Firefighters are already exposed to so much,” says chemical engineer Jeffrey Stull, “why would they want to increase exposure by wearing contaminated clothing?” The truth is sobering. Contaminated protective gear exposes firefighters to potentially life-threatening chemicals, biological agents...
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Firefighters are already exposed to so much,” says chemical engineer Jeffrey Stull, “why would they want to increase exposure by wearing contaminated clothing?” The truth is sobering. Contaminated protective gear exposes firefighters to potentially life-threatening chemicals, biological agents and particulate matter, he says. If not dealt with properly, soiled protective gear can also pass on contaminants to the public at large.
Stull, president of International Personnel Protection Inc., has authored more than 100 articles, chapters and guides on the subject. Former head of the U.S. Coast Guard’s Hazardous Chemical Personnel Protection Project, Stull assisted the National Fire Protection Agency (NFPA) with development of NFPA 1851, a standard on the selection, care and maintenance of structural fire fighting protective ensembles. He is also the lead U.S. delegate for International Standards Organization Technical Committee 94/Subcommittee 13 on Protective Clothing.
The key to limiting a firefighter’s exposure to such hazards is proper decontamination of soiled gear, which after a fire, car accident or similar event can be laden with life-threatening chemicals, blood, body fluids or particulate matter.
Today’s structural fires involve a growing diversity of chemicals produced from burned roofs, insulation, carpets and paints, according to Stull, including inorganic and organic gasses like nitrogen dioxide and benzene; acid gases such as hydrochloric acid, sulfuric acid and nitric acid; chlorinated compounds like vinyl chloride; hydrocarbons; polynuclear aromatic compounds; and metals such as cadmium and chromium. Contact with these chemicals can permeate into the fibers of protective fabrics and penetrate, or pass through fabric pores. “Chemicals that get into the clothing from either means can directly contact the wearer’s skin,” he adds.
In recent years, biological agents have become a growing concern for emergency responders, including firefighters, who come in contact with blood or body fluids. Among the most dangerous, according to Stull, are hepatitis B and C viruses and the human immunodeficiency virus (HIV) or AIDS virus. The risk is real, he maintains, since “even minute droplets of blood are capable of carrying thousands of viruses.” Most protective clothing, he warns, readily absorbs blood, particularly after it has been worn for some time.
But it’s the particulates – ash, soot and solid matter – that cause gear to appear dirty. “Soot is little pieces of carbon that adsorb, or collect in condensed form, every hazardous chemical that comes out of a fire,” says Stull. “They’re magnets for chemicals.” Potentially harmful lead dust and asbestos are other examples of particulates that can cling to gear.
And, as more and more particles attach to protective gear and chemicals remain on clothing, that gear gradually loses its effectiveness – putting firefighters at increased risk. The apparel that’s designed to protect may then facilitate a dangerous event. “Soiled gear can reflect less radiant heat, become more flammable and even conduct electricity,” maintains Stull. “Dirty gear doesn’t protect as well as clean gear.”
Every day, firefighters are faced with properly decontaminating gear, so as not to expose themselves or others. That’s why the NFPA provides a set of guidelines for cleaning protective apparel – based in part on scientific studies – including one conducted by Stull for the U.S. Fire Administration. In it, he evaluated a variety of cleaning methods and their effects on decontamination and protective apparel integrity.
“Getting the right mix of water temperature, chemicals and rinses is critical to cleaning gear and protecting it from damage,” says Stull, who recommends departments wash gear in an industrial, front-load washer-extractor with high programmability. Agitating apparel using a home-style, top-load washer “creates wear and damages clothing over the long term,” Stull warns.