UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1750: Chloroacetic acid, solution

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1750 is assigned the proper shipping name Chloroacetic acid, solution 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, 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 153)

Hazards: TOXIC. Combustible. Corrosive. Causes burns. Toxic fumes when heated.

Fire: Small: dry chemical, CO2, water spray. Large: water spray, foam.

Spill: Do not touch. Stop leak if safe. Use water spray to reduce vapor.

Chemical and Physical Properties

Chloroacetic acid, solid is a colorless to light-brown crystalline material. It is soluble in water and sinks in water. Combustible. It is transported as a molten liquid and therefore can cause thermal burns. It is toxic by ingestion, skin absorption and inhalation of dust. It is corrosive to metals and tissue.

CAS Number: 79-11-8
Molecular Formula: C2H3ClO2
Molecular Weight: 94.50 g/mol
Color / Form: Monoclinic prisms
Odor: Strong vinegar-like odor
Boiling Point: 372°F (189°C)
Melting Point: 145 °F (EPA, 1998)
Flash Point: 259°F (126°C)
Autoignition: >932 °F (>500 °C)
Specific Gravity: 1.58 (sinks in water)
Vapor Pressure: 1 mmHg at 109.4 °F (EPA, 1998)
Vapor Density: 3.26 (heavier than air)
Water Solubility: Miscible (fully soluble)
Log P: log Kow = 0.22

Regulatory Data

CERCLA RQ (40 CFR 302.4)
100 lb
EPCRA TPQ (40 CFR 355)
100 lb

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: A7, IB2, N34, T7, TP2. 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 1750 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.