UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 1194: Ethyl nitrite solution

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1194 is assigned the proper shipping name Ethyl nitrite solution in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 3 Flammable Liquid material, Packing Group I. Required label(s): 3, 6.1.

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

Ethyl nitrite, solution appears as a clear colorless to yellow liquid with a pleasant odor. Flammable over a wide range of vapor-air concentrations. Flash point -31 °F. Less dense than water and insoluble in water. Vapors are heavier than air and narcotic in high concentrations. Produces toxic oxides of nitrogen during combustion.

CAS Number: 109-95-5
Molecular Formula: C2H5NO2
Molecular Weight: 75.07 g/mol
Color / Form: Colorless or yellowish, clear liquid
Odor: SWEET, RUM-LIKE ODOR
Boiling Point: 63 °F at 760 mmHg (USCG, 1999)
Melting Point: -58 °F (USCG, 1999)
Flash Point: -31 °F (USCG, 1999)
Autoignition: 194 °F (USCG, 1999)
Specific Gravity: 0.9 at 59 °F (USCG, 1999) - Less dense than water; will float
Vapor Pressure: 620.0 [mmHg]
Vapor Density: 2.6
Water Solubility: Slightly soluble in water; decomposes in water; miscible with alcohol, ether

Need the full interactive record? Open UN 1194 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.