UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1163: Dimethylhydrazine, unsymmetrical

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1163 is assigned the proper shipping name Dimethylhydrazine, unsymmetrical 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 I. Required label(s): 6.1, 3, 8.

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 131)

Hazards: HIGHLY FLAMMABLE. TOXIC. May be fatal if inhaled, swallowed, or absorbed through skin. Vapors heavier than air.

Fire: Small: dry chemical, CO2, water spray, alcohol-resistant foam. Large: water spray, fog, alcohol-resistant foam.

Spill: Eliminate ignition sources. Do not touch. Stop leak if safe. Use vapor-suppressing foam. Ventilate area.

Chemical and Physical Properties

1,1-dimethylhydrazine appears as a clear colorless liquid with an ammonia-like odor. Flash point 0 °F. Corrosive to the skin. Less dense than water and soluble in water. Vapors are heavier than air and very toxic by inhalation, attacking the eyes and respiratory system. Prolonged exposure of containers to heat may result in their violent rupturing and rocketing due to decomposition. Generates toxic oxides of nitrogen when burned. Vapors may travel to a source of ignition and a flame can flashback to the source of vapors. Used as a rocket propellant and to make other chemicals.

CAS Number: 57-14-7
Molecular Formula: C2H8N2
Molecular Weight: 60.10 g/mol
Color / Form: CLEAR, COLORLESS LIQUID
Odor: Characteristic ammonia like fishy odor of aliphatic hydrazines
Boiling Point: 147 F
Melting Point: -72 °F (EPA, 1998)
Flash Point: 5 F
Autoignition: 480 °F (NTP, 1992)
Specific Gravity: 0.7914 (floats on water)
Vapor Pressure: 157 mmHg at 77 F
Vapor Density: 1.94 (heavier than air)
Water Solubility: Decomposes
Log P: log Kow = -1.19 /Estimated/
pH: STRONGLY ALKALINE LIQ

Regulatory Data

CERCLA RQ (40 CFR 302.4)
10 lb
EPCRA TPQ (40 CFR 355)
1000 lb
OSHA PEL
TWA 0.5 ppm (1 mg/m 3 ) [skin]
NIOSH REL
Ca C 0.06 ppm (0.15 mg/m 3 ) [2-hr]
IDLH
Ca [15 ppm]
RCRA Waste Code(s)
[object Object]

A release of this material at or above its CERCLA reportable quantity (10 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: 2, B7, B9, B14, B32, T20, TP2, TP13, TP38, TP45. 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 1163 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.