GHS precautionary statement
P377: Leaking gas fire: Do not extinguish, unless leak can be stopped safely
- P377
- Response
P377 says: “Leaking gas fire: Do not extinguish, unless leak can be stopped safely”. It is a response statement. P300 series: what to do after a spill, exposure or fire, including first-aid steps and when to call a poison center or doctor.
About the response group
P300 series: what to do after a spill, exposure or fire, including first-aid steps and when to call a poison center or doctor. See all precautionary statements for the full list.
Hazards that call for P377
The GHS data recommends P377 for these hazard statements.
| Code | Statement | Hazard class and category | Signal word |
|---|---|---|---|
| H220 | Extremely flammable gas | Flammable gases — 1A: Flammable gas, Pyrophoric gas, Chemically unstable gas A,B | Danger |
| H221 | Flammable gas | Flammable gases — 1B Flammable gases — Category 2 | Danger |
| H232 | May ignite spontaneously if exposed to air | Flammable gases — 1A, Pyrophoric gas | Danger |
Chemicals using P377
10 chemicals in our database. Classification comes from each chemical's primary GHS source, so a supplier's SDS may differ.
P377 frequently asked questions
What does P377 mean?
P377 says: "Leaking gas fire: Do not extinguish, unless leak can be stopped safely". It is a response precautionary statement in the Response (P300 series).
Which hazards call for P377?
In the GHS data, P377 is recommended for hazard statements H220, H221, H232.
What type of statement is P377?
P377 is in the Response (P300 series). P300 series: what to do after a spill, exposure or fire, including first-aid steps and when to call a poison center or doctor.
Precautionary statements are general recommendations. Follow the specific instructions on your product's label and safety data sheet.
https://pubchem.ncbi.nlm.nih.gov/ghs/ghscode_10.txt (UN GHS Revision 10, retrieved 2026-10-12)