High-Performance Closed-Cell Elastomeric Thermal Insulation for Crucial HVAC, Industrial, and Cryogenic Piping Systems globally.
Explore our premium grade Class O closed-cell insulation products specialized for complex industrial thermal management.
In modern architectural engineering and high-integrity industrial installations, safety and energy efficiency dictate the layout design. Among various safety specifications, the Class O Fire Rating (typically associated with British Standard BS 476 Parts 6 & 7) represents the pinnacle of fire safety criteria for lining materials. Achieving a Class O rating signifies that the material restricts surface flame spread while minimizing total heat release during combustion, making it crucial for evacuation routes, plenum systems, high-density residential properties, and high-tech manufacturing cleanrooms.
Traditional open-cell insulation systems can harbor microscopic moisture droplets, accelerating thermal degradation and inducing corrosion under insulation (CUI). By contrast, high-grade elastomeric NBR/PVC closed-cell insulation prevents moisture infiltration due to its dense molecular matrix, ensuring long-term thermal performance even in high-humidity climates or cryogenic pipe settings. In this white paper, we examine the mechanical structural integrity, thermodynamic efficiency, and supply logistics that define Class O rubber foam insulation.
| Standard Reference | Classification Parameters | Relevance in Commercial Projects |
|---|---|---|
| BS 476 Part 6 | Fire propagation index (I ≤ 12, i1 ≤ 6) | Limits heat output in flashovers. |
| BS 476 Part 7 | Class 1 surface spread of flame | Restricts flame pathing along materials. |
| ASTM E84 | Flame Spread Index ≤ 25, Smoke Developed ≤ 50 | North American HVAC/Plenum conformance. |
| UL 94 | V-0 rating self-extinguishing index | Verifies safety for close electronic environments. |
The global shift toward net-zero buildings has driven the demand for high-performance insulation. Located in Dacheng, China—the capital of green building materials—Kingflex Insulation Co., Ltd. operates as a leading manufacturing and trading company specializing in advanced thermal solutions.
Under the Jinwei Group, which was founded in 1979 as a pioneer in northern China's insulation industry, Kingflex builds on over 40 years of manufacturing experience. We focus on energy conservation, emission reductions, and structural reliability. Our facility runs five automated, high-precision assembly lines that generate an annual production capacity exceeding 600,000 cubic meters, ensuring consistent supply for large-scale international projects.
The thermal efficiency of our Class O insulation lies in its closed-cell formulation, which forms a dense, non-permeable barrier.
Our NBR/PVC matrix achieves a thermal conductivity ($\lambda$) of ≤ 0.034 W/m·K at 0°C. By capturing dry air within its uniform micro-cells (exceeding 98% closed-cell rate), it limits convective heat transfer and keeps thermal loss to a minimum.
Equipped with a high water vapor diffusion resistance factor ($\mu \ge 10,000$), our insulation acts as a continuous vapor barrier, preventing condensation on chilled water pipes and avoiding thermal loss from water absorption.
Designed with clean-release halogen components, the NBR/PVC formulation self-extinguishes upon fire contact. Under test conditions, it meets BS 476 Class O and UL 94 V-0 requirements, releasing low levels of smoke.
Our dedicated R&D department features eight specialized chemical engineers who continually refine polymer cell structures to improve flexible performance, cold crack resistance, and fire safety ratings.
Each production batch undergoes testing at our on-site facility before dispatch, checking density (40-55 kg/m³), compression resilience (exceeding 80%), and flame propagation indexes.
Kingflex is backed by 230 factory workers, 6 international sales consultants, and a technical team that provides pre-sale consultations, installation guides, and post-sale technical support.
We supply thermal insulation system solutions to engineering and procurement companies in over 66 countries, ensuring projects meet strict engineering standards.
Our quality management systems meet BS 476, CE, REACH, RoHS, UL 94, and ASTM requirements, helping our products comply with local building regulations globally.
Providing solutions for temperature control, energy efficiency, and condensation prevention across various industrial applications.
Our sheets and tubes are used on air ducts and condensate pipelines in commercial facilities, hotels, and hospitals. They prevent exterior condensation, lower duct noise, and improve overall system thermal performance.
Chilled lines, LNG terminals, and liquid nitrogen networks operate under extreme temperatures down to -196°C. Our specialized cryogenic insulation resists thermal contraction cracks, vapor intrusion, and structural degradation.
In power generation and chemical processing, our flexible elastomeric material insulates process pipelines and storage vessels operating up to 105°C, reducing energy consumption and providing corrosion protection.
Kingflex Standard Dimension
Primary Advantages: Uniform cell structure, high water vapor resistance, high compression recovery, and reliable thermal barrier properties.
Kingflex Standard Dimension
Primary Advantages: Even coating from automated spraying, reduced pipe freezing and cracking risks, and simplified slit-and-glue installation.
We work closely with procurement offices to ensure structural parameters match site specifications. Our logistics and customer service teams provide transparent project updates.
Continuous output capability and quality management systems keep our supply lines running smoothly for international markets.
Find answers to common technical, compliance, and ordering questions about our insulation products.
Select from our range of elastomeric tubes, sheets, and high-temp rock wool variants for your next project.
Engineered from synthetic NBR/PVC polymers, our elastomeric insulation sheets and pre-formed tubes are designed for HVAC equipment, refrigeration systems, and chemical process piping.
We supply specialized low-temperature insulation designed to handle thermal stress in liquid gas pipelines and cryogenic systems, preventing cracks and vapor intrusion.
For high-temperature processing and structural fire containment, we manufacture rock wool board and blankets that provide fire protection and acoustic dampening.
Standard and custom-fabricated elastomeric insulation products for industrial installations.
Kingflex
