UN3309: Liquefied gas
As listed: Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone A
UN3309 appears 4 times in the Hazardous Materials Table (49 CFR §172.101). Hazard class 2.3.
All §172.101 entries for UN3309
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone A | 2.3 | — | 2.3, 2.1, 8 |
| Liquefied gas toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone B | 2.3 | — | 2.3, 2.1, 8 |
| Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone C | 2.3 | — | 2.3, 2.1, 8 |
| Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone D | 2.3 | — | 2.3, 2.1, 8 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Label codes (column 6): 2.3, 2.1, 8 → Poison gas label + subsidiary Flammable gas, Corrosive labels.
UN numbers are recognized for international and domestic transport.
Example basic description
Proper shipping name shown without the table's italic descriptive text. Order per §172.202: ID number, proper shipping name, hazard class, packing group. Example only — add technical names, “RQ”, quantities and other elements your shipment requires.
What to check next
- Match the name. Compare your SDS Section 14 to the proper shipping names above and pick the row with your packing group.
- Read the special provisions on the entry page (§172.102) — they can add limits or exceptions.
- Check packaging — the entry page lists the Part 173 sections for exceptions, non-bulk and bulk.
- Labels & placards. Placarding depends on class and quantity — see Table 1 vs Table 2.
- Emergency response. Find the response guide for UN3309 in the current PHMSA Emergency Response Guidebook.
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Common questions about UN3309
What is UN3309?
UN3309 is the identification number for Liquefied gas, toxic, flammable, corrosive, n.o.s.; Liquefied gas toxic, flammable, corrosive, n.o.s. in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN3309?
UN3309 is listed under hazard class 2.3 (poisonous (toxic) gas).
What packing group is UN3309?
Packing group for UN3309: not assigned. Where several rows exist, the packing group that fits your material decides which row applies.