UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 2525: Ethyl oxalate

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2525 is assigned the proper shipping name Ethyl oxalate in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 6.1 Toxic Substance material, Packing Group III. Required label(s): 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 160)

Hazards: Non-flammable in most cases. Toxic by inhalation. Vapors heavier than air. Decomposes in fire producing toxic gases including phosgene.

Fire: Use water spray, dry chemical, CO2, foam.

Spill: Ventilate area. Absorb with earth/sand. Prevent runoff to waterways.

Chemical and Physical Properties

Ethyl oxalate appears as a colorless liquid. Slightly denser than water and insoluble in water. Hence sinks in water. May irritate skin and mucous membranes; may be mildly toxic by ingestion; may emit irritating fumes in a fire. Vapors are much heavier than air. Used as a solvent for plastics and in the manufacture of perfumes and pharmaceuticals.

CAS Number: 95-92-1
Molecular Formula: C6H10O4
Molecular Weight: 146.14 g/mol
Color / Form: COLORLESS, OILY LIQUID
Odor: AROMATIC ODOR
Boiling Point: 185.7 C @ 760 MM HG
Melting Point: -38.5 °C
Flash Point: 168 F
Specific Gravity: 1.0785 @ 20 C/4 C
Vapor Pressure: 0.41 [mmHg]
Vapor Density: 5.04 (heavier than air)
Water Solubility: SPARINGLY SOL IN WATER WHICH DECOMP IT GRADUALLY

Special Provisions

49 CFR 172.102 special provision codes for this entry: IB3, T4, 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 2525 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.