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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
Silica-Amorphous, Precipitated Silica and Silica Gel*112926-00-8
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
20 mppcf (o) or
80 mg/m3 (o)
---------------
%SiO2
3000 mg/m3
Silica-Amorphous, Silica-Fused60676-86-0
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
30 mg/m3 (o)**
-------------------
%SiO2 +2
or 250 mppcf (o)*
---------------------
%SiO2+5
or 10 mg/m3 (o)*
--------------------
%SiO2+2
3000 mg/m3**Total dust
*Respirable dust
Silica-Crystalline; Quartz**14808-60-7
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
0.25 mg/m3 (t)* quartz
10 mg/m3 (o)*
-----------------
%SiO2+2
or 250 mppcf (o)*
---------------------
%SiO2+5
or 30 mg (o)/m3**
----------------------
%SiO2+2
50 mg/m3
(Crystalline quartz)
t-A2
*Respirable dust
**Total dust
Silica-Crystalline; Tripoli1317-95-9
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
(o) use the value
calculated from the
formulas for quartz
50 mg/m3
Silica-Crystalline (Cristobalite* & Tridymite?)*14464-46-1, ?15468-32-3
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
(Cristobalite only)
0.025 mg/m3 (t)
(Respirable);
(o)respirable fraction use
1?2 the value calculated
from the formulas (applies to
quartz for cristabolite & tridymite.)
25 mg/m3t-A2
Silicon7440-21-3
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
15 mg/m3 (o); total dust
Respirable fraction 5 mg/m3 (o)
Silicon Carbide409-21-2
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
15 mg/m3 (o);
Respirable fraction
5 mg/m3 (o)
t-A4
Soapstone
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
Total dust
20 mppcf (o);
Respirable fraction
3 mg/m3 (t)
6 mg/m3 (t) inhalable
3,000 mg/m3Total dust containingno Asbestos and <1% Crystalline Silica
Starch9005-25-8
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
Total dust 10 mg/m3(t),
15 mg/m3 (o);
Respirable fraction
5 mg/m3 (o)
t-A4
Sucrose57-50-1
N
EZ22/EZ23N95
2200/2300N95
2600/2700N95
Total dust 10 mg/m3(t),
15 mg/m3 (o);
Respirable fraction
5 mg/m3 (o)
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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