Kingflex
Kingflex
Explore our premium grade elastomeric rubber foam insulation rolls, tubes, and boards engineered for maximum thermal retention and energy savings.
In modern high-performance commercial and industrial building envelopes, the return air duct is much more than a passage for exhaust air. As HVAC technology strives toward carbon-neutral operations, optimizing return air paths has become a primary target. Inadequate return air duct insulation leads to structural thermal bridging, moisture condensation, mold colonization, and massive energy efficiency losses.
Historically, low-performance fibrous insulation blankets like fiberglass dominated standard construction. However, standard fiberglass blankets are prone to moisture ingress, which causes fiber degradation and indoor air quality issues. Modern building standards now require closed-cell elastomeric rubber foam technology. This structure features independent cells containing dry air, which forms a built-in water vapor barrier. This barrier maintains thermal integrity over decades of operation without the risk of microbial growth or thermal breakdown.
Kingflex Insulation Co., Ltd. is a leading manufacturer of high-performance thermal and acoustic insulation products. Our R&D and manufacturing facility is located in Dacheng, China—the nationally recognized hub for green building materials. Kingflex operates as an energy-saving, environmentally conscious enterprise that integrates product formulation development, large-scale manufacturing, international trading, and installation consulting services.
Established by the prestigious Jinwei Group, which boasts a rich heritage dating back to 1979, Kingflex stands on over 40 years of thermal insulation expertise. As the first insulation manufacturer established north of the Yangtze River, Jinwei Group paved the way for advanced polymer material engineering in China. Today, Kingflex carries this legacy forward, providing tailored insulation solutions for some of the world's most demanding architectural and industrial projects.
Annual Production Capacity
Automatic Assembly Lines
Industry Heritage
Global Export Footprint
Continuous investment in automation, molecular chemistry, and fire safety systems allows us to maintain a leading position in global insulation production.
Our R&D team consists of 8 expert materials science engineers. They focus on improving the polymer matrix to lower thermal conductivity and increase flame retardancy. This team holds several patents in elastomeric closed-cell foaming techniques.
With 5 highly automated, continuously monitored production lines, we ensure uniform thickness and consistent cell structure. This high-capacity setup has earned us designated supplier status from the Ministry of Energy and the Ministry of Chemical Industry.
Our workforce features 230 skilled production technicians, along with a dedicated international trade and support division of 6 multilingual sales engineers. We ensure clear communication, standard compliance checkups, and on-time international delivery.
In structural and industrial insulation, certifications are critical for ensuring safety. Kingflex products undergo regular testing to meet strict international standards for fire safety, environmental health, and chemical safety.
Our materials are certified to meet major international standards, including BS 476 (Class 0 and Class 1), CE (Conformité Européenne), REACH, RoHS, UL94, and ASTM testing criteria. These certifications guarantee that our elastomeric rubber foam does not emit toxic smoke or support flame spread during a fire, making it safe for hospitals, schools, and commercial high-rises.
Every batch of Kingflex rubber foam is traceable. Standard barcodes and production numbers allow complete traceability from raw material selection to field installation, ensuring reliability at every stage.
| Physical Property | Elastomeric Sheet Roll Specification | Elastomeric Pipe Specification | Testing Standards Reference |
|---|---|---|---|
| Material Base | Premium NBR / PVC Polymer Blend | Premium NBR / PVC Polymer Blend | ASTM C534 Type I & II |
| Thickness Range | 6mm to 50mm | 9mm to 40mm | Standard Production Scale |
| Inner Diameter (ID) | N/A (Flat Sheet Format) | 6mm to 114mm | Fits Standard Copper/Steel Pipes |
| Core Density | 40 to 55 kg/m³ | 40 to 55 kg/m³ | ASTM D1622 / ISO 845 |
| Service Temperature Limit | -40°C to 105°C | -40°C to 105°C | ASTM C411 |
| Thermal Conductivity (λ) | ≤ 0.034 W/(m·K) at 0°C | ≤ 0.034 W/(m·K) at 0°C | ASTM C518 / ISO 8301 |
| Moisture Resistance (μ) | ≥ 10,000 (Closed cell rate ≥ 98%) | ≥ 10,000 (Closed cell rate ≥ 98%) | BS EN 12086 / DIN 52615 |
| Fire Safety Rating | Class 0 / Class 1 / V-0 | Class 0 / Class 1 / V-0 | BS 476 Part 6 & 7 / UL 94 / GB 8624 |
From architectural mechanical rooms to highly sensitive cleanrooms and sub-zero cryogenic systems, Kingflex provides optimized thermal isolation.
Ideal for large-diameter flat surfaces, rectangular duct linings, and large tanks.
Designed for quick installation over copper, steel, and PVC piping systems.
Explore our manufacturing processes, including raw material processing, chemical foaming, automated cutting, quality testing, and container loading.
Discover our range of insulation materials, including elastomeric pipes and rolls, high-temperature rock wool blankets, and soundproofing boards.
As a leading supplier of thermal and acoustical insulation, Kingflex provides comprehensive design and engineering support. We assist project managers, HVAC designers, and insulation contractors with material selection, technical compliance, and installation guidelines.
We work closely with clients to address critical engineering challenges, including condensation control in high-humidity regions, fire safety in commercial zones, and thermal protection in cryogenic applications. Our team helps optimize material specifications to balance performance and project budget constraints.
Our logistics and delivery systems are designed to support fast-track construction schedules. We maintain safety stock of standard thickness options to ensure rapid dispatch, and provide complete documentation including test certificates and container loading lists.
Find answers to common questions about elastomeric rubber foam specifications, fire safety certifications, installation guidelines, and custom manufacturing options.
Complete your design requirements with our advanced range of low-temperature elastomeric products and structural rubber foam tubes.
