Explore our elite range of flexible rubber foam insulation tubes and sheets engineered for maximum thermal efficiency and structural resilience.
In the modern landscape of mechanical engineering and HVAC-R construction, thermal efficiency is not merely an option—it is a regulatory and economic mandate. Flexible elastomeric foam, primarily formulated from a synthesized blend of Acrylonitrile Butadiene Rubber (NBR) and Polyvinyl Chloride (PVC), represents the pinnacle of standard insulation technology.
The secret behind its performance lies in its microscopic structure. With a closed-cell rate exceeding 98%, the material encapsulates millions of independent micro-vacuoles containing dry air. Because air is a poor conductor of heat and molecular circulation is restricted within these tiny sealed bubbles, the thermal conductivity ($\lambda$) remains consistently low ($\le 0.034 \text{ W/(m}\cdot\text{K)}$ at $0^\circ\text{C}$).
Furthermore, this closed-cell matrix serves as a built-in water vapor barrier, achieving an extremely high moisture resistance factor ($\mu \ge 10,000$). Traditional open-cell insulations, such as fiberglass or rock wool, rely on external vapor barriers that are easily punctured, leading to condensation, thermal bridging, and structural rot. NBR/PVC rubber foam eliminates this critical point of failure, maintaining its performance for a service life of 10 to 15 years.
Under the stewardship of the Jinwei Group, we have engineered and exported high-tier insulation since 1979.
Kingflex Insulation Co., Ltd. is a premium manufacturing and trading combo specializing in thermal insulation products. Our research, development, and state-of-the-art production base are strategically situated in Dacheng, China—widely recognized as the green-building materials capital of the region. As an energy-saving, environmentally conscious enterprise, Kingflex integrates advanced R&D, streamlined manufacturing, and expert post-sale services.
Established by the Jinwei Group (which boasts more than 40 years of market presence since its founding in 1979), Kingflex inherits a legacy of being the very first thermal insulation material manufacturer north of the Yangtze River. Today, we supply custom configurations to blue-chip EPC contractors and HVAC global distributors, offering integrated solutions for thermal insulation, cryogenic protection, and acoustic attenuation.
Our workforce is the cornerstone of our global reliability. At Kingflex, we operate a highly specialized team focused on delivering consistent, first-class service to clients across the commercial, industrial, and municipal building sectors.
Our infrastructure is backed by 8 professional chemical and mechanical engineers in our R&D Department who drive breakthroughs in halogen-free configurations and cryogenic flexible elastomers. The department works in lockstep with 6 international sales consultants and 230 technicians on the manufacturing floor to maintain a seamless order-to-delivery lifecycle.
A look into our 5 large-scale automated assembly lines and specialized testing facilities.
At present, Kingflex operates 5 large-scale automatic continuous assembly lines with an annual capacity exceeding 600,000 cubic meters. This immense scale has secured our designation as a trusted, primary manufacturing vendor by the Ministry of Energy, the Ministry of Electric Power, and the Ministry of Chemical Industry in China.
Each production run is monitored using digital thickness calibrators and inline thermal analyzers to ensure strict compliance. Our materials undergo rigorous thermal conductivity, smoke density, and flame spread testing before receiving batch release certification.
Uncompromising safety and environmental compatibility certified by world-recognized authorities.
BS 476 Class 0 / Class 1
CE EN 14304
UL 94 Flammability
ISO 9001:2015
Navigating international building regulations requires manufacturers to hold robust, verifiable certification. Kingflex elastomeric materials have successfully passed the requirements of BS 476 Part 6 & 7 (rendering them Class 0/Class 1 compliant), UL 94 (V-0 flame rating), and ASTM C534/E84. For environmental and consumer safety, our entire product portfolio conforms to European Union REACH and RoHS directives, ensuring zero ozone-depleting potential (ODP) and zero global warming potential (GWP).
Comprehensive product parameters for engineering procurement departments.
Engineered for large-diameter pipes, ductwork, flat tanks, and irregular geometries. The elastic nature of the NBR/PVC blend allows for seamless conformity to metal surfaces, minimizing air gaps.
| Property | Standard Value |
|---|---|
| Material Composition | NBR/PVC Elastomeric Foam Blend |
| Available Thickness | 6mm, 9mm, 13mm, 19mm, 25mm, 32mm, 40mm, 50mm |
| Density Range | 40 - 55 kg/m³ |
| Service Temp Limit | -40℃ to +105℃ |
| Closed Cell Rate | > 98% |
| Water Vapor Permeability | $\le 2.8 \times 10^{-11} \text{ g/(m}\cdot\text{s}\cdot\text{Pa)}$ |
Designed specifically for direct slip-on installation for copper piping, galvanized steel, and plastic HVAC conduits. Reduces installation time by over 50% compared to mineral wool wraps.
| Property | Standard Value |
|---|---|
| Material Composition | NBR/PVC Elastomeric Foam Blend |
| Available Thickness | 9mm, 13mm, 19mm, 25mm, 32mm, 40mm |
| Internal Diameter (ID) | 6mm to 114mm (Custom Sizes Available) |
| Density Range | 40 - 55 kg/m³ |
| Service Temp Limit | -40℃ to +105℃ |
| Fire Rating | Class B1 (GB8624), Class 0 (BS476) |
Selected structural applications demonstrating the reliability of our thermal solutions in the field.
Our products have been specified for diverse building projects, including industrial chemical processing centers, multi-phase district heating grids, pharmaceutical cold-chain facilities, and high-rise commercial structures. Kingflex's NBR/PVC closed-cell structure prevents moisture absorption, ensuring long-term thermal resistance and mechanical protection against corrosion under insulation (CUI).
Decentralizing geographical supply risk through direct integration with China's largest industrial insulation cluster.
Located in the heart of China’s green-building material cluster, we benefit from consolidated raw material logistics, local polymer supply chains, and specialized industry labor, keeping our production costs highly competitive.
Our proximity to major northern maritime ports ensures weekly container allocations, optimized inland freight, and rapid customs clearance, allowing us to maintain efficient shipping schedules to global hubs.
We provide full customization, supporting bespoke wall thicknesses, inner diameters (ID), integrated color codings, self-adhesive backings, and aluminum cladding options to meet specific project guidelines.
Verified order logs, shipping documentation, and partner chat transcripts reflecting 100% transparency.
In-depth technical answers addressing fire safety, temperature limits, and product customization.
Select the appropriate product category for your bulk quotation request.
Flexible closed-cell NBR/PVC elastomeric tube, roll, and custom sheets for high-performance moisture control and thermal insulation.
Lightweight fiberglass wraps and blankets for high-temperature acoustic panels and structural ceiling thermal backings.
High-density mineral fiber blocks, blankets, and rigid sleeves designed for industrial steam mains and fire-rated walls.
Browse additional products below to complete your system requirements.
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