UN/NA Number Reference
DOT Class 2.3 Toxic Gas placard

UN 2195: Tellurium hexafluoride

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2195 is assigned the proper shipping name Tellurium hexafluoride in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 2.3 Toxic Gas material. Required label(s): 2.3, 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 123)

Hazards: TOXIC. May be fatal if inhaled. Corrosive to metals and tissue. Vapors heavier than air.

Fire: Small: dry chemical or CO2. Large: water spray or fog. Do not use water jet.

Spill: Fully encapsulating suit. Stop leak if safe. Use water spray to reduce vapor.

Chemical and Physical Properties

Tellurium hexafluoride is a colorless gas with a repulsive odor. It is very toxic by inhalation and skin absorption. When heated to high temperatures, it may emit toxic fluoride and tellurium fumes. It is heavier than air. Under prolonged exposure to fire or intense heat the containers may violently rupture and rocket. It reacts with water to yield toxic vapors.

CAS Number: 7783-80-4
Molecular Formula: F6Te
Molecular Weight: 241.6 g/mol
Color / Form: Colorless gas
Odor: Repulsive odor
Boiling Point: 95.9 F
Melting Point: -35.7 °F (EPA, 1998)
Specific Gravity: 2.499 @ -10 C /Liquid/
Vapor Pressure: Greater than 760 mmHg
Vapor Density: 2.499 (heavier than air)
Water Solubility: Decomposes

Regulatory Data

EPCRA TPQ (40 CFR 355)
100 lb
OSHA PEL
TWA 0.02 ppm (0.2 mg/m 3 )
NIOSH REL
TWA 0.02 ppm (0.2 mg/m 3 )
IDLH
1 ppm

Special Provisions

49 CFR 172.102 special provision codes for this entry: 1. 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.

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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.