Engineered for fire safety, low thermal conductivity, and outstanding moisture barrier properties.
In modern industrial and commercial construction, the choice of thermal insulation materials is directly linked to fire safety, energy efficiency, and operational lifespan. Class O Insulation represents the gold standard in fire-retardant performance under international building codes, particularly conforming to the British Standard (BS 476). BS 476 Part 6 (Fire Propagation Index I ≤ 12, sub-index i1 ≤ 6) and Part 7 (Class 1 Surface Spread of Flame) establish strict criteria that insulation must meet to restrict the flame spread and minimize heat release in critical environments.
Kingflex Insulation Co., Ltd. has developed high-performance elastomeric NBR/PVC closed-cell foam solutions that naturally comply with these rigorous ratings. By optimizing the polymer matrix, integrating non-halogenated flame retardants, and enforcing a cross-linked structure that maintains over 98% closed cells, Kingflex products successfully prevent fire spread while keeping thermal conductivity exceptionally low (λ ≤ 0.034 W/m·K at 0°C). This technical paper serves as a comprehensive guide for global procurement departments, engineering consultancies, and EPC contractors seeking high-grade, code-compliant Class O insulation products direct from a leading Chinese manufacturing complex.
Kingflex Insulation Co., Ltd. stands as a premier manufacturer and comprehensive trading combo for premium thermal insulation systems. Our central research, development, and state-of-the-art production complex is situated in Dacheng, China—the recognized capital of green-building materials. As an energy-saving, environmentally friendly enterprise, we specialize in the complete product life cycle: from molecular polymer R&D to specialized extrusion, distribution, and global post-sale service.
Our founding roots stem from the prestigious Jinwei Group (also known as Kingway Group), established in 1979 as the pioneering manufacturer of thermal insulation materials north of the Yangtze River. Backed by over 40 years of industrial heritage, Kingflex operates with energy saving and consumption reduction as our primary developmental guidelines. Today, we supply custom insulation solutions across more than 66 countries, servicing high-spec project sites globally.
A history of industrial leadership combined with professional human resources and certified excellence.
At Kingflex, technical capability is anchored by a close-knit group of industry experts. Our dedicated staff consists of 8 senior research and development engineers specializing in polymer chemistry, 6 dedicated international trade consultants, and 230 highly trained manufacturing technicians operating our automated production lines.
Our commitment to quality is validated by third-party testing and verified performance certificates. Our products systematically pass international tests, including BS 476, CE, REACH, RoHS, UL94, and ASTM standards. This guarantees that every cubic meter of foam leaving our facility conforms to the environmental and health codes required in the European Union, Middle East, and the Americas.
How we leverage advanced automation, resource allocation, and logistics to secure global projects.
We operate 5 high-speed automated extrusion lines running on proprietary temperature-control profiles. This system ensures consistent cell density, uniform wall thickness, and precise control over the vulcanization process, eliminating internal voids and structural variance.
Quality assurance is backed by our strict batch-traceability system. Each shipment, sheet roll, and tube package is coded back to raw material inputs, processing parameters, and R&D testing data, meeting the strict requirements of international EPC companies.
Our location in Dacheng offers direct access to key industrial shipping corridors, allowing us to rapidly dispatch large volumes to major Chinese container ports (such as Tianjin Port). This minimizes shipping delays and optimizes delivery timelines for global infrastructure projects.
Our elastomeric NBR/PVC closed-cell foams provide thermal efficiency and condensation protection across diverse industries.
Installed directly on chilled water lines, air conditioning ducts, and ventilation shafts to limit heat gain and prevent condensation. The Class O rating guarantees high fire safety in commercial buildings, public hospitals, and high-rise developments.
Protects steam lines, process piping, and storage tanks in chemical complexes. Kingflex NBR/PVC compounds resist chemical vapors, ozone, and structural weathering, ensuring stable insulation in harsh processing environments.
For ultra-low temperature applications (LNG shipping, cryogenic lines, gas separation plants), Kingflex provides specially engineered low-temp systems. This foam retains flexibility and resists micro-cracking at extremely low temperatures.
