UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1143: Crotonaldehyde, stabilized

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1143 is assigned the proper shipping name Crotonaldehyde, stabilized in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 6.1 Toxic Substance material, Packing Group I. Required label(s): 6.1, 3.

Packing group indicates the degree of danger within a hazard class: PG I is high danger, PG II medium, PG III low. The proper shipping name, hazard class, UN number, and packing group together form the basic shipping description that must appear on shipping papers and, where required, on the package and placard.

Emergency Response (ERG Guide 131)

Hazards: HIGHLY FLAMMABLE. TOXIC. May be fatal if inhaled, swallowed, or absorbed through skin. Vapors heavier than air.

Fire: Small: dry chemical, CO2, water spray, alcohol-resistant foam. Large: water spray, fog, alcohol-resistant foam.

Spill: Eliminate ignition sources. Do not touch. Stop leak if safe. Use vapor-suppressing foam. Ventilate area.

Chemical and Physical Properties

Crotonaldehyde, stabilized appears as a clear colorless to straw colored liquid with a penetrating pungent odor. Flash point 55 °F. Density 7.1 lb / gal. Very toxic by inhalation. May polymerize with the release of heat under exposure to heat or contamination. If polymerization takes place inside a container, the container may rupture violently. Less dense than water. Vapors heavier than air.

CAS Number: 4170-30-3
Molecular Formula: C4H6O
Molecular Weight: 70.09 g/mol
Color / Form: Water-white, mobile liquid
Odor: Pungent, suffocating odor
Boiling Point: 219 F
Melting Point: -105 °F (EPA, 1998)
Flash Point: 55 F
Autoignition: 450 °F (USCG, 1999)
Specific Gravity: 0.853 (floats on water)
Vapor Pressure: 19 mmHg at 68 F
Vapor Density: 2.41 (heavier than air)
Water Solubility: less than 0.1 mg/mL at 65.3 F
Log P: 0.63 (calculated)

Regulatory Data

CERCLA RQ (40 CFR 302.4)
100 lb
EPCRA TPQ (40 CFR 355)
1000 lb
OSHA PEL
TWA 2 ppm (6 mg/m 3 )
NIOSH REL
TWA 2 ppm (6 mg/m 3 )
IDLH
50 ppm
RCRA Waste Code(s)
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A release of this material at or above its CERCLA reportable quantity (100 lb) requires immediate notification to the National Response Center at 800-424-8802.

Special Provisions

49 CFR 172.102 special provision codes for this entry: 2, 175, 387, B9, B14, B32, B77, T20, TP2, TP13, TP38, TP45. These codes modify the general requirements (packaging, quantity limits, exceptions) for this specific material. Look up each code in 49 CFR 172.102 for the full text.

Need the full interactive record? Open UN 1143 in the SpillNerd lookup tool for the live database entry with placard graphics, GHS pictograms, full segregation tables, and synonym search. For another material, use the UN number and chemical lookup.

Reference data compiled from the DOT Hazardous Materials Table (49 CFR 172.101), the 2024 Emergency Response Guidebook, and public chemical databases (PubChem, NIOSH, EPA). Always verify the correct shipping description against the current regulation and the manufacturer's SDS Section 14 before shipping.