International Fire Code 2018 (IFC 2018)

Part I — Administrative

Part II — General Safety Provisions

Part III — Building and Equipment Design Features

Part IV — Special Occupancies and Operations

Part V — Hazardous Materials

Part VI — Referenced Standards

Part VII — Appendices

Heads up: There are no suggested sections in this chapter.
Heads up: There are no amended sections in this chapter.
The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance or legislation of the jurisdiction.
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.

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

Combustible liquid II F2
Combustible liquid IIIA F2
Combustible liquid IIIB F1
Combustible dust F3 or F2a
Combustible fiber F3
Cryogenic flammable F4, H3
Cryogenic oxidizing OX, H3
Explosive R4
Flammable solid F2
Flammable gas (gaseous) F4
Flammable gas (liquefied) F4
Flammable liquid IA F4
Flammable liquid IB F3
Flammable liquid IC F3
Organic peroxide UD R4
Organic peroxide I F4, R3
Organic peroxide II F3, R3
Organic peroxide III F2, R2
Organic peroxide IV F1, R1
Organic peroxide V None
Oxidizing gas (gaseous) OX
Oxidizing gas (liquefied) OX
Oxidizer 4 OX4
Oxidizer 3 OX3
Oxidizer 2 OX2
Oxidizer 1 OX1
Pyrophoric gases F4
Pyrophoric solids, liquids F3
Unstable reactive 4D R4
Unstable reactive 3D R4
Unstable reactive 3N R2
Unstable reactive 2 R2
Unstable reactive 1 None
Water reactive 3 W3
Water reactive 2 W2
Corrosive H3, COR
Toxic H3
Highly toxic H4
  1. F3 = Finely divided solids, typically less than 75 micrometers (µm) (200 mesh), that pose an elevated risk of forming an ignitable dust cloud, such as finely divided sulfur, National Electric Code Group E dusts (for example, aluminum, zirconium and titanium) and bisphenol A. F2 = Finely divided solids less than 420 µm (40 mesh) that pose an ordinary risk of forming an ignitable dust cloud.
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.
NFPA 704—17Identification of the Hazards of Materials for Emergency ResponseF101.1, F101.2
Analyzing code differences
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