Below are the physical and thermodynamic parameters of our standard and high-performance elastomeric products. For custom projects, contact our engineering department.
| Property | NBR/PVC Elastomeric Foam Sheet | NBR/PVC Elastomeric Foam Tube | Test Standard Reference |
|---|---|---|---|
| Service Temperature | -40 °C to 105 °C | -40 °C to 105 °C | ASTM C534 / EN 14706 |
| Thermal Conductivity (λ) | ≤ 0.034 W/m·K at 0 °C | ≤ 0.034 W/m·K at 0 °C | ASTM C177 / EN 12667 |
| Closed-Cell Rate | ≥ 98% | ≥ 98% | GB/T 10799 |
| Density | 40 - 55 kg/m³ | 40 - 55 kg/m³ | ASTM D1622 / EN 1602 |
| Fire Safety Rating | Class O (BS 476 Pt 6 & 7) / Class 0 | Class O (BS 476 Pt 6 & 7) / Class 0 | BS 476 Part 6/7 / UL 94 V-0 |
| Moisture Resistance (μ) | ≥ 10,000 | ≥ 10,000 | EN 12086 / ASTM E96 |
Continuous innovation in material science to meet global sustainability targets and carbon neutrality.
At Kingflex, we continue to innovate within our specialized R&D center. Our research focus is directed at three core fields to meet emerging global standards:
Supplying critical building projects, commercial structures, and industrial complexes worldwide.
We work closely with global engineering consultants and procurement partners. By maintaining clear lines of communication, sharing production updates, and providing technical documentation, we have built long-term relationships with clients in major infrastructure hubs.
Our customers depend on our quick response times and technical assistance, ensuring that every project is supplied with insulation that meets all local building and safety regulations.
Real-world installations showing our thermal insulation performance and system durability.
Kingflex Standard Dimension:
Material: NBR/PVC
Thickness: 6mm - 50mm
Density: 40 - 55 kg/m³
Service Temp: -40 °C to 105 °C
Key Advantages: Foams evenly and fully, closed-cell rate over 98%, excellent thermal insulation. Full closed-cell structure guarantees low moisture absorption and stable thermal conductivity. Flame retardant and self-extinguishing.
Applications: Central air conditioning ducts, wall/roof thermal insulation, anti-condensation for water pipes, industrial process lines, and noise reduction for mechanical rooms.
Kingflex Standard Dimension:
Material: NBR/PVC
Thickness: 9mm - 40mm
Inner Diameter (ID): 6mm - 114mm
Density: 40 - 55 kg/m³
Service Temp: -40 °C to 105 °C
Key Advantages: High-precision manufacturing ensures uniform wall thickness. Flexible closed-cell configuration prevents condensation and pipe corrosion. Excellent compression resilience helps absorb line vibrations.
Applications: Chilled water pipes, hot water supply lines, refrigeration pipes, chemical plant process conduits, and solar heating loops.
With 40+ years of manufacturing experience, Kingflex delivers certified quality, large-scale production, and reliable logistics for complex projects worldwide.
Technical answers to common questions about Class O elastomeric foam insulation.
It is mainly used for HVAC ducts, air conditioning pipes, building thermal insulation, industrial pipeline cold insulation, and sound insulation. Its closed-cell structure prevents moisture ingress, protecting systems from corrosion under insulation (CUI) and energy loss.
Yes, our rubber foam insulation products are flame retardant and self-extinguishing. They meet strict international safety standards, including BS 476 Class O and UL 94 V-0 ratings, making them suitable for high-occupancy commercial and industrial projects.
Rubber foam is flexible, closed-cell, and highly moisture-resistant, making it ideal for HVAC, plumbing, and low-temperature applications where condensation control is key. Rock wool is high-temperature resistant and fireproof, suited for industrial high-temperature pipelines and structural fireproofing.
Yes, we provide comprehensive OEM and ODM services. We customize thickness, inner diameters, density, color, and adhesive backings to meet the specific requirements of your project.
Our products have passed BS 476, CE, REACH, RoHS, UL94, and ASTM testing, ensuring compliance with global environmental, safety, and performance standards.
Yes, Kingflex products have full traceability. Every production batch is logged with material inputs and QC test results, allowing us to trace quality records from raw material to final shipment.
We can produce thicknesses from 6mm to 50mm to meet different thermal efficiency requirements.
Under standard operating conditions and proper installation, our rubber foam products have a service life of approximately 10 to 15 years.
Our formulation is based on a Nitrile Butadiene Rubber (NBR) and Polyvinyl Chloride (PVC) blend. This combination provides flexibility, low thermal conductivity, and durability, which is reinforced with flame retardants to achieve the Class O rating.
We perform quality checks at every step of production. Random samples from each production run undergo laboratory testing for thermal conductivity, water vapor permeability, and density before packaging and shipping.
Explore our full catalog of tubes, sheet rolls, cryogenic systems, and acoustic boards.
Contact Kingflex to request physical samples, detailed technical data sheets, and custom quotes tailored to your project requirements.
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