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1295

UN 1295Trichlorosilane

Division 4.3

Dangerous when wet

Summary

UN 1295 is the UN number for trichlorosilane. It is classed in Division 4.3 (dangerous when wet) of Class 4 for transport. Packing group I. Emergency responders use ERG guide 139.

Emergency response

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

  • Guide139TrichlorosilaneHighlighted in green: see Table 1

Highlighted in green in the ERG. If there is no fire, go to ERG Table 1 for initial isolation and protective action distances, and also use the guide. If a fire is involved, use the guide's evacuation distances and protect downwind according to Table 1.

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 1295
Name
Trichlorosilane
Hazard class
Class 4: Flammable solids
Division
4.3: Dangerous when wet
Packing group
I
What the class covers
Substances which, in contact with water, emit flammable gases.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN1295Trichlorosilane

    Special provisions: N34, T14, TP2, TP7, TP13, W31

    Class
    4.3
    Packing group
    I
    Labels
    4.3, 3, 8

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 4

Class 4 covers flammable solids and other substances that can catch fire. Division 4.1 is flammable solids and self-reactive substances, 4.2 is substances that can spontaneously combust in air, and 4.3 is substances that give off flammable gas when wet.

See all Class 4 UN numbers

Check the official sources

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