UNunnums
3257

UN 3257Elevated temperature liquid, n.o.s., at or above 100° C and below its flashpoint (including molten metals, molten salts, etc.)

Class 9

Miscellaneous dangerous goods

Summary

UN 3257 is the UN number for elevated temperature liquid, n.o.s., at or above 100° C and below its flashpoint (including molten metals, molten salts, etc.). It is classed in Class 9 (miscellaneous dangerous goods) for transport. Packing group III. Emergency responders use ERG guide 171.

Emergency response

The Emergency Response Guidebook (ERG2024) guide for this number:

  • Guide171Elevated temperature liquid, n.o.s., at or above 100°C (212°F), and below its flash point

From the 2024 Emergency Response Guidebook (ERG2024), published by U.S. Department of Transportation, PHMSA. Read the full guide in the ERG or on CAMEO Chemicals.

Identification

UN number
UN 3257
Name
Elevated temperature liquid, n.o.s., at or above 100° C and below its flashpoint (including molten metals, molten salts, etc.)
Hazard class
Class 9: Miscellaneous dangerous goods
Packing group
III
What the class covers
Substances and articles which present a hazard during transport not covered by other classes, such as lithium batteries and environmentally hazardous substances.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN3257Elevated temperature liquid, n.o.s.

    at or above 100 C and below its flash point (including molten metals, molten salts, etc.)

    • Technical name required in parentheses

    Special provisions: IB1, T3, TP3, TP29

    Class
    9
    Packing group
    III
    Labels
    9

From the eCFR edition of 49 CFR 172.101 dated 2026-10-05 (section last amended 2026-09-08). The eCFR is an editorial compilation, not the official legal edition. Read the current table.

About Class 9

Class 9 covers dangerous goods that don't fit any other class, including lithium batteries, dry ice, environmentally hazardous substances, elevated-temperature materials and magnetized material.

See all Class 9 UN numbers

Check the official sources

For emergency response, packaging and quantity limits, use these: