UN/NA Number Reference

UN 1157: Diisobutyl ketone

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1157 is assigned the proper shipping name Diisobutyl ketone in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 3 Flammable Liquid material, Packing Group III. 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

Ethyl chloride appears as a clear colorless gas with a pungent odor. Flash point -58 °F. Boiling point 54 °F. Less dense than water and insoluble in water. Vapors are heavier than air. Under prolonged exposure to fire or heat the containers may rupture violently and rocket.

CAS Number: 75-00-3

Molecular Formula: C2H5Cl

Molecular Weight: 142.24 g/mol

Color / Form: COLORLESS LIQUID

Odor: Ethereal odor

Boiling Point: 331 F

Melting Point: -218 °F (NTP, 1992)

Flash Point: 140 F

Autoignition: 966 °F (USCG, 1999)

Specific Gravity: 0.806 (floats on water)

Vapor Pressure: 2.4 mmHg

Vapor Density: 4.9 (air= 1)

Water Solubility: Slightly soluble

Log P: log Kow= 1.43

Regulatory Data

CERCLA RQ (40 CFR 302.4)

100 lb

OSHA PEL

TWA 1000 ppm (2600 mg/m 3 )

NIOSH REL

Handle with caution in the workplace.

IDLH

3800 ppm [10%LEL]

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: B1, IB3, T2, 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 1157 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.