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HS Code |
257892 |
| Name | 1,3-Cyclopentadiene |
| Molecular Formula | C5H6 |
| Molar Mass | 66.10 g/mol |
| Cas Number | 542-92-7 |
| Appearance | Colorless liquid |
| Density | 0.802 g/cm³ |
| Melting Point | -97.2 °C |
| Boiling Point | 42.5 °C |
| Flash Point | -17 °C |
| Refractive Index | 1.480 |
| Solubility In Water | Insoluble |
| Odor | Pungent, unpleasant |
| Autoignition Temperature | 482 °C |
| Vapor Pressure | 220 mmHg (20 °C) |
| Pubchem Cid | 9254 |
As an accredited 1,3-Cyclopentadiene factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 1,3-Cyclopentadiene is packaged in a 500 mL amber glass bottle with a secure screw cap to prevent light exposure. |
| Shipping | 1,3-Cyclopentadiene should be shipped in tightly sealed containers under an inert atmosphere, such as nitrogen, to prevent dimerization and oxidation. The chemical is highly flammable and volatile, requiring storage and transport away from heat, sparks, and open flames. Ensure labeling complies with hazardous material regulations, and use secondary containment for added safety. |
| Storage | 1,3-Cyclopentadiene should be stored in tightly sealed containers under an inert atmosphere, such as nitrogen, to prevent polymerization and oxidation. It must be kept in a cool, dry, well-ventilated area, away from heat, sunlight, and sources of ignition. Refrigeration is recommended. Avoid contact with acids, bases, and oxidizing agents. Use only spark-proof tools and explosion-proof equipment. |
Applications of 1,3-Cyclopentadiene in Industrial Manufacturing1,3-Cyclopentadiene serves as a core building block in several advanced industrial sectors. Our production integrates strict quality management at each stage, from fractional distillation to custom-grade output, ensuring downstream manufacturers achieve reliable results in every application. The following scenarios detail distinct industrial utilizations, each governed by clear regulatory standards, process integration points, and targeted end-product characteristics. 1. Synthesis of Dicyclopentadiene for Specialty Chemical IntermediatesManufacturers utilize 1,3-cyclopentadiene primarily in controlled dimerization reactions under catalytic or thermal conditions to yield dicyclopentadiene (DCPD), a widely demanded monomer for specialty chemical intermediates. Accurate process temperatures and feedstock purity levels are required to minimize polymeric byproducts and maintain compliance with specialty chemical production codes. The resulting DCPD intermediates serve as foundational units in advanced resin, polyolefin co-catalysts, and specialty plastics factory chains. Industry compliance standards
Typical usage ratio
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2. Advanced Resin and Adhesive Formulation for Automotive CompositesPolymer facilities employ our 1,3-cyclopentadiene as a critical diene in C5 resin synthesis, reacting with acrylate or maleic anhydride functionalities to deliver high-tack adhesives and engineered toughened resins for advanced automotive panels. Each batch undergoes micro-impurity screening to satisfy stringent OEM and aftermarket resin quality thresholds. Maintained polymer reactivity and cure profiles directly impact composite part mechanical strength, volatility, and downstream adhesion reliability for bodywork and structural assemblies. Industry compliance standards
Typical usage ratio
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3. Manufacturing of Norbornene for Advanced Polyolefin and Optical MaterialsPetrochemical and specialty monomer producers engage 1,3-cyclopentadiene in Diels–Alder reaction systems with ethylene to synthesize norbornene. Careful control of feedstock ratios, residence times, and heat management is required, due to the sensitivity of norbornene monomer properties affecting subsequent copolymerization performance. Downstream users implement rigorous synthesize-to-spec delivery for optical grade plastics, cyclic olefin copolymers, and advanced engineering polymers. Industry compliance standards
Typical usage ratio
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GMP-compliant pharmaceutical manufacturers apply high-purity 1,3-cyclopentadiene as a strategic intermediate in the synthesis of select cyclopentanoid frameworks, which form the core scaffolds in corticosteroids and antiviral candidates. Tight controls are implemented on isomer content and trace metal residues to meet pharmacopeia specifications, as downstream reaction kinetics and product bioactivity depend on precise monomer quality and contamination control. Industry compliance standards
