Kingflex
Select from our globally certified range of elastomeric NBR/PVC sheets, rolls, and pre-formed pipe sections.
The global industrial and architectural landscape is undergoing an intensive transformation toward systemic energy efficiency and acoustic optimization. Sound absorbing rubber—historically categorized as a niche dampening component—has emerged as a foundational building material. As modern urban centers densify and industrial regulations tighten, managing sound pollution and thermal transfer in high-capacity heating, ventilation, and air conditioning (HVAC) systems has become a priority.
Modern acoustic elastomeric foam operates at the intersection of material science and building economics. Traditional insulation materials, such as rock wool or glass fiber, suffer from fiber migration, structural compaction, and moisture absorption over time. These issues degrade their acoustic performance and compromise indoor air quality. By contrast, closed-cell NBR/PVC (nitrile butadiene rubber/polyvinyl chloride) structures provide long-term physical stability, cleanroom compliance, and consistent thermal-acoustic performance.
Kingflex Insulation Co., Ltd. is a professional manufacturing and trading combo for thermal insulation products. Our advanced research, development, and primary production divisions are situated in Dacheng, China—a hub for energy-saving green building materials. As an energy-saving, environmentally friendly enterprise, we center our corporate mission on the research, development, production, and sale of advanced insulation materials.
In our operations, Kingflex prioritizes energy conservation and consumption reduction as core concepts. We provide end-to-end insulation systems through consultation, targeted R&D, advanced manufacturing, installation guidance, and dedicated post-sale support, helping shape the global building materials landscape.
Kingflex was established by the Jinwei Group, which has a legacy spanning over 40 years. Founded in 1979, the Jinwei Group was the first manufacturer of thermal insulation materials north of the Yangtze River, paving the way for decades of technological expertise and market leadership in industrial insulation.
Understanding how closed-cell micro-structures absorb, dampen, and isolate sound waves across industrial bandwidths.
When sound waves strike the NBR/PVC elastomer matrix, they initiate structural vibrations. The polymer chain network converts this mechanical vibrational energy into heat through internal friction (hysteresis). This process limits structure-borne noise in mechanical ducts and machinery casings.
Our formulation yields a closed-cell rate exceeding 98%. Thousands of micro-cells trap air pocket barriers, reducing sound transmission while keeping moisture out. This prevents the degradation of thermal properties caused by water ingress.
By combining high density (40-55 kg/m³) with high flexibility, our materials shift the resonant frequency of light metal ducts. This dampens secondary structural vibrations and reduces system noise.
| Property Matrix | Kingflex Elastomeric NBR/PVC | Conventional Fiberglass / Rockwool | Standard EPDM Sponge |
|---|---|---|---|
| Acoustic Performance (NRC) | 0.65 - 0.85 (Thickness-dependent) | 0.70 - 0.90 (Degrades if wet) | 0.45 - 0.60 |
| Thermal Conductivity (0°C) | ≤ 0.034 W/(m·K) | 0.038 - 0.045 W/(m·K) | 0.039 - 0.042 W/(m·K) |
| Moisture Resistance Factor (μ) | ≥ 10,000 (Built-in vapor barrier) | No built-in resistance | 7,000 - 8,500 |
| Fire Classification | BS 476 Part 7 Class 1 / Part 6 Class 0 | Non-combustible | UL94 HBF - V1 |
| Service Temperature Limit | -40°C to 105°C | Up to 650°C | -50°C to 120°C |
| Fiber Migration | Zero (Dust-free & cleanroom safe) | High (Requires protection) | Zero |
Our technical team consists of skilled engineers and material scientists dedicated to meeting international building codes.
Our team is composed of dedicated individuals with a shared goal of delivering consistent, high-quality service. Kingflex employs eight professional engineers in our R&D Department, six international sales professionals, and 230 workers in our production department.
This operational framework allows us to maintain strict quality standards, adjust product properties for specific regional requirements, and provide direct technical support to global distributors and engineering firms.
Kingflex maintains ISO 9001 and ISO 14001 management systems. Our production lines feature continuous density controls, automated vulcanization, and real-time thickness profiling. These systems ensure that every roll, sheet, and pipe matches our technical specifications.
Tested and verified by independent global classification societies to meet safety, environmental, and thermal-acoustic standards.
BS 476 Fire Test Compliance
CE European Conformity
ISO 9001 System Approval
UL94 Fire Safety Rating
Our products hold international certifications including BS 476, CE, REACH, RoHS, UL94, and ASTM. This ensures our acoustic and thermal insulation materials meet global project compliance standards.
