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Flammable solids or substances

IMO classes for dangerous goods

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 IMO classes:Class 1Class 2Class 3Class 4Class 5Class 6Class 7Class 8Class 9

Flammable solids or substances

Flammable solids  
Subclass 4.1: Flammable solids

Solid substances that are easily ignited. Self-reactive materials, which are thermally unstable and that can undergo a strongly exothermic decomposition even without participation of air. Readily combustible solids that can cause a fire through friction and show a burning rate faster than 2.2 mm (0.087 inches) per second, or metal powders that can be ignited and react over the whole length of a sample in 10 minutes or less.
Spontaneously combustible solids  
Subclass 4.2: Spontaneously combustible solids

Solid substances that ignite spontaneously. Spontaneously combustible material is a pyrophoric material, which is a liquid or solid that can ignite within five minutes after coming in contact with air or a self-heating material that when in contact with air and without an energy supply is liable to self-heat.
Dangerous when wet  
Subclass 4.3: Dangerous when wet

Solid substances that emit a flammable gas when wet. Dangerous when wet material is a material that when it makes contact with water is liable to become spontaneously flammable or give off flammable or toxic gas at a rate greater than 1 L per kilogram of the material per hour.

Class 1 - Explosives hazard
Class 2 - Gases: compressed, liquefied or dissolved under pressure
Class 3 - Flammable liquids
Class 4 - Flammable solids or substances
Class 5 - Oxidizing substances and organic peroxides
Class 6 - Toxic and infectious substances
Class 7 - Radioactive substances
Class 8 - Corrosive substances
Class 9 - Miscellaneous dangerous substances and articles
Other hazardous materials

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