Loading chemical detail...

Hazmat UN Number Lookup

Search hazardous materials database, check safety specifications, and view Emergency Response guides.

🏷️ Primary Hazard Class Filter

UN3543

Articles containing a substance which in contact with water emits flammable gases, n.o.s.

Dangerous When Wet

Class 4.3

CAS RegistryN/A (Mixture)

Hazchem / EAC4W

ERG Guide Number138

49 CFR Placards & Labels

Dangerous When WetClass 4.3

⇩ SVG

Not listed as a Reportable Quantity (RQ) hazardous substance under §172.101 Appendix A.

Not listed as a Marine Pollutant under §172.101 Appendix B.

Regulatory Facts

Packing Group

—

Symbols (col 1)

Labels (col 6)

4.3

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

None

Non-Bulk (col 8B)

§173.214

Bulk (col 8C)

§173.214

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

Forbidden

Cargo Aircraft Only (9B)

Forbidden

Vessel stowage (col 10)

Location (10A)

—

Other codes (10B)

—

Special provisions (col 7 — §172.102)

131 391

Hazard Classification & Risks

Class 4.3 — Dangerous when wet. Contact with water emits flammable or toxic gas (49 CFR §173.124).

Transport Regulations

Hazard class 4.3. Placard/label codes: 4.3. Special provisions: 131, 391. Packaging (49 CFR §173): exceptions §None, non-bulk §214, bulk §214. Quantity limits: passenger aircraft/rail Forbidden, cargo aircraft only Forbidden. Classified per 49 CFR §172.101.

Shortcuts:

p Printd SVGc Copy Names Copy Spilla Copy First-Aid

Source & sourcing note

Regulatory data mirrors the U.S. 49 CFR §172.101 Hazardous Materials Table and companion columns (packaging, quantity limits, vessel stowage, special provisions) as published by the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA).

Emergency-response content is drawn from the 2024 Emergency Response Guidebook (ERG), a joint publication of PHMSA, Transport Canada, and Mexico’s SCT.

The U.S. edition of the ERG and all U.S. federal regulations are public-domain works under 17 U.S.C. §105. Descriptions on this page are plain-English paraphrases; for any compliance decision, consult the authoritative text on eCFR Title 49 and the ERG at PHMSA.dot.gov. “ERG™” is attributed to PHMSA / Transport Canada / SCT and used nominatively.

Loading chemical detail...

Hazmat UN Number Lookup

Search hazardous materials database, check safety specifications, and view Emergency Response guides.

🏷️ Primary Hazard Class Filter

UN3543

Articles containing a substance which in contact with water emits flammable gases, n.o.s.

Dangerous When Wet

Class 4.3

CAS RegistryN/A (Mixture)

Hazchem / EAC4W

ERG Guide Number138

49 CFR Placards & Labels

Dangerous When WetClass 4.3

⇩ SVG

Not listed as a Reportable Quantity (RQ) hazardous substance under §172.101 Appendix A.

Not listed as a Marine Pollutant under §172.101 Appendix B.

Regulatory Facts

Packing Group

—

Symbols (col 1)

Labels (col 6)

4.3

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

None

Non-Bulk (col 8B)

§173.214

Bulk (col 8C)

§173.214

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

Forbidden

Cargo Aircraft Only (9B)

Forbidden

Vessel stowage (col 10)

Location (10A)

—

Other codes (10B)

—

Special provisions (col 7 — §172.102)

131 391

Hazard Classification & Risks

Class 4.3 — Dangerous when wet. Contact with water emits flammable or toxic gas (49 CFR §173.124).

Transport Regulations

Shortcuts:

p Printd SVGc Copy Names Copy Spilla Copy First-Aid

Source & sourcing note

Emergency-response content is drawn from the 2024 Emergency Response Guidebook (ERG), a joint publication of PHMSA, Transport Canada, and Mexico’s SCT.

UN3543 — Articles containing a substance which in contact with water emits flammable gases, n.o.s. · Hazmat Lookup · Tools2Ship · Tools2Ship