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Regarding Hazardous Materials in the Fire Service Act

Regarding hazardous materials in the Japanese Fire Service Act

Fire Service Act

Among substances which present a hazard, the Japanese Fire Service Act designates items in Appended Table given in the law, and "hazardous materials" means the substances listed in the Item column of said table, which have the properties listed in the Nature column of said table according to the Categories specified in said table, and safety regulation is carried out from the perspective of fire prevention regarding hazardous material storage and handling, etc.

Hazardous materials in the Japanese Fire Service Act

Hazardous materials in the Japanese Fire Service Act are classified into six categories, from Category I to Category VI, based on their chemical and physical properties, and furthermore, Relevant items have been designated for each category.
Note: This may not be the latest information, depending on the timing of updates in the posted information. (Current as of April 1, 2017)

Hazardous material categories

Category Nature Overview of properties Item (including items specified by Cabinet Order)
Category I Oxidizing solids Solids having the property of oxidizing other substances, and resulting in intense combustion due to thermal decomposition, etc. in contact with combustibles.
  1. chlorates
  2. perchlorates
  3. inorganic peroxides
  4. chlorites
  5. bromates
  6. nitrates
  7. iodates
  8. permanganates
  9. dichromates
  10. Other substances specified by a Cabinet Order (i.e., periodates, periodic acid, chromium oxides, lead oxides, iodine oxides, nitrites, hypochlorites, chlorinated isocyanuric acid, peroxodisulfate, peroxoborate and sodium carbonate peroxyhydrate)
  11. Substances containing any of those listed in the preceding items
Category II Combustible solids Solids that can be easily ignited by flame or at relatively low temperature (below 40 degC) 
  1. phosphorus sulfides
  2. red phosphorus
  3. sulfur
  4. iron powder
  5. metal powder
  6. magnesium
  7. Other substances specified by a Cabinet Order
  8. Substances containing any of those listed in the preceding items
  9. inflammable solids
Category III Spontaneously combustible substances and water-reactive substances
Solid or liquid
Substances that pose a hazard of spontaneous ignition when exposed to air, or substances that ignite or produce flammable gases in contact with water
  1. potassium
  2. sodium
  3. alkyl aluminum
  4. alkyl lithium
  5. yellow phosphorus
  6. alkali metal (excluding potassium and sodium) and alkaline earth metal
  7. organometallic compounds (excluding alkyl aluminum and alkyl lithium)
  8. metal hydrides
  9. metal phosphides
  10. calcium carbide or aluminum carbide
  11. Other substances specified by a Cabinet Order (i.e., silicon chloride)
  12. Substances containing any of those listed in the preceding items
Category IV Inflammable liquids Liquids with inflammability
(Including Class III petroleums, Class IV petroleums, and oils extracted from animals and plants are limited to those forming  liquids at 1 atm and 20 degC)
  1. special flammable materials
  2. Class I petroleums
  3. alcohols
  4. Class II petroleums
  5. Class III petroleums
  6. Class IV petroleums
  7. oils extracted from animals and plants
Category V Self-reactive substances
Solids or liquids
Substances which generate large amounts of heat or react explosively at relatively low temperature due to self-reaction such as thermal decomposition.
  1. organic peroxides
  2. nitric esters
  3. nitro compounds
  4. nitroso compounds
  5. azo compounds
  6. diazo compounds
  7. hydrazine derivatives
  8. hydroxylamine
  9. hydroylamine salts
  10. Other substances specified by a Cabinet Order (i.e., metal azides, guanidine nitrate, 1-allyloxy-2,3-epoxypropane and 4-methylidenoxetan-2-one)
  11. Substances containing any of those listed in the preceding items
Category VI Oxidizing liquids Liquids which themselves do not combust, but have the property of promoting combustion of other flammable substances when mixed with them
  1. perchloric acid
  2. hydrogen peroxide
  3. nitric acid
  4. Other substances specified by a Cabinet Order (i.e. interhalogen compounds)
  5. Those containing any of those listed in the preceding items
Designated flammable goods   Straw products, wood-wool and other goods specified by a Cabinet Order as goods which will, once having caught fire, lead to the quick spread of the fire or make it extremely difficult to carry out fire extinguishing activities
  • raw cotton
  • wood wool and wood shavings
  • rags and waste paper
  • yarn
  • straw
  • recycled resource fuels
  • inflammable solids
  • coal and charcoal
  • inflammable liquids
  • wood processing products and waste wood
  • synthetic resins, foamed
  • synthetic resins, others

Order of precedence of hazardous materials which fall under two or more Categories

  Category I Category II Category III Category IV Category V
Category I   Category II     Category V
Category II Category II   Category III    
Category III   Category III   Category III  
Category IV     Category III   Category V
Category V Category V     Category V  

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