The product catches fire readily — from an ignition source, from heat, or in some classes spontaneously in air. On liquids, the category is set by flash point and boiling point.
This is the official UN GHS artwork — public domain, free to reuse in training decks, wall posters, workplace signs, and labels.
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On a printed label the symbol must sit in the red diamond frame, point-up, as shown — the frame is part of the pictogram.
| H224 | Extremely flammable liquid and vapor. |
| H225 | Highly flammable liquid and vapor. |
| H226 | Flammable liquid and vapor. |
When SDS HQ authors an SDS or a container label, it assigns the hazard statements, signal word, pictograms, and precautionary statements from these same tables — automatically, with the calculation shown.