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Hazard Labeling Systems - Red
Flammability - Susceptibility of Material to Burning

A note about the word inflammable:
Inflammable means the material will burn. Today, the word "flammable" has replaced "inflammable" almost entirely, but don't be confused if you encounter the older term.

0 Material will not burn. Example: water
1 Material must be pre-heated before ignition can occur. Example: corn oil
2
Material must be moderately heated or exposed to relatively high ambient temperature before ignition can occur.
Example: diesel fuel oil
3
Liquids and solids that can be ignited under almost all ambient temperature conditions.
 Example: gasoline
4
Materials that will rapidly or completely vaporize at atmospheric pressure and normal ambient temperature, or that are readily dispersed in air and that will burn readily.
 Example: propane gas

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