UNunnums
1250

UN 1250Methyltrichlorosilane

Class 3

Flammable liquids

Summary

UN 1250 is the UN number for methyltrichlorosilane. It is classed in Class 3 (flammable liquids) for transport. Packing group II. Emergency responders use ERG guide 155.

Emergency response

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

  • Guide155MethyltrichlorosilaneHighlighted 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 1250
Name
Methyltrichlorosilane
Hazard class
Class 3: Flammable liquids
Packing group
II
What the class covers
Flammable liquids (and, in the U.S., combustible liquids).

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN1250Methyltrichlorosilane

    Special provisions: A7, B6, B77, N34, T10, TP2, TP7, TP13

    Class
    3
    Packing group
    II
    Labels
    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 3

Class 3 covers flammable liquids such as gasoline, diesel, solvents, paints and alcohols. In the United States, some liquids with higher flash points can also be shipped as combustible liquids under the same class.

See all Class 3 UN numbers

Check the official sources

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