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i Incompatibles NFPA Diamond • Chemicals pose hazards on their own but they also may The NFPA(National Fire Protection pose additional hazards when they combine with other Association)Diamond is a symbol chemicals. system used to indicate the hazards • Violent reactions occur when the fallowing hazards classes associated with the hazardous are mixed together: materials stored in a fixed facility. —Corrosives+Flammables=Explosion/Fire —Many cities have codified this i t. —Corrosives+Poisons=Poison Gas recommendation into law —Flammabies+Oxidizers=Explosion/Fire —It is used to assist fire-fighters in —Acids+Bases=Corrosive Fumes/Heat determining appropriate actions during r a fire Ehvirpsaieiech i NFPA Diamond NFPA Diamond • The diamond is divided into four smaller The numbers are read from left to right starting with the diamonds representing a type of hazard: — Fire Hazards(Redl health rating,then fire and finally reactivity. —Specific H zard ((Yellow! —Example 2-4-3 Water Reactive is how the NFPA Diamond below is Specific Hazards(White) 41 R.. read Health Hazards(Blue) —This on be remembered as FRaSH Bps" • The numbering system indicates the five degrees of hazard. • Ratings range from 0 to 4,with 4 indicating the highest hazard level in each category, • Example:4 in the five hazards section means iR• � extremely flammable whereas,3 is flammable,21s combustible,and 0 will not burn. Vapor Pressure Vapor Pressure Vapor Pressure(VP)is the pressure placed on the inside • Chemicals with a high VP result in a larger hot zone(exclusion zone) of a closed container by the vapor in the space above as compared to chemicals with a low VP which do not evaporate the liquid that the container holds, easily. • Chemicals with high vapor pressures are more likely to • Chemicals with a high VP compared to a similar chemical will reach its breach their containers when heated,since pressure Lower Explosive Limit(LEL)sooner. increases as the temperature rises, • Chemicals with high vapor pressure are usually easier to detect • Chemicals with high vapor pressures are volatile;more because they become airborne. vapors will be present in contaminated areas as well as • The units of vapor pressure most often used are in millimeters of mercury(mm Hg),the larger the number,the higher the vapor when containers,are opened. i `,• pressure. { t-•,+ —The chemical's VP is usually compared to the VP of n•Butyl Acetate which Itself ? � has a high vapor pressure 6