Engineered to mitigate thermal bridges, stop condensation, and optimize energy conservation metrics.
Premium NBR material offering dynamic sound attenuation & moisture protection.
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Industrial grade elastomeric sheets optimized for broad temperature HVAC pipelines.
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Flexible pipe insulation for split systems, refrigeration loops, and plumbing lines.
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Color-coded industrial foam rolls designed for pipe line identification and aesthetics.
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Extreme duty elastomeric barriers preventing thermal transfer down to -200°C.
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Self-sealing and standard tubular foam preventing condensation on chilled water pipes.
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Co-extruded nitrile and vinyl sheet insulation for industrial custom die-cuts.
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Reinforced alu-clad vapor barrier for heavy-duty outdoor duct protection.
View DetailsModern ventilation networks are shifting away from traditional fiberglass wrap to advanced elastomeric closed-cell insulation. With global green building standards like LEED, BREEAM, and ASHRAE 90.1 driving stringent thermal efficiency codes, mechanical designers prioritize materials with long-term, stable thermal conductivity.
China has established itself as the center of elastomeric rubber foam manufacturing. Modern production plants in Dacheng leverage fully automated, continuous vulcanization lines. This ensures highly uniform density profiles, minimal cell sizes, and a higher closed-cell ratio (above 98%), translating to lower water vapor transmission rates.
Products conform directly to structural building safety metrics globally, mitigating flame propagation in high-rise duct lines.
Engineered insulation significantly decreases HVAC carbon footprints by reducing energy loss through walls, ducts, and pipes.
Closed-cell architectures prevent moisture penetration, eliminating structural rust, mold, and indoor air quality degradation.
High-density foam cores block structural noise, dampening fan motor vibrations and airflow resonance in metal ducts.
Understanding the microstructural performance is key to selecting the correct fresh air duct insulation. Elastomeric rubber foam combines Nitrile Butadiene Rubber (NBR) and Polyvinyl Chloride (PVC) into a flexible, chemically stable matrix. The following technical comparison details why NBR/PVC outperforms traditional fibrous insulation like glass wool or rock wool in medium-to-low temperature systems.
| Performance Index | Kingflex Elastomeric NBR/PVC | Traditional Rock Wool / Fiberglass | Polyethylene (PE) Foam |
|---|---|---|---|
| Thermal Conductivity (λ at 0°C) | ≤ 0.034 W/(m·K) | 0.038 - 0.045 W/(m·K) | 0.037 - 0.041 W/(m·K) |
| Water Vapor Resistance (μ value) | ≥ 10,000 (Built-in Vapor Barrier) | 1 (Requires separate vapor jacket) | ≥ 3,500 |
| Fire Classification | BS 476 Class 0, UL94 V-0, GB 8624 Class B1 | Non-combustible (Class A) | Flame retardant (Class B2) |
| Acoustic Insertion Loss | High dampening at low-mid frequencies | Good high-frequency absorption | Minimal low-frequency dampening |
| Flexibility & Installation Ease | Exceptional, clean cutting, curves smoothly | Prone to dust, requires masks & metal cladding | Moderate flexibility, stiffer seams |
Each cubic centimeter contains millions of microscopic, non-communicating gas bubbles. This layout locks dry air (a natural insulator) in place while preventing water vapor from diffusing. Unlike open-cell fibers, which absorb ambient moisture and lose their thermal impedance, NBR foam maintains stable thermal performance over its 10-15 year operating life.
Fresh air systems, especially when bringing in hot, humid air during summer, create extreme condensation potentials. Traditional fiberglass insulation requires a thin, fragile foil wrap to act as a vapor barrier. Any tear or puncture in the foil allows water to saturate the fiber, destroying the insulation system. Elastomeric NBR/PVC foam requires no additional cladding because the foam's core resists water throughout its thickness.
Fiberglass can shed respirable glass microfibers, which can cause skin irritation and pose respiratory health risks when introduced to building HVAC air streams. Kingflex's NBR/PVC elastomer is fiber-free and dust-free. This makes it an ideal solution for critical cleanrooms, hospitals, biological laboratories, and premium residential fresh air duct systems.
Kingflex Insulation Co., Ltd. operates as a professional manufacturing and trading combo for high-end thermal insulation products. Located in Dacheng, China—the recognized capital of green building materials—our campus covers advanced R&D labs, warehousing networks, and testing centers.
Established under the Jinwei Group, which has a manufacturing history spanning over 40 years since its founding in 1979, Kingflex carries a deep technical heritage. We were the first thermal insulation manufacturer established north of the Yangtze River, paving the way for China's green-building material revolution.
Our workforce of over 230 production workers, 8 professional R&D engineers, and 6 international trade specialists ensures we deliver quality materials and post-sales support. We provide complete insulation consulting, product design, custom configuration, and installation guidance globally.
We operate 5 large-scale automated continuous vulcanization assembly lines, yielding an annual capacity exceeding 600,000 cubic meters. This scale allows us to easily supply major municipal infrastructure developments, power generation complexes, and chemical processing facilities.
Our thermal and cold insulation systems are exported to over 66 countries. From North America to Southeast Asia, Europe, and the Middle East, our logistics networks ensure timely project deliveries, complete with protective export packaging.
Kingflex practices eco-friendly manufacturing by prioritizing energy-efficient continuous ovens, solvent-recovery loops, and low-VOC formulations. We actively align our production processes with RoHS and REACH standards to support global decarbonization.