Typical usage ratio
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5. Production of Hydrocarbon Resins for Tire and Rubber AdditivesRubber goods and tire manufacturers use this diene extensively as a blendstock for C5 hydrocarbon resins that reinforce tread compounds and improve compound tack and green strength. Strict process impurity controls and stable pre-dimerized grades allow for batch-to-batch consistency in resin characteristics, which directly impacts vulcanization efficiency and finished tire performance metrics under regulatory durability and environmental safety frameworks. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
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In the day-to-day world of chemical manufacturing, 1,3-Cyclopentadiene keeps showing its value across numerous sectors. This diene has a reputation for reactivity and reliability—something we have observed over years of hands-on production, handling, and feedback from specialist partners. Our own synthesis approach remains grounded in small-batch distillation, pulled directly from dicyclopentadiene cracking, an age-old yet trusted preparation method in our facility. Each run produces a clear, colorless liquid with a distinctly sharp odor—a sensory confirmation of freshness and purity valued in a reactive monomer.
We keep specifications tight, driven by the requirements set by both domestic and international synthesis plants. Our standard model usually grades above 98 percent purity by GC analysis, with water content checked below 0.1 percent, as moisture-sensitive users can’t afford the risks of hydrolytic side reactions. Boiling point sits right at the expected 42°C—enough volatility for easy isolation, yet manageable for safe storage under inert gas blankets. Shelf life, from our experience, depends on this careful storage under nitrogen or argon and at low temperatures; any deviation invites quick dimerization, reducing its efficacy sharply.
Customers often ask about the color. In practice, fresh 1,3-Cyclopentadiene should appear clear. Pale yellow or darkening usually signals dimerization or oxidation, and we inform users to avoid product held too long at room temperature. Direct from our vaults, product never sees extended exposure above 0–5°C, and we fill and seal every container within a controlled, deoxygenated chamber.
In practice, the main reason synthetic chemists return to 1,3-Cyclopentadiene stems from its unique diene reactivity. We see this monomer in action during Diels–Alder cycloadditions, where its structure and unencumbered double bonds engage dieneophiles faster than almost anything else in the toolbox. Specialty elastomer manufacturers rely on it for precision crosslinking, producing resins that must withstand punishing temperatures or chemical exposures. Here, a fresh, high-purity feed makes the difference between a successful lot and a costly recall.
Pharmaceutical intermediates tell another story. Researchers like the way 1,3-Cyclopentadiene’s cyclic structure creates five-membered rings that show up across experimental bioactive molecules and agrochemical prototypes. Years ago, we received feedback from one group who managed to build a whole new polymeric scaffold by swapping out their former diene with our fresh product. Their reaction produced higher yields and fewer side products, simply because they started with a clean, high-purity reactant—and this sort of real-world difference keeps reinforcing our quality approach.
Metallocene catalyst producers push the demand for ultrapure grades even further. Here, even faint traces of oxygen or dimer content will poison entire catalyst runs, so producers don’t compromise on batches or storage approaches. With these partners, we fine-tune deoxygenation steps and monitor residuals with specialized detectors, since a single poorly stored drum can mean substantial lost value for a large polymer plant. It comes down to trust—their process, our product.
As a manufacturer, our direct work with 1,3-Cyclopentadiene grants us a front-row seat for comparing it with related compounds. We get questions about methyl-substituted cyclopentadienes or even dicyclopentadiene as substitutes. Chemically, while dicyclopentadiene serves as a stable transport and storage form, it must be cracked fresh to yield monomeric 1,3-Cyclopentadiene. Skipping this step and letting a mix sit out sacrifices both yield and selectivity; the dimer can’t directly replicate the performance in Diels–Alder syntheses, nor does it dissolve as cleanly into some reaction solvents we’ve tested.
