HANGZHOU KELI CHEMICAL CO., LTD.

Introduction

Hangzhou Keli Chemical Co., Ltd. (Chinese: 杭州科利化工股份有限公司) is a privately held Chinese manufacturer of chlorinated polymers, rubber compounds, and polymer-processing additives. Established in 1999, the company is headquartered in Qiantang District, Hangzhou, Zhejiang Province, and operates production facilities in Hangzhou and Jiangsu. Its principal product families include chlorinated polyethylene (CPE), CPE rubber, rubber compounds, triallyl isocyanate (TAIC), and triallyl cyanurate (TAC).

Keli occupies a specialized position in the plastics and rubber-materials supply chain. Rather than producing commodity polyethylene or finished plastic products, it supplies modifiers, elastomeric materials, and co-crosslinking agents used to adjust impact resistance, weatherability, heat resistance, oil resistance, flame performance, and processing behavior. Its materials serve applications including PVC profiles and pipes, electrical cables, hydraulic and automotive hoses, conveyor belts, engineering plastics, thermoplastic compounds, and selected photovoltaic and electronics-related products.

The company’s development reflects the expansion of China’s domestic advanced-materials sector since the late 1990s. Its current strategy combines large-scale CPE production with customized rubber compounds and specialty additives, linking its business to several structural trends in the plastics industry: demand for durable PVC formulations, growth in wire and cable infrastructure, increased use of modified polymers, and tighter requirements for material consistency and processing efficiency.

History and Development

Hangzhou Keli Chemical was established in 1999 as a developer and producer of chlorinated polymer materials and associated processing aids. Its growth has followed the increasing use of modified PVC and synthetic rubber in construction, infrastructure, transportation, electrical equipment, and industrial products.

Important development milestones include:

• 1999: Establishment of Hangzhou Keli Chemical and the beginning of its development in chlorinated polymer materials.
• Expansion into rubber compounds: The company broadened its portfolio beyond CPE resin to include specialized rubber compounds, raw-rubber sheets, and application-oriented formulations for hoses, cables, and other rubber products.
• Development of processing-aid production: TAIC and TAC were added to the product range, enabling the company to participate in the supply of co-crosslinking agents for thermoplastics and specialty rubbers.
• Expansion to two production bases: Hangzhou Keli Chemical and Jiangsu Keli New Materials Co., Ltd. together provide the company’s reported manufacturing platform for CPE, rubber compounds, and processing aids.

The company’s development illustrates a broader shift in the Chinese plastics sector from basic polymer supply toward formulation, modification, and application-specific materials. These activities require closer coordination among resin producers, compounders, processors, equipment suppliers, and downstream manufacturers.

Business Operations and Segments

Keli’s business is organized around three closely related activities:

The company reports annual total capacity of approximately 200,000 tonnes of CPE, 30,000 tonnes of rubber compounds and pure rubber sheets, and 4,000 tonnes of processing aids across its production facilities. Its Hangzhou site occupies approximately 535 mu, according to company information.

This operating model gives Keli exposure to both resin sales and higher-value formulation work. Standardized CPE products can be supplied in volume, while rubber compounds allow product properties to be adjusted for particular equipment, processing methods, or end-use requirements.

Products and Technologies

Chlorinated Polyethylene

Chlorinated polyethylene is a polyethylene-based polymer in which chlorine is introduced into the molecular structure. The resulting material combines characteristics associated with polyethylene and elastomeric or chlorinated polymers. Depending on grade and formulation, CPE can provide impact resistance, weatherability, resistance to oils and chemicals, flame-related performance, and compatibility with PVC and other polymer systems.

Keli identifies several principal CPE categories:

• CPE resin for PVC impact modification: Used in PVC extrusion and injection molding, including profiles, pipes, sheets, and engineering-plastic formulations.
• CPE rubber: Used where resistance to heat, oils, chemicals, and outdoor aging is required, particularly in wire and cable, hydraulic hoses, conveyor belts, magnetic materials, and molded rubber components.
• CPE for flame-retardant ABS modification: Developed for modifying ABS-based systems and improving selected performance characteristics in specialized formulations.

In PVC processing, CPE is commonly incorporated during compounding with PVC resin, stabilizers, lubricants, pigments, and other modifiers. The compound is then processed through equipment such as twin-screw extruders, profile extruders, pipe extruders, or injection-molding machines. The appropriate CPE grade influences dispersion, impact strength, fusion behavior, surface quality, and the balance between toughness and stiffness.

Rubber Compounds

Keli supplies pre-formulated rubber compounds and pure-rubber sheets for downstream processing. Such compounds can contain a base elastomer, reinforcing fillers, plasticizers, antioxidants, curing agents, pigments, and other additives selected for a particular application.

