg/m3 (c)(o)
35 mg/m3 (as V)t-A4, Substance for which an ACGIH BEI exists. ACGIH NIC to 0.05 mg/m3 measured as inhalable fraction of the aerosol and t-A3
Welding Fumes (Not Otherwise Classified)
N

2200/2315N99
2400/2800N95
Wood Dust, Western Red Cedar
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
.5 mg/m3*
-SEN-
Inhalable fraction,
t-A4
Zirconium* compounds dusts and mists (as Zr)*7440-67-7
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
5 mg/m3 (o)(t);
10 mg/m3 (s)-(t)
{water based mists}
50 mg/m3t-A4
Grain Dust (Oat, Wheat, Barley)
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
4 mg/m3(t)*;
10 mg/m3 (o)
-SEN
*Inhalable dust
Graphite (Natural)7782-42-5
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
2.0 mg/m3 (t)* (all forms exept graphite fibers);
15MPPCF(o)
1,250 mg/m3*Respirable particulate fraction
Graphite (Synthetic) all forms except fibers)7440-44-0
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
Total dust 15 mg/m3 (o);
Respirable fraction
5 mg/m3 (o), 2.0 mg/m3 (t)*
*All forms except graphite fibers
Hafnium & Compounds, Dusts & Mists7440-58-6
N
EZ22/EZ23N95
2200/2300N95
26002700N95

0.5 mg/m3 (o)(t)
50 mg/m3 (as Hf)
Iron Salts, Soluble (as Fe)
N
EZ22/EZ23N95
2200/2300N95
2400/2800N95
1 mg/m3 (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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