UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 2727: Thallium nitrate

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2727 is assigned the proper shipping name Thallium nitrate 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 II. Required label(s): 6.1, 5.1.

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 141)

Hazards: Oxidizer. TOXIC. May be fatal if inhaled or swallowed. Accelerates combustion.

Fire: Use flooding water. Do not use dry chemical, foam.

Spill: Do not touch. Keep combustibles away. Use water spray.

Chemical and Physical Properties

Thallium nitrate appears as a colorless crystalline solid melting at 206 °C. Toxic by ingestion and skin absorption. Used to make other chemicals.

CAS Number: 10102-45-1
Molecular Formula: NO3Tl
Molecular Weight: 266.39 g/mol
Color / Form: WHITE CRYSTALS
Odor: Odorless
Boiling Point: 806 F
Melting Point: 403 °F (NTP, 1992)
Specific Gravity: 5.556 (sinks in water)
Water Solubility: Alpha isomer: 9.55 g Sol in 100 cc cold water at 20 C, 4.13 g/100 cc hot water at 100 C, insol in alc, sol in acetone. G

Regulatory Data

CERCLA RQ (40 CFR 302.4)
100 lb
RCRA Waste Code(s)
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A release of this material at or above its CERCLA reportable quantity (100 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: IB6, IP2, T3, 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 2727 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.