UN/NA Number Reference
DOT Class 2.3 Toxic Gas placard

UN 3523: Germane, adsorbed

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 3523 is assigned the proper shipping name Germane, adsorbed 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, 2.1.

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 119)

Hazards: TOXIC. May be fatal if inhaled or absorbed through skin. Flammable. Vapors heavier than air.

Fire: Small: dry chemical or CO2. Large: water spray or fog. Fight from maximum distance.

Spill: Do not touch. Stop leak if safe. Use water spray to reduce vapor.

Chemical and Physical Properties

Germane is a colorless gas with a pungent odor. It is flammable. The gas is heavier than air and a flame can flash back to the source of leak very easily. It is toxic by inhalation. Prolonged exposure of the containers to fire or intense heat may result in their violent rupturing and rocketing. It is used in making electronics.

CAS Number: 7782-65-2
Molecular Formula: GeH4
Molecular Weight: 76.66 g/mol
Color / Form: Colorless gas
Odor: Pungent
Boiling Point: -127 F
Melting Point: -267 °F (NIOSH, 2024)
Flash Point: Flammable gas
Specific Gravity: 3.133 (sinks in water)
Vapor Pressure: 1 atm
Vapor Density: 2.65 (heavier than air)
Water Solubility: Insoluble in water

Regulatory Data

OSHA PEL
none
NIOSH REL
TWA 0.2 ppm (0.6 mg/m 3 )
IDLH
N

Special Provisions

49 CFR 172.102 special provision codes for this entry: 2. 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 3523 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.