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

UN 1021: 1-Chloro-1,2,2,2-tetrafluoroethane

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1021 is assigned the proper shipping name 1-Chloro-1,2,2,2-tetrafluoroethane 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

2-chloro-1,1,1,2-tetrafluoroethane is a colorless nonflammable gas. Nearly odorless.

CAS Number: 2837-89-0
Molecular Formula: C2HClF4
Molecular Weight: 136.47 g/mol
Color / Form: Colorless gas
Boiling Point: 13.6 F
Melting Point: -179 °F (USCG, 1999)
Autoignition: Not flammable (USCG, 1999)
Specific Gravity: 1.364 g/mL
Vapor Pressure: 385 kPa (2,888 mm Hg) at 25 C
Vapor Density: 4.7 (heavier than air)
Water Solubility: In water, 1.5X10+3 mg/L at 25 C

Special Provisions

49 CFR 172.102 special provision codes for this entry: 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 1021 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.