What type of respirator should be worn when applying polyurethane?

• A. PAPR
• B. NIOSH disposable
• C. Half-face respirator
• D. Airline respirator

Answer: (D)

Applying polyurethane releases isocyanate vapors and spray mist that can irritate the lungs and eyes and can cause sensitization with repeated exposure. To protect yourself during spray applications, you need a respirator that delivers clean air from a non-contaminated source—the airline (supplied-air) respirator. It feeds breathable air through a hose from a compressor or tank, so you’re not inhaling the potentially polluted room air and you also get reliable protection for the eyes and face with a full-facepiece.

Other options aren’t as protective in this scenario: cartridges and disposable masks can saturate or fail to filter isocyanates adequately, and a half-face respirator typically doesn’t provide the necessary seal or eye protection for spray operations. A PAPR can offer protection, but for the high exposure levels encountered with spraying polyurethane, a continuous clean air supply from an airline respirator is the safer, more dependable choice.