Kingflex
Engineered Closed-Cell Elastomeric Materials for Plumbing, Drainage, and Cryogenic Piping Applications
Within modern multi-family residential complexes, high-rise office towers, and sensitive healthcare institutions, drain pipe noise transmission represents a critical design challenge. Noise generated from wastewater flow consists of structure-borne vibrations (fluid turbulence hitting the pipe wall) and airborne sound. Without advanced sound insulation, this energy propagates unchecked into adjacent occupied spaces.
Elastic rubber foam insulation solves this problem through the physical mechanisms of damping and decoupling. By wrapping drain pipes in elastomeric materials with a high density (40-55 kg/m³), the pipe wall is dampened, shifting structural resonance frequencies outside the audible spectrum. Furthermore, the closed-cell matrix prevents acoustic energy from exciting adjacent structures, ensuring compliance with local environmental noise bylaws.
Our solutions incorporate NBR/PVC blends engineered specifically to achieve high sound transmission class (STC) ratings and noise reduction coefficients (NRC) for complex pipe layouts.
Forty Years of Heritage, Innovation, and Global Market Leadership in Green Building Materials
Kingflex Insulation Co., Ltd. is a professional manufacturing and trading combo for thermal and acoustic insulation products. Our R&D and manufacturing base is situated in Dacheng, China—widely recognized as the national capital of green building materials. As an energy-saving, environmentally conscious enterprise, Kingflex integrates materials science, advanced polymer production, and global supply chain logistics.
Established by the Jinwei Group, which boasts a heritage dating back to 1979, Kingflex stands as a pioneer. Jinwei Group was the first manufacturer of thermal insulation materials north of the Yangtze River. Today, Kingflex represents the absolute pinnacle of this legacy, delivering thermal, cryogenic, and noise reduction system solutions to global industrial and civil projects.
A corporate structure is only as strong as its technical core. Our R&D department features 8 professional engineers, alongside 6 international logistics and compliance specialists, and 230 highly skilled factory technicians. Our team is dedicated to offering client-focused assistance, from formulation customization to structural installation guidance.
Our products have been exported to more than sixty-six countries over the past 16 years. By maintaining full integration from raw rubber processing to custom slicing and tape adhesive lamination, we eliminate middlemen markups and guarantee batch-to-batch consistency for complex civil works and commercial projects.
Engineered Data Sheets for Black Rubber Foam Insulation Sheets & Pipes
| Performance Characteristic | Rubber Foam Insulation Sheet Roll | Rubber Foam Insulation Pipe | Test Methods & Standard Code |
|---|---|---|---|
| Base Material Blend | Elastomeric NBR / PVC Closed-cell Matrix | Elastomeric NBR / PVC Closed-cell Matrix | ASTM C534 / EN 14304 |
| Foam Cell Structure | Closed-cell rate > 98% | Closed-cell rate > 98% | Microscopic Density Analysis |
| Density Range | 40 - 55 kg/m³ | 40 - 55 kg/m³ | GB/T 6343 / ASTM D1622 |
| Thermal Conductivity | ≤ 0.034 W/(m·k) at 0℃ | ≤ 0.034 W/(m·k) at 0℃ | ASTM C177 / EN 12667 |
| Thickness Availability | 6 mm - 50 mm | 9 mm - 40 mm (ID: 6mm - 114mm) | Standard Metric Vernier Calibration |
| Service Temperature | -40℃ to 105℃ (Special Cryo: -200℃) | -40℃ to 105℃ | ASTM C411 |
| Flame Retardancy | Class 1 / Class 0 (BS 476), V-0 (UL94) | Self-extinguishing, non-dripping | BS 476 Part 6 & 7 / UL 94 |
| Acoustic Insertion Loss | Up to 28 dB(A) attenuation | Up to 32 dB(A) structural damping | ISO 3822 / ISO 15665 |
* Custom formulations with high-density mass loaded vinyl (MLV) barrier backings are available upon request for premium commercial drain sound attenuation applications.
Every batch of Kingflex sound and thermal insulation undergoes strict testing. We hold international certifications including BS 476, CE, REACH, RoHS, UL94, and ASTM. This ensures your project meets environmental, safety, and acoustic standards globally, with full lot traceability from raw polymer to the job site.
Operating from Dacheng, China—the geographic hub of ecological building materials—allows us to access immediate economies of scale. Raw material sourcing, custom chemical compounding, and high-volume extrusion are optimized under one roof, reducing export lead times and minimizing logistics bottlenecks.
We supply structured sound insulation solutions that are easy to customize on-site. Our pre-slit self-adhesive tubes and sheet rolls with customized release liners fit standard pipe sizes, lowering labor costs and reducing the risk of improper installation.
Where materials engineering meets state-of-the-art automation systems
Kingflex runs a dedicated materials laboratory where testing is conducted for closed-cell stability, flame propagation index, and low-frequency sound dampening. Under the supervision of our 8 engineering leads, formulation blends are adjusted to optimize elasticity and resilience. Maintaining a compression resilience of over 80% ensures the insulation retains its shape and structural integrity when installed around elbows, branch pipes, and T-junctions.
Our 5 automated assembly lines process raw NBR/PVC polymers through continuous extrusion and high-temperature expansion ovens. This ensures even micro-cellular foam structures with minimal air void variance, providing consistent thermal resistance and acoustic damping along the entire length of the product.
Verified compliance to satisfy building inspectors and mechanical engineering standards worldwide
Reliable performance in commercial developments and high-stress industrial environments
Our NBR/PVC closed-cell sheet rolls are designed for large-diameter drainage systems, rectangular ductwork, and custom-formed fittings. Featuring an even cell structure and a core density range of 40-55 kg/m³, this material provides stable thermal conductivity and structure-borne sound attenuation.
Primary Applications: Large commercial HVAC duct systems, wall and ceiling insulation, mechanical equipment sound dampening, and chemical process piping.
Designed for fast slip-on installation or retrofitting via longitudinal slitting, our rubber foam pipes provide clean coverage for domestic water lines, chilled water loops, and wastewater drain pipes. The material dampens pipe wall vibrations, reducing the transmission of fluid-flow noise through structural frameworks.
Primary Applications: High-rise apartment soil stacks, hospital wastewater drains, office building HVAC chilled water lines, and chemical processing plants.
Continuous extrusion and vulcanization ensure consistent material quality
Select from our wide range of professional-grade thermal and acoustic insulation materials
Navigating acoustic regulations, sustainable building standards, and raw material trends
Modern building standards, such as LEED, WELL, and local building codes, continue to lower permissible indoor ambient noise levels. Commercial properties are now looking for integrated drain pipe designs that combine acoustic decoupling and thermal barriers in a single product to simplify installation.
Traditional glass wool wraps can settle over time and lose their structural effectiveness when exposed to moisture. By comparison, elastomeric closed-cell foam prevents moisture absorption and maintains its thickness and acoustic performance, even in high-humidity service environments.
While the initial cost of premium elastomeric systems can be higher than simple fiberglass wraps, their resistance to moisture-related rot and physical degradation helps prevent premature performance loss. This provides long-term value for infrastructure and commercial piping systems.
Technical answers regarding elastomeric foam performance, safety ratings, and project specifications
High-performance insulation materials for ultra-low temperature environments and industrial systems
