UN2199: Phosphine
UN2199 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 2.3.
All §172.101 entries for UN2199
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Phosphine | 2.3 | — | 2.3, 2.1 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Label codes (column 6): 2.3, 2.1 → Poison gas label + subsidiary Flammable gas label.
UN numbers are recognized for international and domestic transport.
Reportable quantity (RQ)
- Phosphine is listed in Appendix A with an RQ of 100 lb (45.4 kg).
If a single package contains the RQ or more, the material is also a hazardous substance and “RQ” is added to the shipping description. How RQ is measured →
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 UN2199 in the current PHMSA Emergency Response Guidebook.
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Common questions about UN2199
What is UN2199?
UN2199 is the identification number for Phosphine in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN2199?
UN2199 is listed under hazard class 2.3 (poisonous (toxic) gas).
What packing group is UN2199?
Packing group for UN2199: not assigned. Where several rows exist, the packing group that fits your material decides which row applies.