UN/NA Number Reference
DOT Class 8 Corrosive placard

UN 2803: Gallium

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2803 is assigned the proper shipping name Gallium in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 8 Corrosive material, Packing Group III. Required label(s): 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 154)

Hazards: TOXIC. Corrosive. Non-combustible but may decompose producing toxic fumes when heated.

Fire: Use agent appropriate for surrounding fire. Cool containers.

Spill: Do not touch. Avoid inhalation. Use water spray to reduce fumes.

Chemical and Physical Properties

Gallium is a silvery-white liquid or a soft, malleable solid at room temperature. Ingestion of this material may be toxic. It is corrosive to aluminum. If exposed to high temperatures, gallium may emit toxic fumes which may form a corrosive alkaline solution with water. It is soluble in most acids and alkalis. It is used as a semiconductor material.

CAS Number: 7440-55-3
Molecular Formula: Ga
Molecular Weight: 69.723 g/mol
Color / Form: Grayish metal, possesses a greenish-blue reflection or silver-like when molten; has a crystalline ortho-rhombic texture
Boiling Point: 4352 F
Melting Point: 29.78 °C
Specific Gravity: 6.0947 @ 29.8 C (liquid)
Vapor Pressure: 1 Pa @ 1037 C
Water Solubility: Sol in acid, alkali

Special Provisions

49 CFR 172.102 special provision codes for this entry: T1, TP33. 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 2803 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.