Dicyclopentadiene (DCPD)

Name: Dicyclopentadiene (DCPD)
Brand: Royalchem
Rating: 5.0 (98 reviews)

CAS NO. 77-73-6

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Model:
High Purity Grade ≥99%
Brand:
Royalchem
Code:
77-73-6

Product Description

Product Name	Dicyclopentadiene (DCPD) (Synonyms: Cyclopentadiene Dimer; Bicyclopentadiene; 3a,4,7,7a-Tetrahydro-4,7-methano-1H-indene)
CAS NO.	77-73-6
Formula & Weight	C₁₀H₁₂ (MW: 132.20) \| EC: 201-052-9 \| MDL: MFCD00078246
Chemical Structure
Typical Specifications	Royalchem current high-purity typical specification; actual batch COA prevails Appearance: Colorless to pale yellow clear liquid or crystalline solid depending on temperature DCPD Assay (GC): ≥ 99.0% Color (Pt-Co): ≤ 30 Water: ≤ 0.03% Trimer & Co-dimers: ≤ 1.0%
Reference Properties	Melting Point: Approx. 32–33 °C Boiling Point: Approx. 167–170 °C Specific Gravity: Approx. 0.98 in the liquid state Refractive Index: Approx. 1.51 Water Solubility: Insoluble / very slightly soluble in water Odor: Characteristic strong camphor-like odor Reactivity: Reactive cyclic olefin capable of addition and metathesis polymerization; it can also thermally crack to cyclopentadiene.
Key Applications	Dicyclopentadiene is an importantcyclic olefin feedstock for resin, polymer and specialty chemical manufacturing. PDCPD / Reaction Injection Molding (RIM):High-purity DCPD is used as the monomer for polydicyclopentadiene (PDCPD). Through ring-opening metathesis polymerization, low-viscosity DCPD can be converted rapidly into tough thermoset components, making it suitable for RIM production of large and complex molded parts. Unsaturated Polyester Resins (UPR):DCPD is an established raw material for DCPD-modified unsaturated polyester resins used in composites, FRP and other thermoset resin applications. Hydrocarbon Resins:DCPD is widely used as a feedstock for DCPD-based and modified hydrocarbon resins. These resin systems can be used in adhesives, coatings, inks and related specialty formulations. EPDM Elastomers:DCPD is one of the diene third-monomer options used in ethylene-propylene-diene rubber, providing residual unsaturation for subsequent crosslinking. Other commercial diene monomers such as ENB are also used depending on the EPDM grade. Cyclic Olefin & Specialty Chemical Intermediates:DCPD can be thermally cracked to cyclopentadiene, which is an important starting material for norbornene derivatives, metallocene chemistry and other specialty cyclic olefin intermediates. DCPD-derived chemistry is also used in materials for optical and specialty polymer applications. Fine Chemical Synthesis:Hydrogenation of DCPD followed by rearrangement provides a documented synthetic route to adamantane. DCPD and its cyclopentadiene derivatives are also used in agrochemical, fragrance and other fine-chemical intermediate production.
Packaging & Storage	Packaging:Commercial steel drum, tank or other approved packaging according to grade, order quantity and dangerous-goods transport requirements. Storage:Keep containers tightly closed under controlled conditions in a cool, well-ventilated area away from heat, sparks, open flames and incompatible materials. Prolonged heating or contamination may promote polymerization and product-quality deterioration. Stabilizer:Some commercial or laboratory grades may contain a stabilizer such as BHT. Stabilizer type and concentration should be confirmed from the actual product specification or SDS rather than assumed for every shipment.

Sourcing High-Purity DCPD for PDCPD, UPR or Resin Production?

Royalchem suppliesDicyclopentadiene (DCPD, CAS 77-73-6)with a current typical high-purity specification of≥99.0% DCPD and ≤0.03% water. Applications include PDCPD reaction injection molding, unsaturated polyester resins, hydrocarbon resins, EPDM and specialty chemical synthesis. We support commercial sourcing withbatch-specific COA, SDS, specification confirmation and international logistics coordination.
Contact Royalchem for the latest specification, packaging options and bulk quotation.

