HomeUN NumbersClass 4.2UN3394
Hazard Class 4.2Packing Group I

UN Number

UN3394

Organometallic substance, liquid, pyrophoric, water-reactive

Official source: 49 CFR 172.101 (eCFR)

Hazardous Materials Table entry

One row in 49 CFR 172.101 for UN3394.

Sym.DescriptionClassPGLabelsSpecial provisions8A8B8C9A9B10A10B
GOrganometallic substance, liquid, pyrophoric, water-reactive4.2I4.2, 4.3B11, T21, TP2, TP7, TP36, TP47None181244ForbiddenForbiddenD13, 52, 78, 148
  • Sym.: Column 1 symbols, 49 CFR 172.101(b).
  • Description: Column 2, the proper shipping name, 172.101(c).
  • Class: Column 3, hazard class or division, 172.101(d).
  • PG: Column 5, packing group, 172.101(f).
  • Labels: Column 6, label codes, 172.101(g).
  • Special provisions: Column 7, codes explained in 49 CFR 172.102, 172.101(h).
  • 8A / 8B / 8C: Packaging exceptions, non-bulk and bulk sections of 49 CFR part 173 (an entry of 202 means 173.202), 172.101(i).
  • 9A / 9B: Maximum quantity per package on passenger aircraft or rail, and on cargo aircraft only, 172.101(j).
  • 10A / 10B: Vessel stowage location and other stowage and handling codes, 172.101(k).

Division 4.2 — Spontaneously Combustible Material

See the full class list

Spontaneously combustible material (Division 4.2) includes a pyrophoric material — a liquid or solid that, even in small quantities and without an external ignition source, can ignite within five minutes after coming in contact with air — and self-heating material.

Source: 49 CFR 173.124 (eCFR).

Previous / next UN number

UN3393Organometallic substance, solid, pyrophoric, water-reactiveUN3395Organometallic substance, solid, water-reactive

Nearby Class 4.2 UN Numbers

UN3342XanthatesUN3391Organometallic substance, solid, pyrophoricUN3392Organometallic substance, liquid, pyrophoricUN3400Organometallic substance, solid, self-heatingUN3497Krill mealUN3542Articles containing a substance liable to spontaneous combustion, n.o.s.
View the full Class 4.2 list →

Shipping a UN3394 Stream?

SymbioFlows matches your classified waste stream with verified recovery off-takers. Get a compliance-grounded recovery analysis with market benchmarks in minutes.

Request Recovery Analysis

Reviewed by our regulatory specialist within 1 business day.