UN1942: Ammonium nitrate
As listed: Ammonium nitrate, with not more than 0.2% combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance
UN1942 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 5.1, packing group III.
All §172.101 entries for UN1942
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Ammonium nitrate, with not more than 0.2% combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance | 5.1 | III | 5.1 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Packing group ranks danger within the class: PG III = minor danger.
Label codes (column 6): 5.1 → Oxidizer 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 UN1942 in the current PHMSA Emergency Response Guidebook.
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Common questions about UN1942
What is UN1942?
UN1942 is the identification number for Ammonium nitrate in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN1942?
UN1942 is listed under hazard class 5.1 (oxidizer).
What packing group is UN1942?
Packing group for UN1942: III. Where several rows exist, the packing group that fits your material decides which row applies.