Kingflex
Explore our leading elastomeric foam sheets, rolls, and custom pipeline insulation engineered for superior thermal protection and anti-condensation.
In modern industrial, commercial, and residential building architectures, the efficiency of HVAC (Heating, Ventilation, and Air Conditioning) networks is a critical metric for both environmental sustainability and thermal comfort. Duct networks act as the circulatory system of a building structure. Without proper insulation—referred to in global engineering as Isolant Pour Tuyau De Ventilation—these networks suffer massive energy degradation, acoustic amplification, and persistent condensation risks that lead to mold growth and compromised indoor air quality (IAQ).
This technical white paper details the physical, thermal, and mechanical performance parameters of closed-cell elastomeric rubber foam insulation manufactured by Kingflex Insulation Co., Ltd. Backed by over 40 years of industry experience through the Jinwei Group (est. 1979), Kingflex delivers high-performance NBR/PVC-based insulation solutions designed to meet the rigorous international fire, acoustic, and thermal criteria required by modern construction projects globally.
The global demand for high-efficiency ventilation duct insulation is driven by strict energy codes, including ASHRAE 90.1, International Energy Conservation Codes (IECC), and European Standards (EN 14304). The French construction standard (RT 2020 / RE 2020) places high emphasis on the decarbonization of buildings, highlighting the need for efficient "Isolant Pour Tuyau De Ventilation". As cleanrooms, data centers, and advanced commercial high-rises expand worldwide, the selection of insulation materials has shifted from traditional open-cell materials like fiberglass to closed-cell elastomeric materials to eliminate moisture penetration and particulate shedding.
Closed-cell structures yield extremely low and stable thermal conductivity (λ ≤ 0.034 W/m·K at 0°C), significantly minimizing energy transfer through duct walls.
With an inherent moisture resistance factor (μ ≥ 10,000), elastomeric foam does not require an external vapor barrier, eliminating risks of corrosion under insulation (CUI).
Exhibits self-extinguishing capabilities and complies with BS 476, Class 0, UL94, and European fire rating standards, preventing rapid flame propagation in high-velocity air shafts.
Kingflex Insulation Co., Ltd. is a dedicated manufacturer and trade combo specializing in thermal and cold insulation systems. Established as a member of the Jinwei Group, which has a manufacturing history dating back to 1979, we are pioneers of energy-saving technology north of the Yangtze River. Operating with the philosophy of "energy saving and consumption reduction as the core concept," we serve the global construction, chemical, and aerospace industries.
Our state-of-the-art production base in Dacheng, China, features 5 large automatic assembly lines capable of yielding over 600,000 cubic meters of high-quality elastomeric insulation annually. This massive scale makes Kingflex a designated manufacturing partner for the Ministry of Energy, the Ministry of Electric Power, and the Ministry of Chemical Industry.
Our NBR/PVC closed-cell elastomeric foam is formulated for extreme durability, chemical stability, and wide operating temperature parameters.
| Parameter | Elastomeric Foam Sheets & Rolls | Elastomeric Foam Pipes / Tubes |
|---|---|---|
| Material Formulation | Nitrile Butadiene Rubber (NBR) / Polyvinyl Chloride (PVC) Blend | Nitrile Butadiene Rubber (NBR) / Polyvinyl Chloride (PVC) Blend |
| Standard Thickness | 6mm to 50mm | 9mm to 40mm |
| Internal Diameter (ID) | N/A (Roll / Sheet Form) | 6mm to 114mm |
| Density Range | 40 - 55 kg/m³ | 40 - 55 kg/m³ |
| Service Temperature Range | -40℃ to 105℃ (Cryogenic options down to -200℃) | -40℃ to 105℃ (Cryogenic options down to -200℃) |
| Thermal Conductivity (λ) | ≤ 0.034 W/(m·K) at 0℃ | ≤ 0.034 W/(m·K) at 0℃ |
| Closed-Cell Rate | > 98% uniformly foamed micro-cells | > 98% uniformly foamed micro-cells |
| Compression Resilience | Over 80% recovery rate | Over 80% recovery rate |
While rock wool and glass wool have historically been used for insulation, they are highly susceptible to moisture ingress. When moisture enters an open-cell system, its thermal conductivity rises exponentially since water conducts heat roughly 25 times faster than dry air. The closed-cell structure of Kingflex rubber foam prevents moisture from entering, maintaining its thermal conductivity over an operational lifespan of 10 to 15 years.
Furthermore, fiber-free rubber foam eliminates the risk of airborne micro-fiber shedding, a critical requirement in sterile environments like hospitals, microelectronics factories, and cleanrooms.
Engineered to perform in demanding commercial, industrial, and maritime ventilation environments.
Used to wrap rectangular and circular sheet metal ductwork in office complexes, retail centers, and hospitals. Prevents condensation and dripping above ceiling spaces while absorbing low-frequency mechanical noise.
Designed for chemical processing plants, hot water systems, and steam systems. Provides thermal insulation and corrosion protection for high-temperature pipelines operating up to 105°C.
Our specialized cryogenic rubber foam prevents thermal shock and condensation in cold-chain storage facilities, liquefied gas pipeline infrastructure, and low-temperature process cooling networks.
When warm, humid ambient air contacts an uninsulated duct transporting cooled air, moisture will condense. If left unchecked, this moisture damages ceilings, ruins electrical equipment, and promotes toxic mold growth inside walls. Kingflex rubber foam sheets and rolls provide a continuous, high-resistance path against moisture ingress. The foam's integrated structure ensures the surface temperature remains above the ambient dew point, keeping ventilation systems dry and functional.
Backed by testing and international certifications ensuring safety, compliance, and environmental responsibility.
At Kingflex, quality control is integrated into every stage of the manufacturing process. Our R&D department features 8 professional engineers, working alongside our QA specialists to test every batch of NBR/PVC raw materials. We utilize advanced extrusion and foaming equipment to maintain cell consistency, density, and thickness tolerance.
Our solutions comply with global quality standards, ensuring smooth customs processing and certification compliance on international construction sites. Our certifications include:
Our insulation systems have been deployed across 66 countries in key commercial and industrial sectors.
Our thermal and cold insulation systems are regularly specified for civil construction, petrochemical plants, district cooling pipelines, and marine vessels. The flexibility of our NBR/PVC elastomer allows for quick installation on-site. It cuts cleanly and wraps around bends, valves, and branches without cracking, reducing labor costs and installation times.
Below is a selection of real-world installation projects showcasing Kingflex elastomeric insulation sheets and pre-formed tubes applied to HVAC ventilation lines, chilled water mains, and industrial headers.
Providing clear technical consultation and responsive manufacturing updates to our global partners.
We work closely with HVAC design engineers, insulation contractors, and material distributors to ensure our products match specific project requirements. Below are communications showing our collaborative approach to quality control, delivery logistics, and product customization.
Answers to common engineering questions regarding the performance and selection of elastomeric insulation.
Browse our secondary catalog of specialty low-temperature, soundproofing, and industrial rubber foam configurations.
