UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 3411: beta-Naphthylamine, solution

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 3411 is assigned the proper shipping name beta-Naphthylamine, 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.

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

Beta-naphthylamine appears as a white to reddish colored solid in the form of flakes. Slightly soluble in hot water and denser than water. Toxic by ingestion, inhalation and skin absorption. Used to make dyes and agricultural chemicals.

CAS Number: 91-59-8
Molecular Formula: C10H9N
Molecular Weight: 143.18 g/mol
Color / Form: COLORLESS CRYSTALS WHICH DARKEN IN AIR TO A REDDISH-PURPLE COLOR
Odor: Faint aromatic odor
Boiling Point: 583 °F at 760 mmHg (NTP, 1992)
Melting Point: 232 to 235 °F (NTP, 1992)
Flash Point: 315 °F (NIOSH, 2024)
Specific Gravity: 1.061 at 208 °F (NTP, 1992) - Denser than water; will sink
Vapor Pressure: 1 mmHg at 226.4 °F ; 5 mmHg at 286.9 °F (NTP, 1992)
Vapor Density: 4.95 (NTP, 1992) - Heavier than air; will sink (Relative to Air)
Water Solubility: less than 1 mg/mL at 72 °F (NTP, 1992)
Log P: log Kow =2.28
pH: WEAK BASE

Regulatory Data

CERCLA RQ (40 CFR 302.4)
10 lb
OSHA PEL
See Section 5209
NIOSH REL
Ca
IDLH
Ca [N
RCRA Waste Code(s)
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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: IB2, 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 3411 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.