Explore our advanced range of rubber-plastic foam and multi-layer elastomeric insulation sheets, custom-formulated for critical fire-safety, low-toxicity, and extreme-temperature applications.
In modern industrial engineering and architectural design, the specify-and-buy equation has fundamentally shifted. Traditional halogenated flame-retardant elastomeric insulation materials (which rely heavily on chlorinated or brominated agents) are facing strict regulatory hurdles. Global procurement departments across the Americas, European Union, and Asia-Pacific regions are prioritizing environmental compliance and safety thresholds.
Under international building codes and toxic chemical control policies, materials utilized in critical public enclosures must satisfy zero-halogen parameters. When standard NBR/PVC elastomer burns, it releases hydrogen chloride (HCl) or hydrogen bromide (HBr) gases. These gases, when combined with water vapor, transform into highly corrosive acids that destroy sensitive electronics, compromise server racks in data centers, and damage pulmonary systems in evacuating personnel.
As a leading China Halogen-Free Insulation Sheet Roll Manufacturer, Kingflex fulfills this demand by deploying next-generation non-halogenated polymers that rely on metal hydroxides (such as Aluminum Trihydroxide - ATH and Magnesium Hydroxide - MDH) coupled with phosphorus-nitrogen flame retardants. Our products provide low thermal conductivity, high moisture barrier capabilities, and eco-friendly operations.
Halogen-free closed-cell insulation sheet rolls are critical to operations across several commercial and heavy industrial fields:
Applied to large air ducts and chilled water supply lines in airports, hospitals, shopping malls, and green office spaces. The closed-cell structure prevents condensation, while the halogen-free composition meets strict smoke and toxicity requirements.
Designed to comply with fire testing standards like EN 45545-2 (rail vehicles) and the IMO FTP Code (marine vessels). Under fire, it minimizes smoke density and toxicity, protecting passengers in confined compartments.
Specifically used in semiconductor, pharmaceutical, and electronic component manufacturing plants where volatile organic compounds (VOCs) and halogen contamination can damage sensitive silicon wafer processes.
| Insulation Parameter | Standard NBR/PVC Sheet | Halogen-Free Elastomeric Sheet | Testing Standard Reference |
|---|---|---|---|
| Thermal Conductivity (λ at 0°C) | ≤ 0.034 W/(m·K) | ≤ 0.035 W/(m·K) | ASTM C518 / EN 12667 |
| Water Vapor Permeability (μ) | ≥ 10,000 | ≥ 7,000 | ASTM E96 / EN 12086 |
| Acid Gas Emission (HCl & HBr) | High risk (> 50 mg/g) | Zero (Non-detectable) | IEC 60754-1 / EN 50267 |
| Operating Limits | -40°C to +105°C | -50°C to +105°C | ASTM C534 |
| Smoke Toxicity Index | Classified as hazardous | Satisfies FED < 0.1 | EN 45545-2 / NES 713 |
The manufacturing process of halogen-free elastomeric foams requires precise control over polymer chemistry and thermal expansion. Our technical roadmap focuses on three main developments:
Typical metal hydroxide flame retardants (ATH/MDH) require high loading levels to be effective, which can impact the flexibility and structural integrity of the rubber foam. Our engineering team utilizes a synergistic combination of organic phosphorus, nitrogen-based flame retardants, and modified silicate nanoparticles.
This approach establishes a protective, heat-resistant carbonized char layer on the material's surface when exposed to flames, stopping oxygen ingress and flame propagation without affecting the foam's flexibility or installation properties.
By refining the chemical blowing agents and scheduling specific vulcanization temperatures, we have reduced the average cell diameter of the foam to under 120 micrometers while maintaining a closed-cell ratio above 98%.
This closed-cell structure keeps thermal conductivity low, even under high ambient humidity, by trapping dry gas pockets inside the elastomer matrix and blocking water vapor passage.
Kingflex Insulation Co., Ltd., a subsidiary of the Jinwei Group, brings over 40 years of industry experience, dating back to our group's founding in 1979. We were a pioneer in thermal insulation manufacturing north of the Yangtze River. Today, Kingflex is a key environmental science enterprise integrating R&D, manufacturing, distribution, and system design support.
Equipped with 5 automated continuous extrusion and vulcanization assembly lines, our annual manufacturing capacity exceeds 600,000 cubic meters. We serve as a designated technical materials manufacturer for the Ministry of Energy, the Ministry of Electric Power, and the Ministry of Chemical Industry.
Our manufacturing and quality assurance operations align with global testing standards. Kingflex products carry certificates for performance, safety, and traceability.
BS 476 Standards Certificate
UL94 Fire Performance Safety
ASTM Material Quality Verification
ISO Management Certification
Our Quality Management System provides full tracking from raw chemical delivery to final curing. Batch stamps on the back of each halogen-free rubber foam roll note the raw material batch, production line number, operator ID, and vulcanization date, giving commercial buyers clear and trackable product data.
Our sales and customer service teams support overseas project orders. The following document screenshots show our transaction processing, quality confirmation, and delivery tracking protocols with international clients.
Kingflex halogen-free materials are available in two forms: flat rolls (sheets) for wide-surface application on air ducts and tanks, and pre-slit tubes (pipes) for pipelines.
Material Structure: Non-halogenated polymer base combined with active nitrogen-phosphorus flame retardancy agents.
Material Structure: High-density elastomeric blend designed for pipe insulation, preventing freezing, pipe sweat, and heat transfer.
Our factory utilizes multi-stage automated mixers, cold feed rubber extruders, and computerized temperature-gradient vulcanization tunnels to manage foam expansion and mechanical properties.
Review technical answers regarding the properties, chemistry, and installation of Kingflex halogen-free elastomeric foam sheet rolls.
Select from our complete range of flexible NBR/PVC elastomeric rubber foams, cryogenic protection jackets, and acoustic barrier boards to suit your project specifications.
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