H271 — May cause fire or explosion; strong oxidizer
The GHS hazard statement for oxidizing liquids and solids, category 1. Here is what it means, the label elements that travel with it, and the substances that carry it.
At a glance
| Official statement | May cause fire or explosion; strong oxidizer. |
| Hazard class | Oxidizing liquids and solids |
| Category | Category 1 |
| Signal word | Danger |
| Pictogram |  GHS03 — Flame over circle |
What it means
Chemicals that feed a fire with oxygen. They are not necessarily combustible themselves, but they can make other materials ignite more easily and burn more intensely.
Precautionary statements paired with H271
When the engine writes SDS Section 2 or a container label for a product carrying H271, these are the P-codes it assigns, in the official Annex 3 groups:
| Prevention | P210 | Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. |
| P220 | Keep away from clothing and other combustible materials. | |
| P280 | Wear protective gloves/protective clothing/eye protection/face protection. | |
| Response | P370 | In case of fire: |
| Disposal | P501 | Dispose of contents/container in accordance with local/regional/national/international regulations. |
Substances that carry H271
3 of the 4,225 substances in our database carry H271 when classified in pure form — recognizable examples:
- hydrogen peroxide solution — CAS 7722-84-1
- chromyl dichloride — CAS 14977-61-8
- perchloric acid — CAS 7601-90-3
Same hazard class: H272
The engine writes these for you.
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.