UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 1123: Butyl acetates

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1123 is assigned the proper shipping name Butyl acetates 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 129)

Hazards: Flammable. Irritating vapor. May cause dizziness. Toxic if inhaled or absorbed through skin.

Fire: Alcohol-resistant foam, dry chemical, CO2, water spray.

Spill: Eliminate ignition sources. Ventilate area. Absorb with earth or sand.

Chemical and Physical Properties

Watery colorless liquid with a pleasant, fruity odor. Floats on water. Produces irritating vapor. (USCG, 1999)

CAS Number: 123-86-4
Molecular Formula: C6H12O2
Molecular Weight: 116.16 g/mol
Color / Form: Colorless liquid
Odor: HAS FRUITY ODOR CHARACTERISTIC OF ACETATE ESTERS
Boiling Point: 234 F
Melting Point: -100 °F (USCG, 1999)
Flash Point: 62 F
Autoignition: 760 °F (USCG, 1999)
Specific Gravity: 0.872 (floats on water)
Vapor Pressure: 51.7 mmHg
Vapor Density: 4.0 (heavier than air)
Water Solubility: 0.8 %
Log P: log Kow = 1.72

Regulatory Data

CERCLA RQ (40 CFR 302.4)
5000 lb
OSHA PEL
TWA 200 ppm (950 mg/m 3 )
NIOSH REL
TWA 200 ppm (950 mg/m 3 )
IDLH
1700 ppm [10%LEL]

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 1123 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.