Personal Protective Equipment and Respiratory Protection
Respirator selection
Respiratory protection is the last line of defense but is exam-critical. OSHA’s asbestos standard ties the minimum respirator to measured or expected exposure: half-mask APR with HEPA filters at low levels; full-facepiece APR at higher levels; powered air-purifying respirator (PAPR) for still higher; pressure-demand SCBA for >10 f/cc or unknown concentrations. All respirators require medical evaluation, fit testing, and training.
Other PPE
- Disposable coveralls (often double-suited), hood, boot covers, gloves, and eye protection.
- No street clothing exposed; remove PPE in the dirty room, not outside.
- Fit test annually; user seal check each donning.
- Eyewear must not break the respirator seal.
Worked example
A personal sample from a worker removing boiler insulation shows 4.5 f/cc 8-hour TWA. A half-mask APR is not enough; use at least a full-facepiece APR with HEPA cartridges. If the concentration were 12 f/cc, or unknown in a grossly contaminated space, use pressure-demand SCBA. The supervisor must verify fit and medical clearance before entry.
Traps
Do not select a dust mask or surgical mask; do not assume a PAPR is approved for all asbestos exposures; do not let a beard pass a fit test. Do not remove the respirator in the clean room before showering and changing.