UN/NA Number Reference
DOT Class 2.2 Non-Flammable Gas placard

UN 1984: Trifluoromethane

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1984 is assigned the proper shipping name Trifluoromethane in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 2.2 Non-Flammable Gas material. Required label(s): 2.2.

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 126)

Hazards: May cause asphyxiation. May cause frostbite. Containers may rocket.

Fire: Let fire burn unless leak can be stopped. Cool surrounding containers with water.

Spill: Stop leak if safe. Ventilate area. Prevent gas from entering low areas.

Chemical and Physical Properties

Trifluoromethane is a colorless nonflammable gas. It is shipped as a liquid under pressure. It may be narcotic in high concentrations. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. It is used as a refrigerant.

CAS Number: 75-46-7
Molecular Formula: CHF3
Molecular Weight: 70.014 g/mol
Color / Form: Colorless gas
Odor: Odorless
Boiling Point: -82.0 C
Melting Point: -155.18 °C
Specific Gravity: 0.673 g/cu cm
Vapor Pressure: 35300.0 [mmHg]
Vapor Density: 2.4 (heavier than air)
Water Solubility: In water, 4.09X10+3 mg/L at 25 C
Log P: log Kow = 0.64

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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.