UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 3452: Xylidines, solid

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 3452 is assigned the proper shipping name Xylidines, solid 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 II. 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 153)

Hazards: TOXIC. Combustible. Corrosive. Causes burns. Toxic fumes when heated.

Fire: Small: dry chemical, CO2, water spray. Large: water spray, foam.

Spill: Do not touch. Stop leak if safe. Use water spray to reduce vapor.

Chemical and Physical Properties

Xylidines is a pale-yellow to brown liquid with a weak, aromatic, amine-like odor. (NIOSH, 2024)

CAS Number: 1300-73-8
Molecular Formula: C48H66N6
Molecular Weight: 727.1 g/mol
Color / Form: Pale yellow to a brown liquid.
Odor: Weak aromatic amine odor
Boiling Point: 439 F
Melting Point: -33 °F (NIOSH, 2024)
Flash Point: 206 F
Autoignition: 520-590 °C
Specific Gravity: 0.98
Vapor Pressure: 1 mmHg
Vapor Density: 4.17 (heavier than air)
Water Solubility: Slight (NIOSH, 2024)
Log P: 1.8-2.2 (estimated)

Regulatory Data

OSHA PEL
TWA 5 ppm (25 mg/m 3 ) [skin]
NIOSH REL
TWA 2 ppm (10 mg/m 3 ) [skin]
IDLH
50 ppm

Special Provisions

49 CFR 172.102 special provision codes for this entry: IB8, IP2, IP4, T3, TP33. 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 3452 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.