Industrial Applications of Dicyclopentadiene

PDCPD / RIM	High-purity DCPD is the monomer for polydicyclopentadiene (PDCPD). Metathesis catalysts initiate rapid polymerization after the components are mixed and injected into a mold. The low initial viscosity makes the technology particularly suitable for large, complex and relatively thin-walled molded components.
Unsaturated Polyester Resins	DCPD is a well-established raw material for DCPD-modified UPR systems. These thermosetting resins are used in composites and FRP applications and represent an important industrial outlet for DCPD.
Hydrocarbon Resins	DCPD is used in the manufacture of hydrocarbon resins and modified resin systems for applications including adhesives, coatings, paints, varnishes and related formulations.
EPDM	DCPD is one of the diene monomers that can be incorporated as the third monomer in EPDM. The residual unsaturation provides sites for subsequent vulcanization and crosslinking.
Specialty Cyclic Olefins & Fine Chemicals	DCPD is an industrial source of cyclopentadiene and a starting point for norbornene derivatives, metallocene intermediates and other specialty cyclic olefin chemistry. DCPD-derived materials also enter optical, agrochemical and specialty chemical value chains.

Typical Quality Specifications

Test Item	Typical Specification
Appearance	Colorless to pale yellow clear liquid / crystalline solid
DCPD Assay, %	≥ 99.0
Color, Pt-Co	≤ 30
Water, %	≤ 0.03
Trimer & Co-dimers, %	≤ 1.0

Typical Royalchem high-purity specification. Final specifications and analytical results are subject to the actual commercial batch COA.

Packaging, Storage & Shipping

Packaging	Commercial packaging is selected according to product grade, order quantity and dangerous-goods transportation requirements. Steel drums, tanks or other approved containers may be used depending on the shipment.
Storage	Store under controlled conditions in a cool, well-ventilated area. Keep containers tightly closed and away from heat, sparks, open flames and incompatible materials. Prolonged heating or contamination may result in polymerization or quality deterioration.
Stabilizer	Some grades of DCPD are supplied with stabilizers such as BHT. The stabilizer type and concentration should be confirmed from the specification or SDS for the actual commercial grade.
Documentation	Batch COA, SDS, specification confirmation and dangerous-goods logistics documentation can be provided according to the commercial shipment.

Frequently Asked Questions

What is the correct abbreviation for Dicyclopentadiene?	The standard industry abbreviation for Dicyclopentadiene is DCPD. CAS number is 77-73-6. “DCPC” is not the standard abbreviation for this product.
What is DCPD mainly used for?	Major industrial applications include PDCPD reaction injection molding, unsaturated polyester resins, hydrocarbon resins and EPDM. DCPD is also used as a cyclopentadiene source for cyclic olefin and fine-chemical synthesis.
Why can DCPD be either solid or liquid?	DCPD has a melting point close to 32–33 °C. It may therefore appear as a crystalline solid below this temperature and as a clear liquid at warmer temperatures. This physical phase change is normal.
Why is high-purity DCPD important for PDCPD/RIM?	PDCPD polymerization uses highly active metathesis catalysts, and certain co-dimers, oligomers, water and other impurities may affect catalyst activity and polymerization behavior. High-purity DCPD is therefore generally preferred for RIM applications, while the exact impurity limits depend on the catalyst and process.
Is DCPD a direct monomer for COC/COP optical resins?	DCPD is better described as an upstream cyclic-olefin feedstock rather than a universal direct monomer for COC/COP. DCPD can be converted to cyclopentadiene and downstream norbornene-type intermediates, and DCPD-derived chemistry is used in specialty cyclic-olefin and optical-material value chains.
Does all commercial DCPD contain BHT?	No. Some commercial and laboratory grades are stabilized with BHT or other inhibitors, but this should not be assumed for every DCPD grade. Buyers should confirm stabilizer type and concentration from the supplier specification, COA or SDS.
Can Royalchem provide COA and SDS?	Yes. Batch-specific COA, SDS and specification confirmation can be provided for commercial supply. Customers using DCPD for catalyst-sensitive polymerization should specify the required purity, water, color, co-dimer and other impurity limits when requesting a quotation.