Division 2.1 — Flammable gas
Gases ignitable at 20 °C and standard pressure, including aerosols with a flammable propellant.
Carrier acceptance
The published default for this class. A UN-specific rule can override it — lithium batteries and dry ice are both Class 9 and are treated quite differently.
| Carrier | Ground | Air | Position |
|---|---|---|---|
| UPS | contract required | contract required | Flammable gases and flammable aerosols above limited quantity need the hazmat agreement. Aerosols of 1 L or less usually qualify as limited quantity by ground. |
| FedEx | contract required | contract required | Flammable gases and aerosols above limited quantity require dangerous goods approval. |
| USPS | restricted | prohibited | Flammable aerosols are mailable by surface only, in limited quantity, and only when the container is 1 L or less and meets the Publication 52 packaging standard. |
| Amazon FBA | review required | restricted | Flammable aerosols are accepted only after dangerous goods review, and only within the limited quantity thresholds. Many aerosol ASINs are approved for ground fulfilment only. |
Carrier positions encode each carrier's published default as of the ruleset date. Tariffs change more often than regulations, and a contracted shipper may hold different terms — confirm against the carrier's current guide before the first shipment of a new item.
Encoded entries (3)
| UN | Proper shipping name | Class | PG | Labels | Air |
|---|---|---|---|---|---|
| UN1950 | Aerosols, flammable | 2.1 | none | FLAMMABLE GAS | pax limited·cargo permitted |
| UN1057 | Lighters or Lighter refills | 2.1 | none | FLAMMABLE GAS | pax forbidden·cargo forbidden |
| UN1978 | Propane | 2.1 | none | FLAMMABLE GAS | pax forbidden·cargo forbidden |
Classify a specific product in this class
The class alone does not give you a shipping paper. Send the actual product to POST /api/classify and you get the UN number, the proper shipping name, the packing group and every carrier position for that specific item.
Questions
- What is Division 2.1 — Flammable gas?
- Gases ignitable at 20 °C and standard pressure, including aerosols with a flammable propellant.
- Does Division 2.1 — Flammable gas have a packing group?
- No. Entries in this class carry no packing group; the class or division alone determines the packaging and labelling requirements. Assigning a packing group here is a common error on shipping papers.
- Can I ship Division 2.1 — Flammable gas by air?
- UPS: contract required; FedEx: contract required; USPS: prohibited; Amazon FBA: restricted. These are published carrier defaults, not regulatory limits — a contracted shipper may hold different terms, and the regulation may permit what the carrier declines.