"The Department of Homeland Security, Science & Technology Directorate, Acquisition Support & Operations Analysis, Office of Standards identified a critical flaw in first responder Self-Contained Breathing Apparatus (SCBA) facemask facepiece lenses. S&T funded 'live burn' studies and laboratory tests conducted by the National Institute of Standards and Technology (NIST). Studies found that firefighter's SCBA facepiece lenses may melt when exposed to intense heat. The identification of this flaw resulted in the National Fire Protection Association (NFPA) issuing a safety alert to 1.25 million U.S. firefighters in July 2012, recommending all SCBA facepiece lenses be inspected before and after each use. As a result, NFPA's safety alerts based on S&T studies protect frontline responders from critical injury or death."
U.S. Department of Homeland Security: https://www.dhs.gov/