UN/NA Number Reference
DOT Class 8 Corrosive placard

UN 2357: Cyclohexylamine

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2357 is assigned the proper shipping name Cyclohexylamine in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 8 Corrosive material, Packing Group II. Required label(s): 8.

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 132)

Hazards: HIGHLY FLAMMABLE. CORROSIVE. Causes burns. Vapors may form explosive mixture with air.

Fire: Alcohol-resistant foam, dry chemical, CO2. Do not use water jet. Cool containers.

Spill: Eliminate ignition sources. Do not touch. Stop leak if safe. Use foam.

Chemical and Physical Properties

Cyclohexylamine appears as a clear colorless to yellow liquid with an odor of ammonia. Flash point 90 °F. Irritates the eyes and respiratory system. Skin contact may cause burns. Less dense than water. Vapors heavier than air. Toxic oxides of nitrogen produced during combustion.

CAS Number: 108-91-8
Molecular Formula: C6H13N
Molecular Weight: 99.17 g/mol
Color / Form: Colorless or yellow liquid.
Odor: Strong, fishy, amine odor.
Boiling Point: 274.1 F
Melting Point: 0.1 °F (EPA, 1998)
Flash Point: 88 F
Autoignition: 560 °F (USCG, 1999)
Specific Gravity: 0.8647 (floats on water)
Vapor Pressure: 11 mmHg
Vapor Density: 3.42 (heavier than air)
Water Solubility: Very soluble
Log P: log Kow = 1.49
pH: STRONG BASE

Regulatory Data

EPCRA TPQ (40 CFR 355)
10000 lb
OSHA PEL
none
NIOSH REL
TWA 10 ppm (40 mg/m 3 )
IDLH
N

Special Provisions

49 CFR 172.102 special provision codes for this entry: IB2, T7, TP2. 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 2357 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.