Establishing commercial trust requires transparency and verifiable performance. We maintain direct, open communication channels with engineering partners, HVAC contractors, and material specifiers across all target regions.
Our project materials include traceable batch manufacturing records, verified raw material inputs, and clear shipping updates. These systems help ensure shipments arrive on site in compliance with all relevant specifications.
Real customer communications show our commitment to quality, product traceability, and delivery schedules.
Detailed physical dimensions and performance tolerances for Kingflex rubber foam sheets, rolls, and pipes.
Material Structure: NBR/PVC Elastomer
Available Thicknesses: 6mm to 50mm
Nominal Density: 40 to 55 kg/m³
Thermal Range: -40℃ to 105℃
Closed Cell Ratio: ≥ 98%
Compression Resilience: ≥ 80%
Performance Advantages: Designed for even foaming and consistent density. Closed-cell structure provides low moisture absorption and stable, long-term thermal conductivity. Built-in fire retardants support self-extinguishing properties.
Material Structure: NBR/PVC Elastomer
Wall Thicknesses: 9mm to 40mm
Inner Diameters (ID): 6mm to 114mm
Nominal Density: 40 to 55 kg/m³
Thermal Range: -40℃ to 105℃
Vapor Resistance: High μ factor
Performance Advantages: Continuous extrusion and vulcanization yield precise inner diameters and wall thicknesses. These dimensions provide a tight fit on copper and steel pipes, reducing the risk of pipe freezing and corrosion under insulation (CUI).
Kingflex systems installed across global commercial and industrial sites.
An overview of cost structures, raw material dynamics, and global volume pricing models.
Navigating global procurement for NBR/PVC elastomeric foam requires an understanding of the key cost drivers. The pricing of sound-absorbing rubber insulation is not arbitrary; it fluctuates based on raw material costs, manufacturing metrics, and customization choices.
For large-scale industrial projects and wholesale distribution agreements, we use a structured pricing framework:
| Insulation Type | Thickness Range | Estimated FOB China (USD/m³) |
|---|---|---|
| Standard NBR/PVC Sheets | 6mm - 25mm | Request Quote |
| Self-Adhesive + Foil Facing | 10mm - 50mm | Request Quote |
| Class 0 Fire-Resistant Pipes | 9mm - 40mm | Request Quote |
*Prices vary based on raw material market rates, project volume, and custom specifications.
Answers to technical and commercial questions about elastomeric sound absorbing and thermal insulation systems.
It is primarily used for HVAC duct systems, air conditioning pipes, building thermal insulation, industrial process piping (both hot and cold lines), and specialized machinery noise damping. Its dual thermal-acoustic properties make it suitable for preventing condensation on cold lines while reducing operational system noise.
Yes. Kingflex rubber foam is formulated with fire-retardant additives to meet international safety standards, including BS 476 Part 6 & 7 (Class 0 and Class 1), UL94 V-0/V-1, and ASTM flammability testing. In the event of a fire, the material is designed to be self-extinguishing and will not produce flaming droplets.
Rubber foam features a flexible, closed-cell structure that inherently resists moisture vapor transmission without requiring an external vapor barrier. This makes it ideal for cold lines and high-humidity environments. Rock wool is a high-temperature fibrous material suitable for heavy industrial heat applications. However, it lacks moisture resistance and can shed fibers, making it less suitable for cleanroom environments.
Yes. We support custom dimensions, thicknesses, adhesives, and facings. We can adjust the formulation's density and flame-retardant properties to meet specific project guidelines, architectural requirements, or regional safety codes.
Our materials are certified under BS 476, CE, REACH, RoHS, UL94, and ASTM. This compliance portfolio allows our materials to be specified for commercial and industrial projects in Europe, the Americas, Asia-Pacific, and the Middle East.
Yes. Every production run has a distinct batch number associated with its manufacturing date, raw material certificates, and quality control reports. This documentation can be provided to support compliance tracking for large-scale municipal or industrial projects.
We produce standard sheets and rolls in thicknesses from 6mm up to 50mm. Thicker sheets are available by request for specialized acoustic damping or extreme thermal insulation requirements.
In standard indoor HVAC applications with proper installation, our materials have a design service life of 10 to 15 years. For outdoor installations, an appropriate UV-resistant paint, cladding, or protective foil facing is recommended to maintain material integrity over time.
Select from our range of technical insulation materials designed for low-temperature, cryogenic, and high-performance applications.
