What is UN 3491?
UN 3491: Toxic by inhalation liquid, water-reactive, flammable, n.o.s.. US class 6.1; PG I.
- UN number
- UN 3491
- Proper shipping name (first listed)
- Toxic by inhalation liquid, water-reactive, flammable, n.o.s.
- US class or division (first name)
- 6.1
- Packing groups (first name)
- I
- Source rows for this UN number
- 1
- Table jurisdiction
- United States HMT; not an ADR table
- Version
- 49 CFR 172.101, revised 1 October 2025
- Official source
- US Government Publishing Office, 49 CFR 172.101 HMT
Source row 3402
Proper shipping name: Toxic by inhalation liquid, water-reactive, flammable, n.o.s..
Full column-2 description: Toxic by inhalation liquid, water-reactive, flammable, n.o.s. with an LC50 lower or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50
US hazard class or division: 6.1. Packing group: I.
Column-1 symbols: G.
Before shipping
Check the current ADR edition before shipping. This is a US HMT reference snapshot, not ADR classification or shipping, legal or safety advice.
This page omits the other HMT columns. Check the full official table, its symbols and applicable provisions for your consignment.
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