We have tried, as have several customers, to store or ship monomeric product for extended periods. Without active cold chain maintenance and strict inerting, diene content falls rapidly as dimerization proceeds. Cooling and inert atmosphere aren’t optional in practice—they’re learned from batches that failed in the early days, and the protocol sticks because real-world results depend on it.
Anecdotal feedback and in-house trials both suggest that even alternative dienes such as furan or isoprene don’t replicate the sharp selectivity and kinetic drive seen in Diels–Alder reactions with 1,3-Cyclopentadiene. Whether forming complex, multi-ring structures or entering into further polymerization, this diene holds an edge thanks to its open accessibility at the 1 and 3 positions—the very feature the synthetic community prizes.
The monomer doesn’t exist in isolation for long. That lessons sits deep in every technical logbook on our shop floor. In raw form, 1,3-Cyclopentadiene polymerizes with alarming speed at ambient conditions. Its tendency to revert to dicyclopentadiene shaped our entire approach: we always crack fresh dimer on demand, minimize headspace, and skip unnecessary transfers. Each time we deviate, we’ve seen product loss and performance drops.
Years of scaled production have taught us storage and packing tricks. Stainless steel drums lined with PTFE prove more reliable than basic HDPE in long-term exposure. Only a fraction of suppliers take this extra step, but as origin-point manufacturers, small advantages add up fast—customers detect simpler handling, longer shelf life, and fewer off-grade drams reported. Unless customers request otherwise, we target container sizes that balance usage rates with practical handling, since smaller vessels reduce oxygen ingress risk during withdrawals.
Our health and environmental team maintains clear SOPs during monomer handling. Operators wear nitrile gloves and work under extractor hoods, since the sharp hydrocarbon odor can signal skin and mucous membrane irritation after prolonged contact. While we control exposure, our downstream buyers rarely face direct contact, since the process, especially in large installations, is usually closed-loop until the diene is consumed fully in reaction.
Physical safety extends beyond the shop floor. Regulatory reporting demands that every outgoing batch’s SDS details the risks and emergency measures. We’ve answered questions from both university researchers and industrial clients about fire prevention, since the low flash point—right below room temperature—places this monomer in a different risk category than more sedate di- or trimers used for storage. Specialized refrigeration units and frequent leak checks meet both code and practical risk management.
Above all, the main difference stands in how the monomer leaves our plant. No third-party refilling, no mixing with similar-looking fractions. Every outgoing batch comes directly from fresh, on-site distillation. This supply chain integrity drives the success of hundreds of synthetic projects, from new-generation catalysts to pilot batches of elastomers for automotive and aerospace uses.
We see competitor samples on occasion—sometimes customers send us residues that failed to live up to spec for re-analysis. More often than not, degradation comes down to handling: an extra day at room temperature, or poor purging with nitrogen, can lead to rapid conversion to the dimer—hardly ideal for kinetic or selectivity-driven syntheses. Our strict cold-chain shipment means batches reach their end-users with near-lab-grade freshness, ready for immediate use without the need for further purification.
Shipments travel using chromed or PTFE-lined drums, top-filled inside inerted gloveboxes, and reached only after customer order triggers on-site cracking and collection. By ensuring rapid turnover and minimal storage, we cut the chance of unwanted reactions in transit to near zero. These measures came not from theory, but countless iterations working alongside our customers and listening to their process concerns.
Our technical support team shares more than just figures—they draw on direct production and user feedback. We don’t push the product without context. Instead, most inquiries inspire a conversation about reaction conditions, storage cautions, and possible alternatives for sensitive project timelines. In more than one case, project teams have called back after months to discuss a positive yield shift traced straight to fresher, higher-purity 1,3-Cyclopentadiene.
