UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 2296: Methylcyclohexane

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2296 is assigned the proper shipping name Methylcyclohexane 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 128)

Hazards: HIGHLY FLAMMABLE. Vapors may form explosive mixtures with air. Vapors heavier than air. Runoff may pollute waterways.

Fire: Small: dry chemical, CO2, water spray, regular foam. Large: water spray, fog, regular foam. Do not use straight streams.

Spill: Eliminate ignition sources. Stop leak if safe. Use foam to suppress vapors. Absorb with earth, sand, or other absorbent. Prevent runoff to waterways.

Chemical and Physical Properties

Methylcyclohexane appears as a clear colorless liquid with a petroleum-like odor. Flash point 25 °F. Less dense than water and insoluble in water. Vapors heavier than air.

CAS Number: 108-87-2
Molecular Formula: C7H14
Molecular Weight: 98.19 g/mol
Color / Form: COLORLESS LIQUID
Odor: Faint, benzene-like odor.
Boiling Point: 213.8 F
Melting Point: -194.8 °F (USCG, 1999)
Flash Point: 25 F
Autoignition: 482 °F (USCG, 1999)
Specific Gravity: 0.77 (floats on water)
Vapor Pressure: 83.29 mmHg
Vapor Density: 3.39 (air= 1)
Water Solubility: Insoluble
Log P: log Kow = 3.61

Regulatory Data

OSHA PEL
TWA 500 ppm (2000 mg/m 3 )
NIOSH REL
TWA 400 ppm (1600 mg/m 3 )
IDLH
1200 ppm [LEL]

Special Provisions

49 CFR 172.102 special provision codes for this entry: B1, IB2, T4, 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.

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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.