Table I-3. Class of Flammable and Combustible Liquids Flash Boiling Examples point point Acetaldehyde, Ethyl ether, Gasoline, Class IA < 73ºF < 100ºF Methyl formate, Pentane Acetone, Benzene, Flammable liquids Carbon disulfide, Class IB < 73ºF 100ºF ≥ Cyclohexane, Ethanol, (Class I liquids) Methyl alcohol, Toluene Amylacetate, 73ºF but ≥ Not Butyl alcohol, Hydrazine, Class IC Applicable < 100ºF Styrene, Xylene Acetic acid, Formaldehyde, 100ºF but ≥ Not Glacial acetic acid, Class II Applicable < Hydrazine, Naphtha, Stoddard solvent Combustible Cyclohexanol, liquids Formic acid, 140ºF but ≥ Not (Class II & III Naphthalene, Class IIIA Applicable < 200ºF liquids) Nitrobenzene, Octyl alcohol Formalin, Glycerine, Not Picric acid, Class IIIB 200ºF ≥ Applicable Propylene glycol General Rule of Hazard Classes Some hazard classes are assigned numerical designations based upon their hazard potential. For example, oxidizers and unstable (reactive) materials are classified as Class 1, 2, 3 or 4 materials; water solids and liquids are classified as Class 1, –reactive 2 or 3 materials; and organic peroxides are classified as Class I, II, III IV or V materials. The following chart explains the severity of each class: Arabic Numeral Roman Numeral 4 HIGHEST HAZARD I 3 II 2 III 1 IV 0 LOWEST HAZARD V
Table I-3. Class of Flammable and Combustible Liquids Flash point Boiling point Examples Class IA < 73ºF < 100ºF Acetaldehyde, Ethyl ether, Gasoline, Methyl formate, Pentane Flammable liquids (Class I liquids) Class IB < 73ºF ≥ 100ºF Acetone, Benzene, Carbon disulfide, Cyclohexane, Ethanol, Methyl alcohol, Toluene Class IC ≥ 73ºF but < 100ºF Not Applicable Amylacetate, Butyl alcohol, Hydrazine, Styrene, Xylene Class II ≥ 100ºF but < Not Applicable Acetic acid, Formaldehyde, Glacial acetic acid, Hydrazine, Naphtha, Stoddard solvent Combustible liquids (Class II & III liquids) Class IIIA ≥ 140ºF but < 200ºF Not Applicable Cyclohexanol, Formic acid, Naphthalene, Nitrobenzene, Octyl alcohol Class IIIB ≥ 200ºF Not Applicable Formalin, Glycerine, Picric acid, Propylene glycol General Rule of Hazard Classes Some hazard classes are assigned numerical designations based upon their hazard potential. For example, oxidizers and unstable (reactive) materials are classified as Class 1, 2, 3 or 4 materials; water –reactive solids and liquids are classified as Class 1, 2 or 3 materials; and organic peroxides are classified as Class I, II, III IV or V materials. The following chart explains the severity of each class: Arabic Numeral Roman Numeral 4 HIGHEST HAZARD I 3 II 2 III 1 IV 0 LOWEST HAZARD V
COF%20Study%20Materials.docx