UN3339: Refrigerant gas R 407B
UN3339 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 2.2.
All §172.101 entries for UN3339
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Refrigerant gas R 407B | 2.2 | — | 2.2 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Label codes (column 6): 2.2 → Non-flammable gas label.
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 UN3339 in the current PHMSA Emergency Response Guidebook.
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Common questions about UN3339
What is UN3339?
UN3339 is the identification number for Refrigerant gas R 407B in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN3339?
UN3339 is listed under hazard class 2.2 (non-flammable, non-poisonous gas).
What packing group is UN3339?
Packing group for UN3339: not assigned. Where several rows exist, the packing group that fits your material decides which row applies.