What substance is often used to check the fit of cartridge respirators?

The use of isoamyl acetate to check the fit of cartridge respirators is significant because it is a well-known qualitative fit test agent. When conducting a fit test, isoamyl acetate is employed to verify that the respirator creates a proper seal around the user's face. This testing is critical in ensuring that the respirator effectively prevents airborne contaminants from entering.

Isoamyl acetate has a distinct smell that can be easily detected, which allows the wearer to confirm whether the respirator is functioning correctly. If the individual can smell the substance while wearing the respirator, it indicates that there is a leak in the seal, suggesting a poor fit.

Other substances listed, while possibly having odor characteristics, are not typically employed for this specific purpose. This makes isoamyl acetate the preferred choice for fitting tests to ensure safety and effectiveness in wearing cartridge respirators.