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  • APPENDIXF
    HAZARD RANKING

    The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

    SECTIONF101
    GENERAL

    F101.1 Scope.

    Assignment of levels of hazards to be applied to specific hazard classes as required by NFPA 704 shall be in accordance with this appendix. The appendix is based on application of the degrees of hazard as defined in NFPA 704 arranged by hazard class as for specific categories defined in Chapter 2 of the International Fire Code and used throughout.

    F101.2 General.

    The hazard rankings shown in Table F101.2 have been established by using guidelines found within NFPA 704. As noted in Section 4.2 of NFPA 704, there could be specific reasons to alter the degree of hazard assigned to a specific material; for example, ignition temperature, flammable range or susceptibility of a container to rupture by an internal combustion explosion or to metal failure while under pressure or because of heat from external fire. As a result, the degree of hazard assigned for the same material can vary when assessed by different people of equal competence.

    The hazard rankings assigned to each class represent reasonable minimum hazard levels for a given class based on the use of criteria established by NFPA 704. Specific cases of use or storage may dictate the use of higher degrees of hazard in certain cases.

    TABLE F101.2

    FIRE FIGHTER WARNING PLACARD DESIGNATIONS BASED ON HAZARD CLASSIFICATION CATEGORIES

    HAZARD CATEGORYDESIGNATION
    Combustible liquid IIF2
    Combustible liquid IIIAF2
    Combustible liquid IIIBF1
    Combustible dustF4
    Combustible fiberF3
    Cryogenic flammableF4,H3
    Cryogenic oxidizingOX, H3
    ExplosiveR4
    Flammable solidF2
    Flammable gas (gaseous)F4
    Flammable gas (liquefied)F4
    Flammable liquid IAF4
    Flammable liquid IBF3
    Flammable liquid ICF3
    Organic peroxide, UDR4
    Organic peroxide IF4, R3
    Organic peroxide IIF3, R3
    Organic peroxide IIIF2, R2
    Organic peroxide IVF1, R1
    Organic peroxide VNone
    Oxidizing gas (gaseous)OX
    Oxidizing gas (liquefied)OX
    Oxidizer 4OX4
    Oxidizer 3OX3
    Oxidizer 2OX2
    Oxidizer 1OX1
    Pyrophoric gasesF4
    Pyrophoric solids, liquidsF3
    Unstable reactive 4DR4
    Unstable reactive 3DR4
    Unstable reactive 3NR2
    Unstable reactive 2R2
    Unstable reactive 1None
    Water reactive 3W3
    Water reactive 2W2
    CorrosiveH3, COR
    ToxicH3
    Highly toxicH4
    F—Flammable category.COR—Corrosive.
    R—Reactive category.UD—Unclassified detonable material.
    H—Health category.4D—Class 4 detonable material.
    W—Special hazard: water reactive.3D—Class 3 detonable material.
    OX—Special hazard: oxidizing properties.3N—Class 3 nondetonable material.