UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 2528: Isobutyl isobutyrate

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2528 is assigned the proper shipping name Isobutyl isobutyrate 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 130)

Hazards: Flammable. Toxic vapor. Harmful if inhaled or absorbed. May accumulate in low areas.

Fire: Dry chemical, CO2, foam, water spray. Do not use straight streams.

Spill: Eliminate ignition sources. Stop leak. Absorb with sand/earth. Prevent waterway contamination.

Chemical and Physical Properties

Isobutyl isobutyrate appears as a colorless liquid with a pleasant fruity odor. Moderately toxic by inhalation. Insoluble in water and floats on water, but soluble in alcohol and ethers. It is used as a flavoring and in the manufacture of insecticides.

CAS Number: 97-85-8
Molecular Formula: C8H16O2
Molecular Weight: 144.21 g/mol
Color / Form: COLORLESS LIQUID
Odor: FRUITY ODOR
Boiling Point: 299.7 F
Melting Point: -113.3 °F (USCG, 1999)
Flash Point: 99 F
Autoignition: 810 °F (432 °C)
Specific Gravity: 0.853 to 0.857
Vapor Pressure: 4.33 [mmHg]
Vapor Density: 4.97 (heavier than air)
Water Solubility: 0.5 G PER 100 ML WATER

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 2528 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.

Check the source: Current DOT Hazardous Materials Table · Official Emergency Response Guidebook. This compiled record is not a shipment classification or a complete response procedure.