By keeping batch records, chromatograms, and tank logs open for review, the team supports the chemistry community in a way traders cannot. Most customers appreciate this up-front transparency, as it means they spend less time troubleshooting and more on actual product development.
We’ve fielded key questions over the years about grade selection, impurity profiles, and synthetic compatibility. From graduate-level researchers to plant engineers, users want details about reactivity and stability. To support them, we check every lot with in-house NMR and trace metal analysis, giving a granular look at product suitability. If the lot doesn’t meet our own reactivity benchmarks, that run gets reprocessed or recycled—no exceptions, since cutting corners rarely pays off in the specialty chemicals space.
In projects involving metallocene catalysts or precision organometallic reactions, even single-digit ppm levels of some contaminants can create measurable downstream issues. Our on-site purification process draws on repeated distillation and filtration steps, always monitored by instrument techs who know the subtleties of each reactor load and what changes can mean in terms of product shelf life.
For those doing bench-scale synthesis, the benefits are clear. They avoid the surprise of off-odors, yellowing, or dimer formation after a few days—issues we see commonly with higher-temperature or open-air storage. Frequent user reviews point to increased output consistency and easier reaction purification, further reinforcing the importance of up-front product integrity.
Over the last decade, raw material and logistics costs have spiked and dipped, often unrelated to demand swings on the consumer side. By sourcing and cracking dicyclopentadiene directly in-house, we anchor our costs more stably than firms reliant on outside suppliers or cross-border shipments. This internal control buffers both cost and quality shifts, giving us leeway to weather the periodic peaks in energy or feedstock pricing, which can cause steep market price swings elsewhere.
There’s no glossing over the specialized equipment required for on-demand cracking and low-temperature handling. The capital investment is substantial, and ongoing maintenance costs run higher than passive storage options. Yet, over the years, this investment pays off by fostering trust and repeat orders from clients who need consistent, rapid-turnover diene supply for their most demanding applications. Whether it’s a short-notice order for academic research or a monthly drum shipment to a production line, this reliability drives technological and commercial partnerships.
Handling 1,3-Cyclopentadiene offered its fair share of hurdles in the early days. Off-gassing led to odor complaints. Dimer formation reduced the active content of monomer drums left in poorly chilled storage bays. Even minor temperature spikes could result in container bulging and costly loss. By switching to smaller, batch-matched vessels and building dedicated cold-room storage, we minimized these issues and established best practices shared widely with our customers.
Experienced users follow suit, drawing from our recommended transfer guidelines and monitoring kits to ensure quality doesn’t slip between delivery and use. For projects needing higher certainty, we can run split-lot analyses post-delivery, confirming that quality persists through the first critical hours after receipt.
R&D teams keep looking for improvements in both synthesis efficiency and environmental footprint. Efforts to optimize cracking conditions have yielded energy savings and, in large-scale installations, lower emissions compared with older batch processing. Each test run is documented with digital logs and shared with the broader community, driving a collaborative, experience-based push toward smarter production and smarter use.
As customers’ needs shift—especially toward better-defined pharmaceuticals and next-generation polymers—we adapt with more selective purification and fractionation technology. Direct engagement between our chemists and those in the field uncovers issues early enough for practical solutions, blending production knowledge with creative problem-solving.
Every shipment of 1,3-Cyclopentadiene leaving our racks speaks for a broad legacy of on-the-ground chemical production knowledge. From mastering the subtleties of storage to field-testing new application ideas, every step reflects a commitment not just to meeting— but to understanding—the unique needs of users across laboratories and factories. The challenges in producing, storing, and supplying reactive chemicals remain real, but they also build a culture of responsibility, accuracy, and pride for our team. The diene’s unique performance as a synthesis tool makes our work worth the rigor.
We keep welcoming new questions, encourage technical exchanges, and above all, deliver every drum with the confidence that comes from decades of practice and an open, two-way dialogue with those who put real chemistry into action.