Global building codes mandate independent certification of insulation materials to ensure safety and long-term performance. Kingflex undergoes rigorous regular audits and testing to maintain compliance with leading standards, including BS 476, CE, REACH, RoHS, UL94, and ASTM. This guarantees that our insulation systems perform safely under demanding operational conditions.
Our Class 0 rating ensures low flame spread and limited heat release. This performance is critical for public fresh air duct installations, where internal duct linings must not propagate fire or release toxic, dense smoke in emergency scenarios.
Certified to EN 14304 requirements for flexible elastomeric foam products, and tested under ASTM E84 surface burning test methods. This guarantees predictable thermal conductivity, fire performance, and mechanical durability.
Our elastomeric formulas are free from polybrominated diphenyl ethers (PBDEs), ozone-depleting chlorofluorocarbons (CFCs), formaldehyde, and heavy metals. This ensures safe application in hospitals, schools, and offices.
QA specialists verify product cell uniformity, thickness tolerance, and density distribution for every production run.
Modern warehousing facilities support container loading, custom packaging, and global logistics optimization.
We maintain deep, open relationships with engineering partners, offering transparent tracking, traceability codes, and material verification reports. Below are snippets demonstrating our team's close contact with global distributors, engineers, and supply chain managers.
Different engineering contexts present unique physical challenges. Kingflex closed-cell elastomeric systems are formulated to meet these diverse needs, offering targeted solutions for hot, humid coastal areas, ultra-low temperature cryogenic facilities, and high-traffic public institutions.
In humid areas, air conditioning fresh-air ducts run cold while pulling in warm exterior air. Unprotected ducts condensation issues that lead to stained ceiling tiles and mold. Wrapping ducts in Kingflex 19mm - 25mm sheets prevents condensation, helping to maintain dry plenum environments.
Cryogenic piping and liquid gas transmission lines (operating from -40°C down to -200°C) require multi-layered, low-temperature elastomeric foam. This prevents thermal shock, structural metal cracking, and heavy ice buildup, ensuring efficient plant operations.
Rail carriages, ships, and pharmaceutical cleanrooms require non-toxic, flame-retardant materials. Kingflex dust-free and fiber-free products provide clean acoustic and thermal insulation without contaminating airflow loops.
Our standard NBR/PVC formulation is optimized for flat surfaces and large-diameter HVAC ducts.
Pre-formed elastomeric cylinders designed to fit over copper and steel pipes.
We maintain high levels of quality control throughout our manufacturing and shipping operations. View our production and packing areas below:
As green building guidelines prioritize zero-emission materials, Kingflex is actively researching next-generation elastomeric technologies. Our engineering department focuses on three key development paths:
Developing next-gen halogen-free NBR systems that release no corrosive gases or acid vapors during combustion. This makes them ideal for critical shipboard, offshore, and transport operations.
Co-extruding active, non-leaching antimicrobial compounds into the inner lining of fresh air ducts. This inhibits mold growth and keeps HVAC airflow channels sanitary.
Testing NBR-silica aerogel blends that achieve thermal conductivities below 0.028 W/(m·K), allowing for thinner insulation profiles in tight building plenums.
Technical answers to common design, compliance, and application questions.
A1: It is primarily used for insulating HVAC ducts, central air conditioning lines, building envelopes, cold storage facilities, and industrial piping. Its closed-cell structure makes it highly effective at preventing heat gain/loss, controling condensation, and dampening acoustic vibration.
A2: Yes. Kingflex rubber foam is formulated with flame retardants, allowing it to meet rigorous fire safety standards such as BS 476 Part 6/7 (Class 0), UL94 (V-0 rating), and GB 8624 (Class B1). In a fire, it is self-extinguishing and limits flame spread.
A3: Rubber foam is highly flexible, has a closed-cell structure, and resists water vapor penetration. This makes it ideal for chilled lines, fresh air ducts, and humid environments. Rock wool is a rigid, open-cell, fibrous material that withstands very high temperatures, making it better suited for high-temperature steam lines and fire-rated walls.
A4: Yes. We offer comprehensive OEM/ODM services, allowing us to customize dimensions, densities, surface coatings (such as aluminum foil cladding), and adhesive backings to meet specific project needs.
A5: Kingflex products are tested and certified to international standards including BS 476, CE, REACH, RoHS, UL94, and ASTM. This ensures compliance with global building codes and environmental regulations.
A6: Yes. We trace every production run from raw material batches through extrusion and vulcanization. This allows us to track material logs and quality control records for our clients.
A7: We produce sheet rolls in thicknesses ranging from 6mm to 50mm, accommodating various thermal performance requirements.
A8: Under normal operating conditions and with proper installation, our rubber foam insulation has a service life of 10 to 15 years.
Complete product range for extreme-temperature industrial processes, HVAC systems, and architectural installations.
Class 0 fire-rated pipe coverings designed for commercial building mechanical shafts.
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Flexible tubular insulation for refrigeration, air conditioning, and solar thermal loops.
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High-density, structural-grade insulation boards for walls, roofs, and large vessels.
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Cryogenic insulation formulated to maintain flexibility and resist cracking at extremely low temperatures.
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Multi-layered elastomeric barrier systems designed for liquid gas pipelines and ULT facilities.
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High-yield elastomeric rolls that simplify installation on large duct surfaces.
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Color-coded pipes for plumbing line identification, dual-temp lines, and architectural projects.
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High-density elastomeric systems designed to prevent thermal transfer and ambient icing on cryogenic process lines.
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