GHS hazard statement
H251
Self-heating in large quantities; may catch fire
GHS02 · Flame- Hazard group
- Physical hazards
- Hazard class
- Self-heating substance
- Signal word
- Warning
What H251 means
H251 is the GHS (Globally Harmonized System) hazard statement “Self-heating in large quantities; may catch fire.” It belongs to the Self-heating substance hazard class and appears in Section 2 of a Safety Data Sheet and on the product label when a substance or mixture meets the classification criteria for that class and category.
Where H251 applies, GHS assigns the signal word Warning and the GHS02 (Flame) pictogram. The exact signal word and pictogram set on a finished label come from the whole classification — the most severe endpoint drives the signal word, so a milder statement can be present without changing an already-Danger label.
Related statements — Self-heating substance
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Reference information, not a compliance determination. Actual label elements depend on the full classification of your specific substance or mixture and require review by a qualified professional.