UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1541: Acetone cyanohydrin, stabilized

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1541 is assigned the proper shipping name Acetone cyanohydrin, stabilized 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 I. Required label(s): 6.1, 3.

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 155)

Hazards: TOXIC. Corrosive. Flammable or water-reactive. Produces toxic gases on water contact.

Fire: DO NOT use water unless no alternative. Dry chemical, CO2.

Spill: Do not touch. Keep dry. Use water spray with caution.

Chemical and Physical Properties

Acetone cyanohydrin, stabilized appears as a colorless liquid. Flash point 165 °F. Lethal by inhalation and highly toxic or lethal by skin absorption. Density 7.8 lb / gal (less dense than water). Vapors heavier than air. Produces toxic oxides of nitrogen during combustion.

CAS Number: 75-86-5
Molecular Formula: C4H7NO
Molecular Weight: 85.10 g/mol
Color / Form: Colorless liquid
Odor: Distinct strong cyanide odor
Boiling Point: 180 F
Melting Point: -2.2 °F (EPA, 1998)
Flash Point: 165 F
Autoignition: 1270 °F (USCG, 1999)
Specific Gravity: 0.9267 (floats on water)
Vapor Pressure: 0.8 mmHg at 68 F
Vapor Density: 2.93 (heavier than air)
Water Solubility: greater than or equal to 100 mg/mL at 68 F

Regulatory Data

CERCLA RQ (40 CFR 302.4)
10 lb
EPCRA TPQ (40 CFR 355)
1000 lb
OSHA PEL
none
NIOSH REL
C 1 ppm (4 mg/m 3 ) [15-minute]
IDLH
N
RCRA Waste Code(s)
[object Object]

A release of this material at or above its CERCLA reportable quantity (10 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: 2, B9, B14, B32, B76, B77, N34, T20, TP2, TP13, TP38, TP45. 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 1541 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.