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Class I - Gases
  • Group A - Acetylene
  • Group B - Hydrogen; Fuel and combustible process gases with more than 30% hydrogen, butadiene, ethylene oxide, etc.
  • Group C - ethyl ether, ethylene, gases of equivalent hazard
  • Group D - acetone, ammonia, benzene, ethanol, gasoline, natural gas, propane, ... ; gases of equivalent hazard
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