UN/NA Number Reference
DOT Class 2.3 Toxic Gas placard

UN 2676: Stibine

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2676 is assigned the proper shipping name Stibine 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

Stibine appears as a colorless gas with a disagreeable odor. A moderate fire hazard that may yield toxic fumes when heated above 392 °F. Irritating to skin, eyes, and mucous membranes. Heavier than air. If exposed to prolonged fire or intense heat, the container may rupture violently or rocket.

CAS Number: 7803-52-3
Molecular Formula: H3Sb
Molecular Weight: 124.784 g/mol
Color / Form: Colorless gas
Odor: Disagreeable
Boiling Point: -1 F
Melting Point: -126 °F (NIOSH, 2024)
Flash Point: Flammable gas
Specific Gravity: 5.100 g/L
Vapor Pressure: greater than 1 atm
Vapor Density: 4.31 (heavier than air)
Water Solubility: Slight

Regulatory Data

OSHA PEL
TWA 0.1 ppm (0.5 mg/m 3 )
NIOSH REL
TWA 0.1 ppm (0.5 mg/m 3 )
IDLH
5 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.

Need the full interactive record? Open UN 2676 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.