UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 1865: n-Propyl nitrate

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1865 is assigned the proper shipping name n-Propyl nitrate 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 131)

Hazards: HIGHLY FLAMMABLE. TOXIC. May be fatal if inhaled, swallowed, or absorbed through skin. Vapors heavier than air.

Fire: Small: dry chemical, CO2, water spray, alcohol-resistant foam. Large: water spray, fog, alcohol-resistant foam.

Spill: Eliminate ignition sources. Do not touch. Stop leak if safe. Use vapor-suppressing foam. Ventilate area.

Chemical and Physical Properties

N-propyl nitrate appears as a white to straw-colored liquid with an ether-like odor. About the same density as water and insoluble in water. Flash point 70 °F. Vapors heavier than air. Used as a fuel. Shock sensitive. The shock sensitivity is removed by addition of 1-2% of propane, butane, chloroform, ethyl ether, or methyl ether.

CAS Number: 627-13-4
Molecular Formula: C3H7NO3
Molecular Weight: 105.09 g/mol
Color / Form: Pale yellow liquid
Odor: Sweet sickly odor
Boiling Point: 231 F
Melting Point: less than -150 °F (USCG, 1999)
Flash Point: 68 F
Autoignition: 347 °F (USCG, 1999)
Specific Gravity: 1.06 (sinks in water)
Vapor Pressure: 18 mmHg
Vapor Density: 3.6 (heavier than air)
Water Solubility: Slight
Log P: log Kow = 1.74 /Estimated/

Regulatory Data

OSHA PEL
25 110 25 ppm (ST) 40 ppm
NIOSH REL
TWA 25 ppm (105 mg/m 3 ) ST 40 ppm (170 mg/m 3 )
IDLH
500 ppm

Special Provisions

49 CFR 172.102 special provision codes for this entry: IB9. 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.