Our premium-quality disposable UNIAIR 9550 N95 face masks and NIOSH certified (National Institute for Occupational Safety and Health). Our NIOSH approved UNIAIR 9550 N95 face masks filter at least 95% airborne particles that are non-oil based. Our disposable UNIAIR 9550 N95 masks, are lightweight in construction to promote greater worker acceptance and helps increase wear time. Our N95 masks are made of several layers of special non-woven polypropylene (synthetic polymer) fabric. This fabric is produced by melt blowing and forms the inner filtration layer in the N95 mask that filters out hazardous particles.