UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 3414: Sodium cyanide, solution

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 3414 is assigned the proper shipping name Sodium cyanide, 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 I. 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 157)

Hazards: TOXIC and/or CORROSIVE. Reacts with water. Non-combustible in themselves.

Fire: DO NOT use water. Dry chemical, CO2, dry sand.

Spill: Do not touch. Keep material dry.

Chemical and Physical Properties

Sodium cyanide appears as a white crystalline solid, lump solid or powder. A deadly human poison by ingestion. Toxic by skin absorption through open wounds, by ingestion, and by inhalation of dust.

CAS Number: 143-33-9
Molecular Formula: CNNa
Molecular Weight: 49.007 g/mol
Color / Form: White cubic crystals
Odor: Odorless when perfectly dry, emits odor of hydrogen cyanide when damp
Boiling Point: 2725 °F at 760 mmHg (EPA, 1998)
Melting Point: 1047 °F (EPA, 1998)
Flash Point: Not combustible (EPA, 1998)
Autoignition: Not flammable (USCG, 1999)
Specific Gravity: 1.6 at 77 °F (USCG, 1999) - Denser than water; will sink
Vapor Pressure: 1 mmHg at 1502.6 °F (EPA, 1998)
Water Solubility: greater than or equal to 100 mg/mL at 68 °F (NTP, 1992)
pH: Aq soln strongly alkaline

Regulatory Data

CERCLA RQ (40 CFR 302.4)
10 lb
EPCRA TPQ (40 CFR 355)
100 lb
OSHA PEL
TWA 5 mg/m 3 [*Note: The PEL also applies to other cyanides (as CN) except Hydrogen cyanide.]
NIOSH REL
C 5 mg/m 3 (4.7 ppm) [10-minute] [*Note: The REL also applies to other cyanides (as CN) except Hydrogen cyanide.]
IDLH
25 mg/m 3 (as CN)
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: B69, B77, N74, N75, T14, TP2, TP13, W31. 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 3414 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.