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

UN 1028: Dichlorodifluoromethane

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1028 is assigned the proper shipping name Dichlorodifluoromethane 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

Dichlorodifluoromethane appears as a colorless gas having a faint ethereal odor. Shipped as a liquid confined under its own vapor pressure. Contact with the unconfined liquid can cause frostbite. Both components are noncombustible. Can asphyxiate by the displacement of air. Exposure of the closed container to prolonged heat or fire can cause it to rupture violently and rocket.

CAS Number: 75-71-8
Molecular Formula: CCl2F2
Molecular Weight: 120.91 g/mol
Color / Form: Colorless gas ... [Note: Shipped as a liquified compressed gas]
Odor: Practically odorless ... faint, ether-like odor in high concentration
Boiling Point: -21.6 F
Melting Point: -252 °F (NTP, 1992)
Autoignition: Not flammable (USCG, 1999)
Specific Gravity: 1.35 (sinks in water)
Vapor Pressure: 5 atm at 61 F
Vapor Density: 4.2 (heavier than air)
Water Solubility: Insoluble
Log P: log Kow = 2.16

Regulatory Data

CERCLA RQ (40 CFR 302.4)
5000 lb
OSHA PEL
1000 4950 1000 ppm (C) 6200 ppm
NIOSH REL
TWA 1000 ppm (4950 mg/m 3 )
IDLH
15,000 ppm
RCRA Waste Code(s)
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A release of this material at or above its CERCLA reportable quantity (5000 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: 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 1028 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.