Kingflex
Kingflex
Direct supply from state-of-the-art Chinese manufacturing facilities. Global standards compliance.
Closed-cell elastomeric duct insulation is designed to address thermal management, condensation control, and structural durability in modern HVAC, mechanical piping, and industrial systems. Unlike traditional open-cell materials like fiberglass, closed-cell NBR/PVC elastomeric foam features a structure composed of millions of independent micro-cells. This configuration locks in dry air, providing stable thermal conductivity (k-value) even in high-moisture environments.
By preventing water vapor transmission, Kingflex closed-cell insulation maintains high thermal resistance over an extended service life. The material eliminates the need for an external vapor barrier, reducing installation labor and minimizing the risk of corrosion under insulation (CUI) in chilled water lines and HVAC air ducts.
"Selecting the correct closed-cell duct insulation requires analyzing thermal conductivity stability under operating conditions, water vapor diffusion resistance, and fire safety ratings. We manufacture our elastomeric products to perform reliably across demanding institutional, industrial, and commercial settings."
Engineered parameters meeting global commercial construction and cryogenic piping standards.
Maintains stable thermal conductivity at ≤ 0.034 W/(m·k) at 0°C, ensuring energy conservation across heating and cooling lines.
Moisture resistance factor (μ) ≥ 10,000 creates an integrated vapor barrier that prevents condensation on cold surfaces.
Meets Class 0/Class 1 fire safety ratings according to BS 476, with self-extinguishing properties that prevent flame propagation.
Annual Production Capacity (m³)
Years of Group Manufacturing History
Export Countries & Regions
Closed-Cell Uniform Density Rate
Decades of continuous expansion and development in green-building thermal insulation materials.
Kingflex Insulation Co., Ltd. is a professional manufacturing and trading combo for thermal insulation products. Kingflex research development and production department is located in well-known capital of green-building materials in Dacheng , China. It is an energy-saving environmental friendly enterprise concentrate the research and development, production and sales. In operation, Kingflex takes energy saving and consumption reduction as the core concept. We provide the solutions regarding the insulation by means of consultation , research and development production, installation guidance, and post-sale service to lead the development of global building materials industry.
Kingflex is established by Jinwei Group which is more than 40 years history. Kingway Group is established in 1979. It was the first manufacturer of thermal insulation materials north of the Yangtze River. Over the course of four decades, the group has pioneered structural improvements in cross-linked elastomeric foam production, growing from a regional supplier to a major player in international B2B insulation systems.
Our employees is amazing in their own right, but together they are what makes Kingflex such a fun and rewarding place to work. Kingflex team is a tight-knit,talented group with a shared vision of giving consistently first class service for our clients. Kingflex has eight professional engineers in R & D Department, 6 professional international sales, 230 workers In production department.
At present, Kingflex has 5 large automatic assembly lines, with an annual production capacity of more than 600,000 cubic meters, and has become a designated production enterprise designated by the Ministry of Energy, the Ministry of Electric Power and the Ministry of Chemical Industry. Kingflex thermal insulation products are widely used in construction, petroleum, chemical, national defense, aerospace and other industries. And Kingflex products have been exported to more than sixty-six foreign countries all over the world in the past 16 years.
Supply customers all over the world with full set of energy saving insulation system solution. Supply integrated solution provider of thermal insulation, cold insulation and noise reduction for buildings and industries. We prioritize reducing carbon footprints throughout the lifecycle of our closed-cell rubber products, utilizing clean expansion agents and automated heat-recovery systems during the curing cycle.
Continuous investment in material sciences to meet strict HVAC regulations and low-temperature pipeline demands.
Our dedicated R&D division has implemented testing protocols designed to check crosslinking density, tensile strength, and aged thermal resistance. With continuous inline laser scanning, each production batch achieves consistent physical properties, minimizing site failure and installation scrap.
Export-ready products conforming to BS 476, CE, REACH, ROHS, UL94, and ASTM requirements.
Developing next-generation elastomeric insulation systems for environmental compliance and operational efficiency.
Implementing water-blown and HFO-based technology across all 5 automatic lines. Eliminates ozone-depleting substances and reduces Global Warming Potential (GWP) to comply with international carbon-neutral building initiatives.
Integrating low-emissivity composite coatings and thin-film foils into rubber sheet rolls. Improves exterior physical protection while lowering surface emissivity to optimize temperature control in critical areas.
Synthesizing bio-derived EPDM and NBR alternatives utilizing plant-based precursors. Reduces reliance on petrochemical feedstocks while maintaining fire resistance and thermal performance standards.
Custom structural setups for chemical, commercial HVAC, rail transit, and heavy industry plants.
Large-scale central air-conditioning supply air ducts require thick insulation layers to prevent cold loss. Kingflex closed-cell rubber sheet rolls are bonded directly to galvanized steel sheet surfaces, providing thermal insulation while dampening duct vibration noise.
