UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1600: Dinitrotoluenes, molten

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1600 is assigned the proper shipping name Dinitrotoluenes, molten 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 152)

Hazards: TOXIC. Combustible. May be ignited by heat, sparks. Toxic fumes when burned.

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

Spill: Do not touch. Eliminate ignition sources. Ventilate area. Use water spray.

Chemical and Physical Properties

Styrene monomer, stabilized appears as a clear colorless to dark liquid with an aromatic odor. Vapors heavier than air and irritating to the eyes and mucous membranes. Subject to polymerization. If the polymerization takes place inside a closed container, the container may rupture violently. Less dense than water and insoluble in water. Used to make plastics, paints, and synthetic rubber.

CAS Number: 100-42-5
Molecular Formula: C8H8
Molecular Weight: Variable g/mol
Color / Form: Colorless to yellowish, oily liquid
Odor: Characteristic, sweet, balsamic, almost floral odor that is extremely penetrating
Boiling Point: Variable
Melting Point: -24 to -23 °F (NTP, 1992)
Flash Point: Variable
Autoignition: 914 °F (USCG, 1999)
Specific Gravity: Variable
Vapor Pressure: 4.3 mmHg at 59 °F ; 9.5 mmHg at 86 °F; 10 mmHg at 95 °F (NTP, 1992)
Vapor Density: 3.6 (Air = 1)
Water Solubility: Variable
Log P: log Kow = 2.95

Regulatory Data

CERCLA RQ (40 CFR 302.4)
1000 lb
OSHA PEL
TWA 100 ppm C 200 ppm 600 ppm (5-minute maximum peak in any 3 hours)
NIOSH REL
TWA 50 ppm (215 mg/m 3 ) ST 100 ppm (425 mg/m 3 )
IDLH
700 ppm

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: T7, TP3. 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 1600 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.