3M Masks and Respirators - Using a variety of patented technologies and features that enable them to filter a broad range of particles, these 3M disposable masks are NIOSH certified to have a filter efficiency of 95% or greater against particulates free of oil. The patented filter media uses advanced electrostatically charged micro fibers to help make breathing easier and cooler for advanced comfort. These 3M masks are lightweight for more comfort and increased wear time on the job.