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HAZMAT Terms

HAZMAT Zones. . . . . Hot ZoneContamination PresentAppropriate PPELimited number of personnelEverything inside considered contaminated. Warm ZoneContamination Control ZoneAppropriate PPEDecon CorridorLife-Saving Emergency Care. Cold ZoneCP LocationTreatment/Transport AreasStagingMedical

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HAZMAT Terms

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    1. HAZMAT Terms

    2. HAZMAT Zones

    3. Boiling Point Temperature at which a liquid becomes a gas More technically, temperature at which a substance’s vapor pressure equals atmospheric pressure

    4. Flammable/Explosive Limits Lower Explosive Limit = Lowest concentration of chemical that burns in air Upper Explosive Limit = Highest concentration of chemical that burns in air

    5. Flash Point Lowest temperature at which a liquid will give off enough vapors to ignite

    6. Ignition Temperature Lowest temperature at which a liquid will give off enough vapors to support ongoing combustion Slightly higher than flash point

    7. Specific Gravity Density of a liquid compared to water (water = 1) Specific gravity >1 = Liquid sinks in water Specific gravity <1 = Liquid floats on water

    8. Vapor Density Density of a vapor or gas compared to air (air = 1) Vapor Density >1 = Gas sinks Vapor Density <1 = Gas rises

    9. Vapor Pressure Pressure of vapor against container walls Indicates how fast a liquid evaporates Higher vapor pressures = Rapid evaporation

    10. Parts per million/Parts per billion ppm ppb Concentration of substance expressed in number of units of substance per 106 or 109 units of air or solution

    11. Threshold Limit Value/ Time Weighted Average TLV/TWA Maximum concentration of toxin a person can be exposed to 8 hours a day, 40 hours per week without suffering adverse effects Lower TLV/TWA = Higher toxicity

    12. Threshold Limit Value/ Short-Term Exposure Limit TLV/STEL Maximum concentration of toxin a person can be exposed to for 15 minutes without suffering adverse effects Not to be exceeded or repeated >4x daily with 60 minute rests between each exposure

    13. Threshold Limit Value/Ceiling Level TLV/CL Maximum concentration of a toxin that should NEVER be exceeded, even for a moment

    14. Lethal Concentration/Lethal Dose Concentration or dose of toxin that results in death of a defined % of test subjects LCt50 = Concentration in air that kills 50% of test subjects LD50 = Ingested, injected, absorbed dose that kills 50% of test subjects

    15. Immediately Dangerous to Life and Health IDLH Concentration of toxin that causes immediate threat to life May cause delayed or irreversible effects May interfere with person’s ability to self-rescue

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