UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 2871: Antimony powder

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2871 is assigned the proper shipping name Antimony powder in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 6.1 Toxic Substance material, Packing Group III. Required label(s): 6.1.

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 170)

Hazards: Flammable. May react with water producing flammable hydrogen gas. May reignite after extinguishing.

Fire: DO NOT use water, foam, or CO2. Use dry sand, dry sodium chloride powder, or Met-L-X.

Spill: Do not touch. Cover with dry sand or earth. Keep dry. Do not use water.

Chemical and Physical Properties

Antimony powder appears as a silvery or gray solid in the form of dust. Denser than water and insoluble in water. Toxic by inhalation and by ingestion. May burn and emit toxic fumes if heated or exposed to flames. Used to make electric storage batteries and semiconductors.

CAS Number: 7440-36-0
Molecular Formula: Sb
Molecular Weight: 121.760 g/mol
Color / Form: Silver metal; hexagonal (gray antimony); black amorphous solid (black antimony)
Boiling Point: 3182 F
Melting Point: 1167.3 °F (NTP, 1992)
Specific Gravity: 6.684 (sinks in water)
Vapor Pressure: 1 mmHg at 1627 F
Water Solubility: Insoluble

Regulatory Data

CERCLA RQ (40 CFR 302.4)
5000 lb
OSHA PEL
TWA 0.5 mg/m 3 [*Note: The PEL also applies to other antimony compounds (as Sb).]
NIOSH REL
TWA 0.5 mg/m 3 [*Note: The REL also applies to other antimony compounds (as Sb).]
IDLH
50 mg/m 3 (as Sb)

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: IB8, IP3, 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 2871 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.