UN/NA Number Reference

UN 1090: Acetone

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1090 is assigned the proper shipping name Acetone in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 3 Flammable Liquid material, Packing Group II. Required label(s): 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 127)

Hazards: HIGHLY FLAMMABLE. Vapors may form explosive mixtures with air. Vapors heavier than air, travel to ignition source and flash back. Runoff may cause fire/explosion.

Fire: Small: dry chemical, CO2, water spray or alcohol-resistant foam. Large: water spray, fog or alcohol-resistant foam. Do not use straight streams. Cool tanks with water.

Spill: Eliminate ignition sources. Ground equipment. Stop leak if safe. Use vapor-suppressing foam. Absorb with earth/sand. Dike large spills. Water spray may reduce vapor.

Chemical and Physical Properties

Acetone appears as a clear colorless liquid with a sweetish odor. Flash point 0 °F. Less dense than water. Vapors are heavier than air. Used as a solvent in paint and nail polish removers.

CAS Number: 67-64-1

Molecular Formula: C3H6O

Molecular Weight: 58.08 g/mol

Color / Form: Colorless volatile liquid

Odor: Fruity odor

Boiling Point: 133 F

Melting Point: -137 °F (NTP, 1992)

Flash Point: 0 F

Autoignition: 869 °F (USCG, 1999)

Specific Gravity: 0.791 (floats on water)

Vapor Pressure: 180 mmHg at 68 F

Vapor Density: 2 (heavier than air)

Water Solubility: greater than or equal to 100 mg/mL at 72 F

Log P: log Kow = -0.24

Regulatory Data

CERCLA RQ (40 CFR 302.4)

5000 lb

OSHA PEL

1000 2400 500 ppm (ST) 750 ppm (C) 3000 ppm

NIOSH REL

TWA 250 ppm (590 mg/m 3 )

IDLH

2500 ppm [10%LEL]

RCRA Waste Code(s)

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A release of this material at or above its CERCLA reportable quantity (5000 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: IB2, T4, TP1. 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 1090 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.