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fire retardant
A fire retardant is a substance that reduces flammability of fuels or delays their combustion.〔(Coford Glossary "Fire Retardant" )〕 This includes chemical agents, but may also include substances that work by physical action, such as cooling the fuels, such as fire-fighting foams and fire-retardant gels. Fire retardants may also be coatings applied to an object,〔(【引用サイトリンク】title=Zinsser Glossary )〕 such as a spray retardant to prevent Christmas trees from burning. Fire retardants are commonly used in fire fighting.
Home fires damage about 400,000 homes, and cause approximately 7 billion US dollars in direct damage annually in the United States.〔(【引用サイトリンク】title=U.S. home structure fires )〕 Because of the importance of prevention, fire retardation has become a very notable industry.
==How retardants work==
In general, fire retardants reduce the flammability of materials by either blocking the fire physically or by initiating a chemical reaction that stops the fire.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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