HazMat Tool — substance information

Acetaldehyde

HMT May 2026
UN / ID
UN 1089
Hazard class
3
Packing group
I
ERG guide
ERG 129P
Special provisions
SP B16, SP T11, SP TP2, SP TP7
Source
49 CFR §172 (2026/05)

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Acetaldehyde


Acetaldehyde (IUPAC systematic name ethanal) is an organic chemical compound with the formula CH3CH=O. It is a colorless liquid or gas, boiling near room temperature. It is one of the most important aldehydes, occurring widely in nature and being produced on a large scale in industry. Acetaldehyde occurs naturally in coffee, bread, and ripe fruit, and is produced by plants. Wikipedia

Emergency Response Guide No. 129P

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

3
Flammable liquids

(4) Identification number Help

UN 1089

(5) Packing Group Help

I

(6) Labels Help

Flammable liquids (3) Cargo Aircraft Only (Cargo Aircraft Only)

(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.
B16
T11
TP2
TP7

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

(8A) ExceptionsNone
(8B) Non-bulk201see 49 CFR §173.201
(8C) Bulk243see 49 CFR §173.243

(9) Quantity Limits Help

(9A) Passenger aircraft/railForbidden
(9B) Cargo aircraft only30 L

(10) Vessel stowage Help

(10A) Location
(10B) Other n/a

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
UN 1841Acetaldehyde ammonia9
UN 2332Acetaldehyde oxime3