UN1831: Sulfuric acid, fuming
As listed: Sulfuric acid, fuming with less than 30 percent free sulfur trioxide
UN1831 appears 2 times in the Hazardous Materials Table (49 CFR §172.101). Hazard class 8, packing group I.
All §172.101 entries for UN1831
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Sulfuric acid, fuming with less than 30 percent free sulfur trioxide | 8 | I | 8 |
| Sulfuric acid, fuming with 30 percent or more free sulfur trioxide | 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 → Corrosive label · 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 UN1831 in the current PHMSA Emergency Response Guidebook.
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Common questions about UN1831
What is UN1831?
UN1831 is the identification number for Sulfuric acid, fuming in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN1831?
UN1831 is listed under hazard class 8 (corrosive).
What packing group is UN1831?
Packing group for UN1831: I. Where several rows exist, the packing group that fits your material decides which row applies.