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Class 4 - Flammable Solids; Substances liable to spontanious combustion; Substances that on contact with water emit flammable gases. |
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4.1 - A solid that under normal conditions of transport is readily combustible, or would casue or contribute to fire through friction or from heat retained from manufacturing or processing, or is a self-reactive substance that is liable to undergo a strongly exothermic reaction, or is a desensitized explosive that is liable to explode if they are not diluted sufficiently to suppress their explosive properties. Commonly used in lacquers (example: nitrocellulose). |
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| 4.2 - A substance liable to spontaneous combustion, under normal conditions of transport, or when in contact with air, liable to spontaneous heating to the point where it ignites. Commonly used in rocket fuel (example: diethylzinc). |  |
| 2.3 - Toxic Gas. Commonly used in pulp bleaching (example: sulphur dioxide) |  |
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