Appendix H. Hazardous Materials Classification and Permit Amounts The most widely used detailed classification scheme is the one that has been developed by the National Fire Protection Association, and is presented in the 1991 Uniform Fire Code, among other documents. This classification scheme is shown in Table H1. Sixty material types have been defined (HM01 to HM60). The hazards posed by the various materials are divided into two major categories: Physical Hazards and Health Hazards. Depending upon the exact nature of the hazard, these two major categories are divided into subcategories. Examples are poison, carcinogen, mildly toxic, moderately toxic or skin irritant. These subcategories of hazards, with their definitions, and examples of materials that fall within each category, are contained in Appendix 11A and 11B of the Technical Manual. A more detailed description of these categories, with more extensive examples can be found in Appendix VI-A of the 1991 Uniform Fire Code. Table H1 also contains minimum quantities of the materials that must be on site to require permitting according to the Uniform Fire Code. It should be noted that the minimum permit quantities may vary depending upon whether the chemical is stored inside or outside of a building. For facilities that have hazardous materials, but in quantities less than those listed in Table H1, it is anticipated that releases of these small quantities will not put significant immediate demands on health and emergency services, thus you may wish to exclude them from the database. Hazus-MH User’s Manual Table H1 Classification of Hazardous Materials and Permit Amounts Label Material Type Permit Amount Hazard Type Remarks Inside Building Outside Building HM01 Carcinogens 10 lbs 10 lbs Health HM02 Cellulose nitrate 25 lbs 25 lbs Physical HM03 Combustible fibers 100 cubic ft 100 cubic ft Physical HM04 HM05 HM06 Combustible liquids Class I Class II Class III-A 5 gallons 25 gallons 25 gallons 10 gallons 60 gallons 60 gallons Physical HM07 Corrosive gases Any amount Any amount Health [1] HM08 Corrosive liquids 55 gallons 55 gallons Physical; Health HM09 HM10 HM11 HM12 HM13 Cryogens Corrosive Flammable Highly toxic Nonflammable Oxidizer (including oxygen) 1 gallon 1 gallon 1 gallon 60 gallons 50 gallons 1 gallon 60 gallons 1 gallon 500 gallons 50 gallons Health Physical Health Physical Physical HM14 Highly toxic gases Any amount Any amount Health; [1] HM15 Highly toxic liquids & solids Any amount Any amount Health HM16 Inert 6,000 cubic ft 6,000 cubic ft Physical; [1] HM17 Irritant liquids 55 gallons 55 gallons Health HM18 Irritant solids 500 lbs 500 lbs Health HM19 Liquefied petroleum gases > 125 gallons > 125 gallons Physical HM20 Magnesium 10 lbs 10 lbs Physical HM21 Nitrate film (Unclear) (Unclear) Health HM22 Oxidizing gases (including oxygen) 500 cubic feet 500 cubic feet Physical [1] HM23 HM24 HM25 HM26 Oxidizing liquids Class 4 Class 3 Class 2 Class 1 Any amount 1 gallon 10 gallons 55 gallons Any amount 1 gallon 10 gallons 55 gallons Physical HM27 HM28 HM29 HM30 Oxidizing solids Class 4 Class 3 Class 2 Class 1 Any amount 10 lbs 100 lbs 500 lbs Any amount 10 lbs 100 lbs 500 lbs Physical HM31 HM32 HM33 HM34 Organic peroxide liquids and solids Class I Class II Class III Class IV Any amount Any amount 10 lbs 20 lbs Any amount Any amount 10 lbs 20 lbs Physical HM35 HM36 Other health hazards Liquids Solids 55 gallons 500 lbs 55 gallons 500 lbs Health HM37 Pyrophoric gases Any amount Any amount Physical [1] HM38 Pyrophoric liquids Any amount Any amount Physical Appendix H. Hazardous Materials Classification and Permit Amounts HM39 Pyrophoric solids Any amount Any amount Physical HM40 Radioactive materials 1 m Curie in unsealed source 1 m Curie in sealed source Health [1] HM41 Sensitizer, liquids 55 gallons 55 gallons Health HM42 Sensitizer, solids 500 lbs 500 lbs Health HM43 Toxic gases Any amount Any amount Health [1] Table H1 Classification of Hazardous Materials and Permit Amounts (Cont.) Label Material Type Permit Amount Hazard Type Remarks Inside Building Outside Building HM44 Toxic liquids 50 gallons 50 gallons Health HM45 Toxic solids 500 lbs 500 lbs Health HM46 Unstable gases (reactive) Any amount Any amount Physical1 Unstable liquids (reactive) Physical HM47 Class 4 Any amount Any amount HM48 Class 3 Any amount Any amount HM49 Class 2 5 gallons 5 gallons HM50 Class 1 10 gallons 10 gallons Unstable solids (reactive) Physical HM51 Class 4 Any amount Any amount HM52 Class 3 Any amount Any amount HM53 Class 2 50 lbs 50 lbs HM54 Class 1 100 lbs 100 lbs Water-reactive liquids Physical HM55 Class 3 Any amount Any amount HM56 Class 2 5 gallons 5 gallons HM57 Class 1 10 gallons 10 gallons Water-reactive solids Physical HM58 Class 3 Any amount Any amount HM59 Class 2 50 pounds 50 pounds HM60 Class 1 100 pounds 100 pounds 1 Includes compressed gases Hazus-MH User’s Manual