Kingflex
Engineered elastomeric foam pipes and sheet rolls manufactured to international specifications including BS 476, CE, REACH, and UL94.
Modern mechanical systems require visual verification, thermal protection, and fire safety systems designed to scale. Globally, the demand for elastomeric rubber foam insulation has moved beyond traditional black tubing. China Rubber Foam Insulation Tubes with Blue Color represent a massive evolutionary step. Sourced primarily by HVAC planners, industrial designers, and MEP (Mechanical, Electrical, Plumbing) contractors, these blue-colored tubes serve as an immediate physical identifier for chilled water piping, supply lines, and low-temperature fluid conveyance.
In mega-projects across North America, Europe, and the Middle East, the integration of colored insulation eliminates labeling overheads and reduces maintenance errors. By specifying a high-performance NBR/PVC blend with built-in color-coding, engineers ensure both maximum thermal efficiency (with thermal conductivity values $\le 0.034$ W/m·K) and absolute clarity on the industrial floor or commercial ceiling.
The international thermal insulation market is shifting rapidly towards high-density, environmentally stable, and fire-resistant materials. The global elastomeric foam market is projected to grow at a CAGR of 6.2% over the next decade. Key factors driving this trend include:
Kingflex Insulation Co., Ltd. is a professional manufacturing and trading combo for thermal insulation products. Located in Dacheng, China—widely recognized as the capital of green building materials—Kingflex is an energy-saving, environmentally friendly enterprise focused on the research, development, production, and sales of high-performance elastomeric foam systems.
Established by the Jinwei Group, which holds more than 40 years of industrial history since its founding in 1979, Kingflex was the first manufacturer of thermal insulation materials north of the Yangtze River. Today, the enterprise operates with energy saving and consumption reduction as its core concept.
Engineered NBR/PVC closed-cell structures for stable thermal resistance across wide service temperatures.
| Feature / Parameter | Kingflex Standard Sheet Roll Specification | Kingflex Standard Pipe Specification |
|---|---|---|
| Base Polymer | NBR (Nitrile Butadiene Rubber) / PVC Blend | NBR (Nitrile Butadiene Rubber) / PVC Blend |
| Available Thickness | 6mm to 50mm | 9mm to 40mm |
| Inner Diameter (ID) | N/A (Roll format) | 6mm to 114mm |
| Material Density | 40 - 55 kg/m³ | 40 - 55 kg/m³ |
| Service Temp. Range | -40℃ to 105℃ | -40℃ to 105℃ |
| Closed-Cell Rate | > 98% | > 98% |
| Compression Resilience | Over 80% | Over 80% |
| Vapor Permeability Coeff. | $\mu \ge 10,000$ (High resistance) | $\mu \ge 10,000$ (High resistance) |
| Flammability Rating | Class 0 (BS 476 Part 6/7) / UL94 V-0 | Class 0 (BS 476 Part 6/7) / UL94 V-0 |
The core of Kingflex's engineering success lies in the balance of its elastomeric chemistry. Natural and synthetic elastomers like Nitrile Butadiene Rubber (NBR) are copolymerized with Polyvinyl Chloride (PVC) under controlled micro-foaming environments. This reaction creates an extremely fine, closed-cell grid.
Unlike open-cell sponges, where moisture easily compromises the air pockets, our closed-cell matrix locks dry air inside. Air is a poor conductor of heat ($\approx 0.024$ W/m·K at room temperature). Because the cells are tiny and completely sealed off from each other, convection within the foam is prevented, keeping thermal conductivity consistently low over long periods.
Condensation is a major risk in cold-water piping, especially in warm, humid climates. When warm ambient air meets a cold pipe, water vapor condenses, leading to dripping ceilings, mold growth, and corrosion under insulation (CUI).
To prevent this, the material must resist water vapor transmission. Kingflex's NBR/PVC structure features an exceptionally high moisture resistance factor (mu-value $\ge 10,000$). This means the material acts as its own vapor barrier, maintaining its thermal resistance without needing extra protective foils or coatings.
