Are workers using the right respirator and cartridge?
OSHA requires employers to provide each worker with respiratory protection when such equipment is necessary to protect the worker’s health. Employers are required by 29 CFR 1910.134 to provide respirators that are applicable and suitable for the purpose intended. The employer must also establish and maintain a respiratory protection program that identifies respiratory hazards, controls, and proper personal protective equipment selection and use.
Respirators protect workers against insufficient oxygen, harmful dusts, smoke, gases, and vapors. These hazards may cause cancer, lung diseases, or even death. Without the correct respirator and corresponding cartridge, workers are at risk of exposure.
Does the type of respirator and cartridge really matter?
Respirators protect workers in two ways — by removing contaminants from the air or by supplying clean air to the user. Particulate respirators filter out airborne particles, while air-purifying respirators (APRs) with cartridges filter out chemicals and gases. Atmosphere-supplying respirators (ASRs provide air and include airline respirators, which use compressed air from a remote source, and self-contained breathing apparatus (SCBA), which contain their own air supply.
Each type of respirator has an assigned protection factor (APF) that indicates the level of protection expected from the respirator. APRs use filters, cartridges, or canisters to remove contaminants such as dusts, gases, vapors, and aerosols from the air. The cartridges or canisters have a filter, sorbent, catalyst, or combination of these items that removes specific contaminants from air that passes through the container. Per 1910.134(d)(3)(i)(A), employers are required to assign protection factors based on Table 1 in the standard.
Both the proper type and the service life of the cartridge are paramount. Respirators and cartridges must meet or exceed the required level of worker protection. Employers must ensure APFs are appropriate to the operation or task for which respirators are used.
Types of respirator cartridges
Employers and workers should always refer to container labels and safety data sheets (SDSs to determine the proper respiratory protection for each task. NIOSH-approved respirator cartridges are designated by color coding:
- Black — used for organic vapors (OV)
- Black/magenta (black/purple) — used for OV and high efficiency (HE) filter, P100 filters
- Olive-brown — used for OV, acid gases, and ammonia
- Olive-brown/magenta (olive-brown/purple) — used for OV, ammonia, acid gases, and HE filter, P100 filters
- Magenta (purple) — used for HE filter, P100 filters
- Yellow — used for OVs and acid gases
- Yellow/magenta (yellow/purple) — used for OV, acid gases, and HE filter, P100 filters
- White — used for acid gases
- Bright green — used for ammonia
End of service life
Each respirator cartridge will have an end-of-service-life indicator (ESLI) warning the respirator user that the end of adequate respiratory protection is near. For example, the sorbent is approaching saturation or is no longer effective. Workers who use cartridges or canisters beyond the ESLI are placing themselves in harm’s way.
Keys to remember
OSHA’s Respiratory Protection standard requires employers to protect workers from insufficient oxygen, harmful dusts, smoke, gases, and vapors. Respirators and corresponding cartridges must be of proper type and condition to ensure protection appropriate to the operation or task for which they’re used.