UN/NA Number Reference
DOT Class 2.1 Flammable Gas placard

UN 1061: Methylamine, anhydrous

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1061 is assigned the proper shipping name Methylamine, 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

Methylamine, anhydrous appears as a colorless gas or a liquid. Pungent fishy odor resembling odor of ammonia. The liquid boils at cold temperatures, hence it vaporizes rapidly when unconfined. Vapors are heavier than air and may collect in low-lying areas. Easily ignited under most conditions. Under prolonged exposure to intense heat the containers may rupture violently and rocket. Used for making pharmaceuticals, insecticides, paint removers, surfactants, rubber chemicals.

CAS Number: 74-89-5
Molecular Formula: CH5N
Molecular Weight: 31.057 g/mol
Color / Form: Colorless gas [Note: A liquid below 21 degrees F. Shipped as a liquefied compressed gas]
Odor: Fish or ammonia-like odor
Boiling Point: 20.3 F
Melting Point: -134.5 °F (USCG, 1999)
Flash Point: 14 F
Autoignition: 806 °F (USCG, 1999)
Specific Gravity: 0.693 (floats on water)
Vapor Pressure: 1972.92 mmHg at 60 F
Vapor Density: 1.1 (heavier than air)
Water Solubility: greater than or equal to 100 mg/mL at 70 F
Log P: -0.57
pH: Stronger base than ammonia

Regulatory Data

CERCLA RQ (40 CFR 302.4)
100 lb
OSHA PEL
TWA 10 ppm (12 mg/m 3 )
NIOSH REL
TWA 10 ppm (12 mg/m 3 )
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: 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 1061 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.