Its hose-oriented compounds are described as providing resistance to oil, heat, weathering, and different service media. These properties are relevant to automotive hoses, hydraulic hoses, and industrial fluid-transfer systems. In practice, the compound is processed through mixing equipment, calenders, extrusion lines, or molding systems before vulcanization or other curing operations.

Cable compounds form another application category. Keli describes materials for wire and cable grades, including insulation and sheathing materials, with emphasis on processing behavior, electrical insulation, and resistance to aging in air.

TAIC and TAC

Triallyl isocyanurate (TAIC) and triallyl cyanurate (TAC) are multifunctional additives used in crosslinking and co-crosslinking systems. Their reactive allyl groups can participate in peroxide- or radiation-assisted crosslinking of selected polymers and rubbers.

The company identifies applications in:

• Thermoplastic and specialty-rubber modification
• Crosslinking and auxiliary curing systems
• Ion-exchange resins
• PCB epoxy-base materials
• Solar-cell EVA encapsulant films
• Other polymer systems requiring enhanced network formation or thermal performance

The performance contribution of these additives depends on polymer type, dosage, curing chemistry, processing temperature, and the required balance among flexibility, strength, heat resistance, and dimensional stability.

Applications and End Markets

Keli’s materials serve multiple downstream sectors rather than a single finished-product market.

Building and Infrastructure Products

CPE-modified PVC is used in profiles, pipes, sheets, and related extrusion products. Impact modification is particularly relevant where PVC components must withstand handling, installation loads, temperature variation, and outdoor exposure.

Electrical and Cable Products

CPE rubber and cable compounds are used in insulation and sheathing systems. Important performance considerations include electrical insulation, flame behavior, flexibility, resistance to oils and chemicals, and long-term aging.

Automotive and Hydraulic Systems

Rubber compounds for automotive and hydraulic hoses must maintain integrity under pressure, cyclic movement, heat, contact with oils or fluids, and outdoor or engine-compartment exposure. Customized formulations allow compounders to adapt material properties to specific hose constructions and service conditions.

Industrial Rubber Products

CPE rubber and related compounds are used in conveyor belts, molded components, seals, and other industrial products. These applications generally require a combination of mechanical durability, resistance to environmental exposure, and stable processing.

Engineering Plastics and Specialty Formulations

CPE grades used in ABS and other engineering-plastic systems can contribute to impact modification and selected flame-related or processing properties. The technical requirements in these applications are typically more formulation-specific than those of standard PVC products.

Renewable-Energy and Electronics Materials

TAIC and TAC are identified for use in EVA encapsulant films for solar cells and in PCB-related materials. These applications connect Keli with markets in which crosslinking control, thermal stability, electrical performance, and long-term reliability are important.

Global Presence and Market Position

Keli is based in Hangzhou, one of China’s significant manufacturing and chemical-industry centers, and operates an additional production facility through Jiangsu Keli New Materials. The company’s products are positioned for both domestic Chinese consumption and international supply, with trade-data platforms recording export activity in CPE, elastomeric materials, and related polymers.

Its market position is best understood as that of a specialized materials supplier serving processors and compounders. The company competes through a combination of:

• Large reported CPE capacity
• A broad product range spanning resin, rubber, and additives
• Customized formulation capability
• Integration between material development and downstream application requirements
• Proximity to China’s extensive PVC, cable, rubber, automotive, and infrastructure-manufacturing base

CPE demand is influenced by construction activity, PVC-processing volumes, infrastructure investment, and the availability and cost of competing impact modifiers. Rubber-compound demand is more closely tied to automotive production, industrial equipment, wire and cable investment, and replacement markets. TAIC and TAC sales are exposed to specialty-polymer, electronics, and photovoltaic-material cycles.

Research and Development

Keli describes itself as a high-tech enterprise specializing in research and development, production, and sales of chlorinated polymers and related processing aids. Its research orientation is reflected in the breadth of grades offered for PVC, ABS, cable, hose, and specialty-rubber applications.

The principal areas of technical development include:

• Adjustment of CPE grades for different PVC-processing conditions
• Development of elastomeric CPE grades with targeted heat, oil, chemical, and weather resistance
• Customization of rubber compounds for hose, cable, and industrial applications
• Optimization of TAIC and TAC for crosslinking and co-crosslinking systems
• Improvement of compatibility, dispersion, processing stability, and finished-product performance

For downstream processors, application support is important because the same modifier can produce different results depending on resin type, filler loading, stabilizer package, screw design, shear history, processing temperature, and cooling conditions. Consequently, the commercial value of a specialty-material supplier depends not only on nominal product specifications but also on repeatability and formulation assistance.

Sustainability and Environmental Considerations

The environmental profile of Keli’s products is connected to both manufacturing controls and downstream polymer use. Chlorinated polymers require careful management of process emissions, wastewater, solid residues, worker exposure, and product stewardship. Manufacturing facilities must therefore operate within applicable Chinese requirements for chemical production, environmental protection, occupational safety, and hazardous-material handling.

