Kingflex
Kingflex
Engineered for extreme moisture resistance and thermal stability. Request bulk quotes directly from the factory.
In modern commercial HVAC and building services design, air distribution systems are critical paths for heat gain, thermal loss, and acoustic disturbance. Uninsulated or poorly insulated air vents and plenums act as significant thermal bridges. When warm, humid ambient air comes into contact with the exterior of uninsulated cold air supply ducts, surface temperature drops below the dew point, causing immediate condensation. This "sweating" leads to structural damage, ceiling degradation, and hazardous mold growth (like Aspergillus).
Using elastomeric closed-cell NBR/PVC foam insulation solves this problem at the molecular level. With a closed-cell rate exceeding 98%, the material forms an integrated vapor barrier. Unlike open-cell fibrous products, rubber foam restricts water vapor migration and maintains its thermal conductivity (λ ≤ 0.034 W/m·K at 0°C) throughout its entire 15-year typical operational life.
Every production run of Kingflex rubber foam undergoes strict testing to meet ASTM, BS 476, and European EN standard requirements.
| Property / Parameter | Kingflex Standard Sheet Rolls | Kingflex Pre-formed Insulation Pipes |
|---|---|---|
| Base Material Blend | Acrylonitrile Butadiene Rubber (NBR) & Polyvinyl Chloride (PVC) | Acrylonitrile Butadiene Rubber (NBR) & Polyvinyl Chloride (PVC) |
| Available Thicknesses | 6mm, 9mm, 13mm, 15mm, 19mm, 25mm, 32mm, 40mm, 50mm | 9mm, 13mm, 15mm, 19mm, 25mm, 32mm, 40mm |
| Inner Diameter (ID) Range | N/A (Roll format) | 6mm up to 114mm (Standard plumbing / copper sizes) |
| Density Range | 40 - 55 kg/m³ | 40 - 55 kg/m³ |
| Thermal Conductivity (λ) | ≤ 0.034 W/m·K at 0°C | ≤ 0.034 W/m·K at 0°C |
| Water Vapor Permeability (μ) | ≥ 10,000 (Built-in vapor retarder) | ≥ 10,000 (Built-in vapor retarder) |
| Service Temperature Limit | -40°C to +105°C | -40°C to +105°C |
| Fire Safety Classifications | Class 0 / Class 1 (BS 476), V-0 Self-extinguishing (UL94) | Class 0 / Class 1 (BS 476), V-0 Self-extinguishing (UL94) |
Open-cell fibers like fiberglass or rock wool act like sponges if moisture breaches their outer foil jacket. When moisture enters, their air spaces fill with water, increasing thermal conductivity by up to 200%. Our NBR/PVC closed-cell structure keeps its physical state constant, ensuring that the air ducts inside stay dry and mold-free.
With a compression resilience of over 80%, Kingflex rubber foam easily absorbs structure-borne vibrations from inline fan coils, duct mixers, and dampers. It dampens noise transmission across structural walls and prevents acoustic issues in modern open-ceiling architectural designs.
We manufacture HVAC insulation materials that meet strict global fire codes and green building standards.
For large mechanical contractors and commercial developers, choosing certified insulation is key to passing safety inspections. Kingflex products carry certifications from third-party laboratories to meet these compliance demands:
Located in Dacheng, China—the industrial capital for green building insulation materials—we combine cost efficiency with advanced manufacturing.
Being located in Dacheng gives us direct access to raw materials and specialized chemical suppliers, reducing internal transit times and keeping prices stable for wholesale buyers.
Our factory operates five fully automated, high-speed continuous foaming extrusion lines. This setup delivers reliable sheet and pipe dimensions and supports an annual capacity of 600,000 cubic meters.
With 16 years of experience shipping to over 66 countries, our logistics team handles custom clearance, specialized vacuum packaging to save container space, and complete shipping documentation.
Detailed physical characteristics, sizing options, and practical field applications for air vents, pipelines, and equipment systems.
Our NBR/PVC sheets are designed for large rectangular ducts, air handling unit (AHU) casings, large-diameter valves, and industrial air plenum chambers.
| Material Blend | Premium closed-cell NBR/PVC |
| Thickness Range | 6mm to 50mm |
| Density Range | 40 - 55 kg/m³ |
| Temperature Range | -40℃ to 105℃ |
Designed specifically for cylindrical HVAC vents, refrigerant piping systems, water delivery channels, and complex process pipelines.
| Material Blend | Premium closed-cell NBR/PVC |
| Thickness Range | 9mm to 40mm |
| Inner Diameter (ID) | 6mm to 114mm |
| Temperature Range | -40℃ to 105℃ |
Our NBR/PVC elastomeric rubber foam sheets and pipes are used across a wide range of building and industrial sectors.
Thermal insulation for both rectangular and round supply air vents and return air plenum ducts. It prevents condensation, reduces energy losses, and dampens dynamic air turbulence.
Applied to walls, roofs, and basements for combined thermal insulation and sound damping. It helps buildings meet energy-efficiency targets like LEED or regional code requirements.
Insulation for process pipelines, boilers, and chemical tanks. It minimizes ambient heat interference in petrochemical processing and high-temperature manufacturing.
A reliable choice for indoor environments requiring clean air. Because the material is dust-free and does not shed fibers, it keeps ventilation air clean and protects sensitive equipment.
Our in-house R&D lab and quality control systems support our export operations and project work worldwide.
Our NBR/PVC elastomeric rubber foam insulation is used in projects worldwide, from commercial centers to cryogenic systems.
Kingflex Insulation Co., Ltd. combines manufacturing and trading to supply thermal insulation products. Our research, development, and production facility is located in Dacheng, China—a hub for green building materials. As an energy-saving enterprise, we focus on research, development, production, and sales.
We focus on reducing energy consumption and help guide clients through consulting, R&D, production, installation support, and post-sale service. Established by the Jinwei Group (founded in 1979 as the first thermal insulation manufacturer north of the Yangtze River), Kingflex brings over 40 years of group heritage to the industry.
Our team consists of 8 professional engineers in our R&D Department, 6 international sales specialists, and 230 workers in our production department, all focused on delivering reliable materials and service.
We maintain transparent relationships with our partners worldwide, coordinating closely with project managers and procurement offices. Here are direct screenshots of customer feedback regarding our shipments, custom dimensions, and product quality:
Clear answers to common questions about thermal efficiency, fire safety, and custom manufacturing.
Select from our product catalog to request wholesale quotes and shipping details.
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