Chemical Hazards

Classes of Chemical Hazards

  • Fuming Acids
  • Non-Fuming Acids
  • Crystalline Acids
  • Alkaline Materials
  • Caustic Materials
  • Salts


  • Type 1 – High – Mass explosion hazard: TNT/Ammo/Fire wks
  • Type 2 – Low Order: Fireworks/C-4/Blasting caps
  • Shock Sensitive: Nitroglycerin
  • Chemicals or Combinations
  • Metal Dusts

Flammable/Combustible Liquids

  • A flammable liquid (29 CFR 1910.106(a)(19)) has a flash point (CC test) below 100ºF (37.8ºC). Gases can travel considerable distances to a source of ignition and flash back to the flammable liquid.
  • A Combustible Liquid: A combustible liquid (29 CFR 1910.106(a)(19)) has a flash point at or above 100ºF (37.8ºC), but below 200ºF (93.3ºC).

Explosive Range

  • LEL and UEL
  • Too rich or too lean

Gases, Flammable, Toxic

  • Asphyxiants: C02; He; N2 CH4(Methane)
  • Propane (LPG).
  • Toxic Gases: H2S; CO

Flammable Solids: Matches: Self-heating materials, those that exhibit spontaneous ignition or heat themselves to a temperature of 200 deg.C (392 deg.F) during a 24-hour test period. (This behavior is called spontaneous combustion

Reactive Chemicals

  • Water Reactive
  • Exothermic/Endothermic
  • Metal Hydrides, Hydro: gas reacts with metal
  • Air Reactive (Pyrophoric) – 5 min. exposure
  • Acid Reactive

Etiological: any infectious agent known or suspected to cause disease in humans.





  • Caustics
  • Acids