Dicyclopentadiene

CAS: 77-73-6

Overview

Dicyclopentadiene (CAS 77-73-6 ) is a cyclic diene monomer derived from the dimerization of cyclopentadiene. It serves as a reactive building block in resin and polymer synthesis across several industrial sectors.

In unsaturated polyester resins, DCPD is incorporated to reduce styrene content, improve surface quality, and lower resin cost. This makes it a standard raw material for fiberglass composites used in automotive and construction panels.

Hydrocarbon resin manufacturers use DCPD as a primary feedstock to produce C5/C9 resins applied in hot-melt adhesives, road-marking paints, and printing inks. These resins provide excellent tack and stability.

In the coatings and ink industry, DCPD-based resins contribute to fast-drying, high-gloss formulations for publication and packaging printing. It also functions as a monomer in ring-opening metathesis polymerization.

This process produces polydicyclopentadiene, a high-impact engineering material used in structural and industrial molded parts. The material is valued for its durability and resistance to chemical degradation.

DCPD is supplied as a liquid or solid depending on purity grade, with high-purity grades typically 95% and 99% available for polymer and specialty resin applications. Technical-grade material is standard for large-volume use.

It is commonly traded in bulk quantities, with drum and ISO tank packaging available for industrial buyers. Our supply chain ensures consistent quality and reliable delivery for all manufacturing requirements.

Physical Properties

Melting Point	32 °C
Boiling Point	64-65 °C @ Press: 14 Torr
Density	0.9302 g/cm³ @ Temp: 35 °C
Flash Point	114 °F
Appearance	Cyclopentadiene is a crystalline solid or a liquid (above 32°C) with a disagreeable, camphor-like odor. The Odor Threshold is 0.011 (detectable); 0.020 ppm (recognizable).
Color	Clear
Odor	Camphor-like.
Form	Liquid
Water Solubility	Immiscible with water.
Vapor Pressure	3 hPa (20 °C)
Refractive Index	n 20/D 1.511
Log P	3.300 (est)

Safety & Handling

Danger GHS02 GHS07 GHS09 GHS06 GHS08 Hazard Statements H225 Highly Flammable liquid and vapor H226 Flammable liquid and vapor H228 Flammable solid H302 Harmful if swallowed H304 May be fatal if swallowed and enters airways H313 May be harmful in contact with skin H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H320 Causes eye irritation H330 Fatal if inhaled H332 Harmful if inhaled H335 May cause respiratory irritation H336 May cause drowsiness or dizziness H351 Suspected of causing cancer H361 Suspected of damaging fertility or the unborn child H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H401 Toxic to aquatic life H411 Toxic to aquatic life with long lasting effects H412 Harmful to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P233 Keep container tightly closed. P240 Ground and bond container and receiving equipment. P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment. P242 Use non-sparking tools. P243 Take action to prevent static discharges. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P320 Specific treatment is urgent (see … on this label). P321 Specific treatment (see … on this label). P330 Rinse mouth. P331 Do NOT induce vomiting. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P301+P317 Get emergency medical help. P302+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P403+P235 Store in a well-ventilated place. Keep cool. P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code	29021990
UN Number	2048
ADR Class	3
Packing Group	III
Storage Class	3 - Flammable liquids
WGK (Germany)	3

Other Names

Industries

Printing & Packaging Plastics & Polymers Personal Care & Cosmetics