UN/NA Number Reference
DOT Class 3 Flammable Liquid placard

UN 2687: Dicyclopentadiene

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2687 is assigned the proper shipping name Dicyclopentadiene in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 3 Flammable Liquid material, Packing Group III. Required label(s): 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 130)

Hazards: Flammable. Toxic vapor. Harmful if inhaled or absorbed. May accumulate in low areas.

Fire: Dry chemical, CO2, foam, water spray. Do not use straight streams.

Spill: Eliminate ignition sources. Stop leak. Absorb with sand/earth. Prevent waterway contamination.

Chemical and Physical Properties

Dicyclopentadiene appears as a liquid with an acrid odor. Flash point 90 °F. The vapors are irritating to the eyes and respiratory system. Subject to polymerization if subjected to heat for prolonged periods or if contaminated. If the polymerization takes place inside a container, the container may violently rupture. Insoluble in water. Density 8.2 lb / gal. Used in paints, varnishes, as an intermediate in insecticides, as a flame retardant in plastics.

CAS Number: 77-73-6
Molecular Formula: C10H12
Molecular Weight: 132.20 g/mol
Color / Form: Colorless crystalline solid [Note: A liquid above 90 degrees F]
Odor: Disagreeable camphor-like odor
Boiling Point: 342 F
Melting Point: 92.5 °F (NTP, 1992)
Flash Point: 90 F
Autoignition: 941 °F (USCG, 1999)
Specific Gravity: 0.978 (floats on water)
Vapor Pressure: 10 mmHg at 117.7 F
Vapor Density: 4.55 (heavier than air)
Water Solubility: Insoluble
Log P: log Kow = 2.78

Regulatory Data

CERCLA RQ (40 CFR 302.4)
1 lb
OSHA PEL
none
NIOSH REL
TWA 5 ppm (30 mg/m 3 )
IDLH
N

A release of this material at or above its CERCLA reportable quantity (1 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: IB8, IP3, T1, TP33. 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 2687 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.