Note: With relation to analogous chemical
structures (chemical families), employers can rely on service life
values from other chemicals having a similar chemical structure to the
contaminant under evaluation (test chemical) for breakthrough.
(From OSHA Directive CPL 2-0.120 (Inspection Procedures for the
Respiratory Protection Standard) APPENDIX
A: CHANGE SCHEDULES GUIDE -- A LISTING OF METHODS
--9-25-98)
| Chemical Family |
Test Chemical |
| Acid Gases | Chlorine Hydrogen Chloride Hydrogen Sulfide Sulfur Dioxide |
| Aldehydes | Valeraldehyde Formaldehyde |
| Aliphatic Primary Alcohols | 1-Propanol |
| Aliphatic Secondary Alcohols | 2-Propanol |
| Amines | Methyl Amine |
| Ammonia | Ammonia |
| Aromatic Hydrocarbons | Toluene |
| Chlorinated Hydrocarbons | 1,2 Dichloroethylene |
| Cyclic Ethers | Tetrahydrofuran |
| Cyclic Saturated Hydrocarbons | Cyclohexane |
| Esters | Isopropyl Acetate |
| Ether Alcohols | 2-Methoxyethanol |
| Ethers | Methyl Tertiary-Butyl Ether (MTBE) |
| Ketones | Methyl Ethyl Ketone (MEK) |
| Saturated Aliphatic Hydrocarbons | Hexane |
| Unsaturated Hydrocarbons | Hexene |
Do not use the data presented in this study as the sole factor in determining the respirator cartridge change-out schedule. An appropriate change-out schedule must be developed by a knowledgeable professional. It should be based on additional factors including the actual workplace conditions, work practices and other conditions which may affect respiratory protection. Failure to determine an appropriate change-out schedule can cause overexposure and result in serious personal injury or death.