UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1593: Dichloromethane

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1593 is assigned the proper shipping name Dichloromethane 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 III. 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 160)

Hazards: Non-flammable in most cases. Toxic by inhalation. Vapors heavier than air. Decomposes in fire producing toxic gases including phosgene.

Fire: Use water spray, dry chemical, CO2, foam.

Spill: Ventilate area. Absorb with earth/sand. Prevent runoff to waterways.

Chemical and Physical Properties

Dichloromethane appears as a colorless liquid with a sweet, penetrating, ether-like odor. Noncombustible by if exposed to high temperatures may emit toxic chloride fumes. Vapors are narcotic in high concentrations. Used as a solvent and paint remover.

CAS Number: 75-09-2
Molecular Formula: CH2Cl2
Molecular Weight: 84.93 g/mol
Color / Form: Colorless liquid [Note: A gas above 104 degrees F]
Odor: Sweet, pleasant odor, like chloroform
Boiling Point: 103.6 F
Melting Point: -142.1 °F (NTP, 1992)
Autoignition: 1184 °F (USCG, 1999)
Specific Gravity: 1.322 (sinks in water)
Vapor Pressure: 440 mmHg at 77 F
Vapor Density: 2.93 (heavier than air)
Water Solubility: 10 to 50 mg/mL at 70 F
Log P: log Kow = 1.25

Regulatory Data

CERCLA RQ (40 CFR 302.4)
1000 lb
OSHA PEL
See Annotated Z-2 See Annotated Z-2
NIOSH REL
Ca
IDLH
Ca [2300 ppm]
RCRA Waste Code(s)
[object Object]

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: IB3, IP8, N36, 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 1593 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.