UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 2244: Cyclopentanol

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2244 is assigned the proper shipping name Cyclopentanol 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 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

Cyclopentanol appears as a colorless viscous liquid with a pleasant odor. Slightly less dense than water. Vapors heavier than air. Used to make perfumes and pharmaceuticals.

CAS Number: 96-41-3
Molecular Formula: C5H10O
Molecular Weight: 86.13 g/mol
Color / Form: Colorless, viscous liquid
Odor: Odor of amyl alcohol, somewhat like peppermint
Boiling Point: 140.4 C @ 760 MM HG
Melting Point: -19 °C
Flash Point: 124 F
Specific Gravity: 0.9478 @ 20 C/4 C
Vapor Pressure: 2.49 [mmHg]
Vapor Density: 2.97 (heavier than air)
Water Solubility: SOL IN ALCOHOL, ETHER, ACETONE
Log P: log Kow = 0.71

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 2244 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.