HazMat Tool — substance information

Isobutyryl chloride

HMT 15 June 2026
Reference only — HMT snapshot for inspection and audit support; not a shipping paper, placard mandate, or CVI record. Use Print / PDF below for field notes.
UN / ID
UN 2395
Hazard class
3
Packing group
II
ERG guide
ERG 132
Special provisions
SP IB1, SP T7, SP TP2
Source
49 CFR §172 (15 June 2026)

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Isobutyryl chloride


Isobutyryl chloride (2-methylpropanoyl chloride) is the organic compound with the formula (CH3)2CHCOCl. A colorless liquid, it the simplest branched-chain acyl chloride. It is prepared by chlorination of isobutyric acid Wikipedia

Emergency Response Guide No. 132

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

3
Flammable liquids

(4) Identification number Help

UN 2395

(5) Packing Group Help

II

(6) Labels Help

Flammable liquids (3) Corrosive liquids (8)

(7) Special Provisions (§172.102) Help

×Note:
Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs.
IB1
T7
TP2

(8) Packing Authorizations (§173.***) Help

(8A) Exceptions150see 49 CFR §173.150
(8B) Non-bulk202see 49 CFR §173.202
(8C) Bulk243see 49 CFR §173.243

(9) Quantity Limits Help

(9A) Passenger aircraft/rail1 L
(9B) Cargo aircraft only5 L

(10) Vessel stowage Help

(10A) Location
(10B) Other

Segregation chart for load, transport, and storage

This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.

Prohibited Must not be loaded, transported, or stored together in the same vehicle or facility.
Permitted May be loaded, transported, or stored together.
Restricted May be loaded, transported, or stored together only with restrictions.

Similar substances

UN / IDProper shipping nameHazard class
tert-Butyl peroxyisobutyrate, with more than 77 percent in solutionForbidden
UN 2045Isobutyraldehyde or Isobutyl aldehyde3