# Class 4 | Flammable Solids or Substances |
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4.1 | Flammable solids Ex : Nitrocellulose, Magnesium |
4.2 | Substances liable to spontaneous combustion Ex : Aluminum Alkyls, White Phosphorus |
4.3 | Substances which in contact with water emit flammable gases. Ex : Sodium, Calcium, Potassium |