CPE can extend the service life of PVC and rubber products by improving resistance to impact, weathering, oils, and chemicals. Longer service life can reduce replacement frequency in certain applications, although the ultimate environmental outcome depends on product design, additives, use conditions, collection systems, and end-of-life treatment.

The principal sustainability challenges associated with this product category include:

• Managing chlorine-containing chemical streams during production
• Reducing energy and water consumption in polymer and compound manufacturing
• Controlling emissions and industrial wastewater
• Improving material efficiency and production yield
• Addressing end-of-life pathways for PVC- and rubber-containing products
• Maintaining compliance with evolving restrictions on additives and chemical substances

In the broader plastics industry, regulatory attention increasingly focuses on chemical transparency, recyclability, emissions, and circularity. These trends create both compliance requirements and opportunities for suppliers that can support durable products, compatible formulations, and improved recycling performance.

Quality Management and Certifications

Quality control is central to CPE and compound manufacturing because small changes in chlorine content, molecular structure, particle characteristics, additive concentration, or dispersion can affect processing and final-product performance.

Relevant control areas include:

• Chemical composition and chlorine-content consistency
• Mooney viscosity and rheological behavior for elastomeric grades
• Particle size, bulk density, and flow characteristics for resin products
• Tensile strength, elongation, hardness, and aging performance
• Heat, oil, weather, and chemical resistance
• Electrical properties for cable compounds
• Crosslinking behavior for TAIC- and TAC-containing systems
• Batch traceability and production repeatability

The company presents itself as a high-tech enterprise and supplies materials for technically demanding applications. Specific certification claims, however, should be assessed against current certificates, customer qualification records, and applicable product documentation for each grade and production site.

Financial Performance and Economic Impact

Hangzhou Keli Chemical is privately held, and publicly accessible information identifies its production capacities and product portfolio more clearly than its audited financial statements. External commercial databases provide indicative estimates or trade records, but such figures should not be treated as equivalent to audited company accounts.

The company contributes to the regional and industry economy through:

• Production of domestically manufactured chlorinated polymers and processing aids
• Supply to PVC, cable, hose, automotive, and industrial-rubber manufacturers
• Employment in chemical production, technical service, quality control, logistics, and administration
• Demand for feedstocks, packaging, laboratory services, industrial equipment, and transport
• Support for downstream value creation in construction materials, infrastructure, transportation, and electrical products

Its economic exposure includes fluctuations in ethylene- and chlorine-related feedstock costs, energy prices, freight rates, currency movements, PVC and rubber demand, and capacity changes across the Chinese chemical industry.

Innovations and Future Outlook

Keli’s future development is likely to be shaped by the interaction of capacity, product specialization, and regulatory pressure. The company’s existing portfolio provides a platform for expansion into higher-value grades and more application-specific compounds.

Potential areas of strategic importance include:

• Higher-performance CPE grades for demanding PVC and engineering-plastic applications
• Low-odor and low-emission formulations for indoor and transportation uses
• Specialized cable and hose compounds with improved durability and processing efficiency
• Materials designed to support longer product service life and improved recyclability
• More precise control of crosslinking additives for photovoltaic, electronics, and specialty-rubber applications
• Greater digitalization of process monitoring, laboratory testing, and batch traceability
• Energy and emissions reductions across CPE and compound production

Market prospects will depend on construction and infrastructure demand, electrical-grid investment, vehicle and machinery production, export conditions, and the evolution of PVC and rubber-formulation technology. Competition is likely to remain sensitive to price, product consistency, local technical support, regulatory compliance, and the ability to tailor materials to processor requirements.

Summary

Hangzhou Keli Chemical Co., Ltd. is a Chinese specialty-materials manufacturer established in 1999 and focused on chlorinated polyethylene, CPE rubber, rubber compounds, and co-crosslinking agents. With production facilities in Hangzhou and Jiangsu and reported capacity of 200,000 tonnes of CPE, 30,000 tonnes of rubber compounds and pure-rubber sheets, and 4,000 tonnes of processing aids, the company operates across several important segments of the plastics and rubber value chain.

Its significance lies in supplying functional materials rather than finished plastic products. CPE supports impact modification and durability in PVC and other polymer systems, while rubber compounds and TAIC/TAC additives serve cable, hose, automotive, industrial, photovoltaic, and electronics-related applications. The company’s long-term position will depend on maintaining consistent quality, developing higher-value formulations, managing environmental and regulatory requirements, and responding to changing demand for durable, efficient, and more sustainable polymer materials.

References

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  CPS+ eMarketplace. (n.d.). HANGZHOU KELI CHEMICAL CO., LTD.HANGZHOU KELI CHEMICAL CO., LTD.. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1042549Link