GHS precautionary statement
P403: Store in a well-ventilated place
- P403
- Storage
P403 says: “Store in a well-ventilated place”. It is a storage statement. P400 series: how and where to store the product, such as keeping it cool, dry, locked up or in a well-ventilated place.
About the storage group
P400 series: how and where to store the product, such as keeping it cool, dry, locked up or in a well-ventilated place. See all precautionary statements for the full list.
Hazards that call for P403
The GHS data recommends P403 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 |
| H227 | Combustible liquid | Flammable liquids — Category 4 | Warning |
| H230 | May react explosively even in the absence of air | Flammable gases — 1A, Chemically unstable gas A | Danger |
| H231 | May react explosively even in the absence of air at elevated pressure and/or temperature | Flammable gases — 1A, Chemically unstable gas B | Danger |
| H232 | May ignite spontaneously if exposed to air | Flammable gases — 1A, Pyrophoric gas | Danger |
| H240 | Heating may cause an explosion | Self-reactive substances and mixtures; Organic peroxides — Type A | Danger |
| H241 | Heating may cause a fire or explosion | Self-reactive substances and mixtures; Organic peroxides — Type B | Danger |
| H242 | Heating may cause a fire | Self-reactive substances and mixtures; Organic peroxides — Type C, D Self-reactive substances and mixtures; Organic peroxides — Type E, F | Danger |
| H270 | May cause or intensify fire; oxidizer | Oxidizing gases — Category 1 | Danger |
| H281 | Contains refrigerated gas; may cause cryogenic burns or injury | Gases under pressure — Refrigerated liquefied gas | Warning |
| H334 | May cause allergy or asthma symptoms or breathing difficulties if inhaled | Sensitization, respiratory — Category 1, 1A, 1B | Danger |
Chemicals using P403
21 chemicals in our database. Classification comes from each chemical's primary GHS source, so a supplier's SDS may differ.
P403 frequently asked questions
What does P403 mean?
P403 says: "Store in a well-ventilated place". It is a storage precautionary statement in the Storage (P400 series).
Which hazards call for P403?
In the GHS data, P403 is recommended for hazard statements H220, H221, H227, H230, H231, H232, H240, H241, H242, H270, H281, H334.
What type of statement is P403?
P403 is in the Storage (P400 series). P400 series: how and where to store the product, such as keeping it cool, dry, locked up or in a well-ventilated place.
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)