UN1829: Sulfur trioxide, stabilized
UN1829 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 8, packing group I.
All §172.101 entries for UN1829
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Sulfur trioxide, stabilized | 8 | I | 8, 6.1 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Packing group ranks danger within the class: PG I = great danger.
Label codes (column 6): 8, 6.1 → Corrosive label + subsidiary Poison / Toxic 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 UN1829 in the current PHMSA Emergency Response Guidebook.
Get the HazmatTable Field Guide poster pack
8 printable hazmat reference posters — reading a table entry, hazard classes, placards, segregation, shipping papers and more. Free, sent to your inbox.
Common questions about UN1829
What is UN1829?
UN1829 is the identification number for Sulfur trioxide, stabilized in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN1829?
UN1829 is listed under hazard class 8 (corrosive).
What packing group is UN1829?
Packing group for UN1829: I. Where several rows exist, the packing group that fits your material decides which row applies.