UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 2253: N,N-Dimethylaniline

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2253 is assigned the proper shipping name N,N-Dimethylaniline 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

N,n-dimethylaniline appears as a yellow to brown colored oily liquid with a fishlike odor. Less dense than water and insoluble in water. Flash point 150 °F. Toxic by ingestion, inhalation, and skin absorption. Used to make dyes and as a solvent.

CAS Number: 121-69-7
Molecular Formula: C8H11N
Molecular Weight: 121.18 g/mol
Color / Form: Pale-yellow, oily liquid [Note: A solid below 36 degrees F]
Odor: Amine-like odor
Boiling Point: 381 F
Melting Point: 36.4 °F (NTP, 1992)
Flash Point: 145 F
Autoignition: 700 °F (NTP, 1992)
Specific Gravity: 0.9557 (floats on water)
Vapor Pressure: 1 mmHg at 85.1 F
Vapor Density: 4.17 (heavier than air)
Water Solubility: less than 1 mg/mL at 70 F
Log P: log Kow = 2.31

Regulatory Data

CERCLA RQ (40 CFR 302.4)
100 lb
OSHA PEL
TWA 5 ppm (25 mg/m 3 ) [skin]
NIOSH REL
TWA 5 ppm (25 mg/m 3 ) ST 10 ppm (50 mg/m 3 ) [skin]
IDLH
100 ppm

A release of this material at or above its CERCLA reportable quantity (100 lb) requires immediate notification to the National Response Center at 800-424-8802.

Special Provisions

49 CFR 172.102 special provision codes for this entry: IB1, T7, TP2. 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 2253 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.