UN/NA Number Reference
DOT Class 5.1 Oxidizer placard

UN 2468: Trichloroisocyanuric acid, dry

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2468 is assigned the proper shipping name Trichloroisocyanuric acid, dry in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 5.1 Oxidizer material, Packing Group II. Required label(s): 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 140)

Hazards: May cause fire or explosion. May accelerate burning. May explode from heat or contamination.

Fire: Use flooding water. Cool containers. Do not use dry chemical on large fires (ineffective).

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

Chemical and Physical Properties

Trichloro-s-triazinetrione, dry appears as a white slightly hygroscopic crystalline powder or lump solid with a mild chlorine-like odor. Said to have 85 percent available chlorine. Decomposes at 225 °C. Moderately toxic by ingestion. May irritate skin and eyes. Active ingredient in household dry bleaches. Used in swimming pools as a disinfectant.

CAS Number: 10028-22-5
Molecular Formula: C3Cl3N3O3
Molecular Weight: 232.41 g/mol
Color / Form: Needles from ethylene chloride
Odor: Chlorine odor
Boiling Point: The Anhydrous form decomposes (480ºC)
Melting Point: 246.7 °C (decomposes)
Flash Point: > 250 C (482 F ) open cup
Specific Gravity: greater than 1
Vapor Pressure: 0.00000012 [mmHg]
Water Solubility: Soluble in chlorinated and highly polar solvents
Log P: 0.26
pH: pH = 4.4

Regulatory Data

CERCLA RQ (40 CFR 302.4)
1000 lb

A release of this material at or above its CERCLA reportable quantity (1000 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, IP2, IP4, 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.

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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.