Kingflex
Engineered rubber foam tubes, sheets, and specialty insulation systems designed to optimize energy efficiency and control condensation.
In modern industrial and building HVAC networks, the selection of insulation thickness is a critical factor determining systemic thermodynamic efficiency, condensation prevention, and long-term operating costs. A 40mm pipe insulation thickness represents a heavy-duty, highly engineered tier typically specified for high thermal-differential environments, extreme humidity zones, and cryogenic processing lines.
By utilizing a synthetic elastomer compound comprised of a specialized Nitrile Butadiene Rubber / Polyvinyl Chloride (NBR/PVC) co-polymer matrix, modern manufacturing creates a micro-cellular structure with closed-cell densities exceeding 98%. This physical structure restricts heat transfer pathways, ensuring a thermal conductivity coefficient (λ) as low as 0.034 W/(m·K) at 0°C. This technical report explores how Chinese manufacturers, led by industry pioneers like Kingflex Insulation Co., Ltd., are utilizing advanced extrusion technology to deliver high-performing 40mm elastomeric systems directly to international contractors and procurement portfolios.
How automation and advanced logistics in China's green-building material capitals are scaling production to meet global B2B infrastructure demands.
Operating out of Dacheng, China—the world-renowned capital of green-building materials—Kingflex utilizes 5 large automatic continuous assembly lines. With an annual production capacity exceeding 600,000 cubic meters, operations are engineered to satisfy massive high-volume infrastructural demands without compromising lead times.
Continuous chemical cross-linking and precise computer-monitored micro-cellular gas expansion guarantee that every batch of 40mm NBR/PVC insulation achieves homogeneous density (40-55 kg/m³) and a consistent thermal profile, meeting the rigorous standards of global engineering companies.
Established as a strategic division of the Jinwei Group—founded in 1979 as the first thermal insulation manufacturer north of the Yangtze River—Kingflex benefits from over four decades of deep-domain research and development, solidifying its place as a trusted name in high-end global distribution networks.
Annual Output
Industry Heritage
Exporting Countries
Closed-Cell Ratio
The transition from traditional thermal barriers to smart, high-performance elastomeric compounds.
Driven by strict environmental and human safety standards (such as REACH and RoHS), the R&D department is focused on halogen-free formulations. Eliminating chlorine and bromine reduces toxic smoke and acid gas output during a fire, making these materials ideal for critical applications like marine vessels, subways, and cleanrooms.
By integrating organic UV-absorbers and anti-oxidants directly into the elastomer matrix during synthesis, our anti-aging rubber foam pipes resist structural breakdown. This technology extends the functional lifespan of 40mm thick insulation on outdoor chilled lines and industrial steam equipment to over 15 years.
Looking ahead, we are incorporating silica aerogel matrices into thin elastomeric sheets. This creates highly efficient, space-saving cryogenic insulation sheets with exceptional thermal resistance, offering reliable thermal protection for LNG systems and ultra-low temperature chemical processing.
Direct specifications for Kingflex black rubber foam sheet rolls and pre-formed pipe insulation systems.
| Parameter Description | Black Rubber Foam Sheet Roll Details | Black Rubber Foam Insulation Pipe Details |
|---|---|---|
| Material Base | Elastomeric Nitrile Butadiene Rubber / PVC Blend | Elastomeric Nitrile Butadiene Rubber / PVC Blend |
| Thickness Range | 6mm to 50mm (Customizable to 40mm) | 9mm to 40mm (Precise pre-formed tubes) |
| Inner Diameter (ID) / Width | Standard widths up to 1.5m | 6mm to 114mm (Accommodates standard pipes) |
| Density Range | 40 - 55 kg/m³ | 40 - 55 kg/m³ |
| Service Temperature Limit | -40℃ to 105℃ (Ultra-low option for Cryogenic) | -40℃ to 105℃ (High-temp steam pipelines) |
| Thermal Conductivity (λ) | ≤ 0.034 W/(m·K) at 0℃ | ≤ 0.034 W/(m·K) at 0℃ |
| Water Vapor Permeability | Excellent resistance (μ ≥ 10,000) | Superior closed-cell moisture seal |
How we ensure global compliance through rigorous batch testing, modern R&D, and internationally recognized certification standards.
Precision Polymer Rheology
Raw Elastomer Synthesis
Microscope Cell Inspection
To facilitate global B2B procurement, our insulation systems hold multiple internationally recognized certifications, ensuring compliance with strict fire safety, toxicity, and environmental standards.
CE Certificate
REACH Testing
UL 94 Flammability
ISO Management
Procurement teams sourcing 40mm pipe insulation from China face a complex set of cost variables. In B2B importing, the nominal cost per meter or roll is influenced by several factors:
Kingflex offers flexible, factory-direct pricing tailored to project requirements. Providing comprehensive engineering data sheets and cost breakdowns helps project managers optimize thermal performance while keeping procurement costs under budget.
Visualizing Kingflex elastomeric systems installed in massive cooling infrastructures, commercial plants, and technical HVAC pipelines.
Get answers to common questions about selecting, specifying, and sourcing 40mm NBR/PVC elastomeric insulation.
Elastomeric rubber foam is a flexible, closed-cell insulation designed to prevent heat transfer and control condensation. Its primary applications include HVAC ductwork, commercial air conditioning piping, refrigeration lines, hot and cold water plumbing, and heavy-duty industrial pipe networks. Its high resistance to moisture vapor makes it ideal for cold systems, where it prevents water ingress and subsequent corrosion under insulation (CUI).
Yes. Our rubber foam insulation is formulated with flame retardants, allowing it to meet rigorous fire safety standards like BS 476 Part 7 (Class 1), UL 94 (V-0 rating), and ASTM E84. In a fire, the material is self-extinguishing, does not drip, and produces low smoke emissions. This helps maintain life safety and complies with local building codes.
The key differences lie in physical structure and application compatibility. Rubber foam features a flexible, closed-cell, moisture-proof structure, making it the preferred choice for HVAC, chilled-water, and cryogenic systems where condensation control is critical. Rock wool, on the other hand, is an open-fiber mineral insulation designed for extremely high temperatures and fireproofing. While rock wool handles higher heat, it requires a separate vapor barrier to prevent moisture absorption.
Yes. We provide complete OEM/ODM services, including customized inner diameters, wall thicknesses (up to 50mm, including standard 40mm specs), custom sheet widths, pre-applied self-adhesive backings, and exterior jackets such as reinforced aluminum foil. These customizations help streamline installation for specific engineering designs.
Our products are certified to global engineering standards, including BS 476, CE, REACH, RoHS, UL94, and ASTM. This comprehensive compliance ensures our materials meet building code, chemical safety, and fire hazard requirements across Europe, the Americas, the Middle East, and Asia.
Yes. Quality control starts at the raw material stage and extends to final packaging. Each production batch is assigned a unique tracking code. This code allows us to trace batch manufacturing parameters, raw material certificates, and quality control test records, ensuring reliable performance in B2B supply chains.
We produce continuous sheet rolls in thicknesses ranging from 6mm up to 50mm. For thicknesses above 32mm, including 40mm and 50mm parameters, our manufacturing process uses a specialized multi-pass vulcanization technique. This ensures a consistent, high-density cell structure throughout the entire thickness of the sheet.
Under typical operating conditions within recommended temperature limits (-40℃ to 105℃) and with proper installation, Kingflex insulation systems provide a service life of 10 to 15 years. Applying specialized protective coatings or weather-resistant outer jackets can further extend this lifespan, especially in challenging outdoor or marine environments.
Explore our complete range of specialized insulation materials, designed for high thermal efficiency and long-term durability.