At temperatures below -40°C, moisture migration can quickly turn to ice and rupture insulation. Our multi-layer elastomeric low-temperature systems protect process piping, maintaining flexibility to absorb thermal contraction stresses.
For hospital, mall, and hotel applications, air safety and fire performance are critical. Our fiber-free, zero-VOC dust-emission elastomer ensures that duct linings do not contribute to particulate counts, protecting indoor air quality.
In-depth technical breakdown of Kingflex standard lines: sheet rolls and pre-slit pipe insulation.
Kingflex Standard Dimension
1. Foams evenly and fully, closed cell rate over 98%, providing consistent thermal insulation.
2. Full closed-cell structure offers low moisture absorption and stable long-term thermal conductivity.
3. Compression resilience over 80% prevents collapse during installation.
4. Flame retardant properties make the material self-extinguishing.
5. Low thermal conductivity and high moisture resistance factor.
Central air conditioning ducts; commercial wall, roof, and basement thermal & sound insulation; prevention of freezing and condensation in HVAC piping; industrial equipment and storage tank systems.
Kingflex Standard Dimension
1. Foams evenly and fully, closed cell rate over 98%, providing consistent thermal insulation.
2. Professional pipe spraying equipment ensures even coating and precise internal dimensions.
3. Compression resilience over 80% protects pipes from physical impact.
4. Flame retardant properties make the material self-extinguishing.
5. Low thermal conductivity and high moisture resistance factor.
6. Reduces the risk of pipe freezing and cracking.
Central HVAC chilled/hot water piping; anti-condensation in building water supply networks; commercial refrigeration pipelines; high-temperature steam lines; solar and hot water systems.
Our elastomeric systems installed in commercial, marine, and high-performance industrial settings.
How our automated production lines and raw material purchasing power support large-scale construction projects.
Our Dacheng facility utilizes automated mixing and dosing systems for continuous extrusion. By monitoring density distribution and heating profiles in real-time, we maintain physical consistency across all production runs.
With five continuous extrusion lines running 24/7, we manage lead times for high-volume orders. This setup reduces delays during seasonal peaks in HVAC demand.
We source NBR/PVC polymers directly from primary suppliers, reducing exposure to chemical market price shifts and ensuring supply security for international partners.
Addressing the specific supply chain, regulatory, and technical requirements of multinational engineering groups.
Located near major shipping ports, we export to more than 66 countries. We use compressed vacuum packaging options for sheet rolls and heavy-duty protective bags for pre-formed pipes to optimize container space and protect products during long-distance transit.
Our technical team provides submittal packages, including independent test reports for thermal conductivity, ASTM E84 smoke development indices, vapor transmission values, and environmental product declarations (EPDs) required for green building credits.
All Kingflex product batches are marked with unique tracking codes that log raw material feeds, curing timestamps, and quality control checks. This transparency helps project managers track material specifications and resolve installation issues quickly.
Answers to technical, regulatory, and procurement questions about closed-cell duct insulation.
A1: It is mainly used for HVAC ducts, air conditioning pipes, building thermal insulation, industrial pipeline cold insulation, and sound insulation. The closed-cell structure makes it particularly effective in cold-temperature and high-humidity applications where surface condensation must be prevented.
A2: Yes, our rubber foam insulation products are flame retardant, meeting BS 476 Class 0 and Class 1, UL94 V-0, and ASTM E84 standards. The material is self-extinguishing, does not melt, and produces low smoke density in fire conditions, satisfying national and commercial building codes.
A3: Rubber foam is flexible, closed-cell, and moisture-proof, making it suitable for HVAC ductwork and low-temperature/cryogenic systems without an external vapor barrier. Rock wool is high-temperature resistant and fireproof, suited for industrial high-temperature steam pipelines and furnace insulation but requires an external vapor jacket to prevent moisture intrusion.
A4: Yes, we offer OEM services, including custom thicknesses (from 6mm up to 50mm), pre-applied adhesive backings, aluminum foil facings, and customized internal pipe diameters. We also supply customized dimensions for specific project requirements.
A5: Our products are certified under BS 476, CE, REACH, ROHS, UL94, and ASTM standards. Testing by third-party laboratories confirms compliance with international quality and safety requirements, ensuring suitability for global projects.
A6: Yes, Kingflex operates a batch-traceability system. Each product batch is marked with an identification code linking it to raw material batches, quality control records, and production parameters, assisting with project documentation and verification.
A7: We produce rubber foam insulation sheets in thicknesses ranging from 6mm up to 50mm. Standard thicknesses include 6mm, 9mm, 13mm, 19mm, 25mm, 32mm, 40mm, and 50mm to meet different thermal barrier and condensation control requirements.
A8: When installed according to manufacturer guidelines, the typical service life is about 10 to 15 years under normal operating conditions. Regular maintenance checks help verify system integrity over time.
Engineered elastomeric and mineral fiber products for industrial processes and cryogenic services.
Transparency in order placement, production updates, and shipping coordination.
Continuous warehouse monitoring prevents dust accumulation and damage to finished sheet rolls.
