UN3543: Articles containing a substance which…
As listed: Articles containing a substance which in contact with water emits flammable gases, n.o.s.
UN3543 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 4.3.
All §172.101 entries for UN3543
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Articles containing a substance which in contact with water emits flammable gases, n.o.s. | 4.3 | — | 4.3 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Label codes (column 6): 4.3 → Dangerous when wet 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 UN3543 in the current PHMSA Emergency Response Guidebook.
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Common questions about UN3543
What is UN3543?
UN3543 is the identification number for Articles containing a substance which in contact with water emits flammable gases, n.o.s. in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN3543?
UN3543 is listed under hazard class 4.3 (dangerous when wet).
What packing group is UN3543?
Packing group for UN3543: not assigned. Where several rows exist, the packing group that fits your material decides which row applies.