UN/NA Number Reference
DOT Class 2.1 Flammable Gas placard

UN 1032: Dimethylamine, anhydrous

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1032 is assigned the proper shipping name Dimethylamine, anhydrous in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 2.1 Flammable Gas material. Required label(s): 2.1.

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 118)

Hazards: Flammable. May be ignited by heat, sparks, flames. Corrosive. Causes burns to skin and eyes.

Fire: Use dry chemical, CO2, or water spray. Do not use water jet. Cool containers with flooding water.

Spill: Stop leak if safe. Use water spray to reduce vapor. Prevent runoff to waterways.

Chemical and Physical Properties

Dimethylamine, anhydrous appears as a colorless gas smelling of fish at low concentrations and of ammonia at higher concentrations. Shipped as a liquid under its vapor pressure. Contact with the unconfined liquid can cause frostbite by evaporative cooling and chemical type burns. The gas, which is corrosive, dissolves readily in water to form flammable corrosive solutions. The gas is heavier than air and can asphyxiate by the displacement of air. Gas is easily ignited and produces toxic oxides of nitrogen when burned. Long-term inhalation of low concentrations or short-term inhalation of low concentrations has adverse health effects. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket. Used to make other chemicals and as a solvent.

CAS Number: 124-40-3
Molecular Formula: C2H7N
Molecular Weight: 45.08 g/mol
Color / Form: Colorless gas
Odor: ... Ammonia or fish-like odor ...
Boiling Point: 45.3 F
Melting Point: -135 °F (NTP, 1992)
Flash Point: 20 F
Autoignition: 756 °F (USCG, 1999)
Specific Gravity: 0.671 (floats on water)
Vapor Pressure: 1388.03 mmHg at 70 F
Vapor Density: 1.6 (heavier than air)
Water Solubility: 24 % at 140 F
Log P: log Kow = -0.38
pH: Aqueous solutions of dimethylamine are highly alkaline, like ammonia

Regulatory Data

CERCLA RQ (40 CFR 302.4)
1000 lb
OSHA PEL
TWA 10 ppm (18 mg/m 3 )
NIOSH REL
TWA 10 ppm (18 mg/m 3 )
IDLH
500 ppm
RCRA Waste Code(s)
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A release of this material at or above its CERCLA reportable quantity (1000 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: N87, T50. 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 1032 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.