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1670

UN 1670Perchloromethyl mercaptan

Division 6.1

Toxic substances

Summary

UN 1670 is the UN number for perchloromethyl mercaptan. It is classed in Division 6.1 (toxic substances) of Class 6 for transport. Packing group I. Emergency responders use ERG guide 157.

Emergency response

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

  • Guide157Perchloromethyl mercaptanHighlighted 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 1670
Name
Perchloromethyl mercaptan
Hazard class
Class 6: Toxic and infectious substances
Division
6.1: Toxic substances
Packing group
I
What the class covers
Substances liable to cause death, serious injury or harm to health if swallowed, inhaled or absorbed through the skin.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN1670Perchloromethyl mercaptan

    Special provisions: 2, B9, B14, B32, N34, T20, TP2, TP13, TP38, TP45

    Class
    6.1
    Packing group
    I
    Labels
    6.1

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 6

Class 6 covers poisons and infectious material. Division 6.1 is toxic substances that harm people if swallowed, inhaled or absorbed through the skin; 6.2 is infectious substances such as cultures and medical waste.

See all Class 6 UN numbers

Check the official sources

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