Kingflex's development is rooted in the history of northern China's industrial expansion. The Jinwei Group began manufacturing in 1979, pioneering insulation production north of the Yangtze River. The company has evolved from a local factory into a major global supplier with 5 large automated assembly lines.
This automated system ensures uniform cell size, smooth surface skins, and precise control over wall thickness—critical parameters when supplying tight-tolerance materials for defense, aerospace, chemical processing, and HVAC construction. With an annual output exceeding 600,000 cubic meters, Kingflex maintains reliable lead times for high-volume international sourcing.
How our elastomeric products solve engineering challenges in key industrial sectors.
Used extensively on central air conditioning chilled/hot water pipes, air duct systems, and condensate lines. The blue color signals cold water lines instantly, making inspection and repairs straightforward for maintenance crews.
Designed for liquid nitrogen, chilled carbon dioxide, and LNG transport lines. The flexible, high-density foam resists structural cracking and maintains its shape under extreme temperature fluctuations down to -40℃ (and custom systems for lower ranges).
Used in chemical, petroleum, power, and pharmaceutical plants to insulate steam pipes, process lines, and large storage tanks. These materials prevent thermal energy loss and protect workers from high surface temperatures.
For global projects, compliance with local fire safety and environmental codes is essential. Kingflex products undergo regular, independent laboratory testing to confirm their performance specs:
The insulation industry is continually adapting to new environmental standards. Halogenated flame retardants, long a staple in plastic foam manufacturing, face tighter restrictions due to their environmental persistence. Kingflex's R&D department is focused on three main research areas:
These formulations replace traditional chlorine- and bromine-based fire retardants with inorganic metal hydrates like Alumina Trihydrate (ATH) and Magnesium Hydroxide (MDH). When exposed to heat, these compounds release clean water vapor, cooling the material and diluting combustible gases without releasing acid smoke.
To lower the carbon footprint of NBR/PVC production, we are testing the use of vegetable-oil-derived plasticizers and natural rubber additives to substitute fossil-fuel components while keeping all mechanical and thermal properties intact.
Providing clear traceability and verifying engineering compliance through our regular client support channels.
Answers to common engineering and commercial questions from procurement managers and engineers.
It is primarily used for central HVAC ducts, chilled/hot air conditioning pipes, commercial building thermal insulation, industrial process cold lines, and sound absorption setups.
Yes. Our rubber foam insulation is formulated with flame retardants, meeting major fire safety standards such as BS 476 Class 0, UL94 V-0, and ASTM flammability criteria.
Rubber foam is flexible, has a closed-cell, moisture-proof structure, and is ideal for HVAC and cold-water pipes to prevent condensation. Rock wool is a fibrous material with high-temperature resistance, making it suitable for industrial high-temperature steam lines and structural fire walls.
Yes, we provide full OEM and ODM services. We can customize dimensions, thicknesses (up to 50mm), inner diameters, densities, and colors (such as blue and red for zoning) to match specific project requirements.
Our products have passed CE, BS 476 Part 6 & 7, REACH, RoHS, UL94, and ASTM testing, ensuring compliance with environmental, toxicological, and safety standards globally.
Yes. Each production run has a batch code printed on the packaging or material surface. This allows us to trace raw materials, production line conditions, and QA inspection reports.
We manufacture flexible sheets and rolls in thicknesses ranging from 6mm to 50mm.
When installed correctly in standard indoor or protected outdoor environments (with paint or jacketing), the typical service life ranges from 10 to 15 years, maintaining steady thermal resistance throughout.
Blue insulation is used to easily identify cold water supply and chilled HVAC return lines. This simplifies maintenance, cuts down on piping identification costs, and meets strict industrial color-coding guidelines.
Visual evidence of our manufacturing processes, testing chambers, and finished product inventories.
Explore our full line of elastomeric materials, rock wool, and soundproofing options available directly from our manufacturing facilities.
