Product Overview
Fire-Resistant Rock Wool Sandwich Panel is a high-performance building envelope system designed for steel structure industrial and commercial buildings requiring fire safety compliance, thermal insulation efficiency, and long-term durability.
It is composed of:
- Two outer layers of pre-painted galvanized steel / Al-Zn steel sheets
- A high-density rock wool insulation core
- Industrial-grade continuous bonding system
It is widely used in EPC industrial projects where building safety certification and lifecycle cost control are critical requirements.
Technical Specifications
|
Item |
Specification |
|
Core Material |
Rock Wool (Mineral Wool) |
|
Steel Facing |
Galvanized / Al-Zn / Color Coated Steel |
|
Steel Thickness |
0.3 – 0.8 mm |
|
Panel Thickness |
50 / 75 / 100 / 120 / 150 / 200 mm |
|
Effective Width |
950 mm / 1150 mm |
|
Density |
80 – 150 kg/m³ (customizable) |
|
Thermal Conductivity |
0.035 – 0.043 W/m·K |
|
Fire Rating |
A1 Non-combustible |
|
Surface Coating |
PE / PVDF / SMP |
|
Color System |
RAL standard colors |
|
Joint Type |
Tongue & groove / concealed fastener |
Core Performance Advantages
Fire Safety and Compliance
Classified as Class A1 non-combustible material according to EN 13501-1 equivalents.
Withstands temperatures exceeding 1000 degrees Celsius without structural failure.
Engineered to meet EI 60 / EI 90 / EI 120 fire-resistance ratings .
Effectively blocks flame spread across complex building compartments, mitigating insurance risks.
Thermal Insulation and Climate Adaptation
Low Thermal Conductivity: Thermal conductivity ranges from 0.035 to 0.043 W/(m*K).
Substantially reduces HVAC energy consumption for both extreme cold and tropical environments.
Minimizes thermal bridging when installed with advanced structural joint configurations.
Acoustic Performance and Noise Control
The high-density open-pore fiber structure effectively absorbs airborne sound waves.
Excellent sound transmission loss (Rw >= 30-35 dB depending on thickness), making it ideal for high-noise industrial facilities, workshops, and heavy machinery zones.
Mechanical Strength and Wind-Load Resistance
Composite action between the steel facings and high-density core creates high flexural rigidity.
Resistant to extreme wind loads, positive/negative pressures, and structural deflections in large-span designs.
Moisture Management and Durability
Engineered with highly hydrophobic (water-repellent) rock wool core additives.
Vapor-permeable structure allows the building envelope to breathe, preventing interstitial condensation, mold growth, and bacterial colonization.
Fast-Track Installation Efficiency
Prefabricated modular system designed for rapid assembly.
Precision-machined joints reduce manual alignment work, minimizing on-site labor overhead and speeding up project delivery for EPC contractors.
Global Application Scenarios
Our structural envelope panels are widely integrated into global supply chains for:
Heavy Industrial & Manufacturing
Steel structure smelters, chemical storage units, automotive assembly plants, and manufacturing facilities.
Logistics & High-Value Warehousing
E-commerce fulfillment hubs, airport air-cargo terminals, distribution centers, and non-cold chain agricultural storage.
Energy & Tech Infrastructure
Data centers (hyperscale server halls), power distribution plants, biomass hubs, and transport infrastructure.
Public & Commercial Complexes
Exhibition halls, mega-malls, airport terminals, and sports stadiums.
Advanced Panel Structure & Premium Materials
Steel Facings
Substrate Options: High-tensile Galvanized Steel / Galvalume Steel (Z120-Z275 / AZ100-AZ150).
Thickness Range: 0.3 mm – 0.8 mm.
Premium Protective Coatings: PE, SMP, HDP, or PVDF for maximum UV resistance and chemical/anti-corrosion protection.
Surface Aesthetics: Smooth, Micro-ribbed, Deep-ribbed, Embossed, or standard flat with temporary protective film.
High-Density Rock Wool Core
Raw Material: 100% natural basalt mineral fibers, sustainably sourced and melted at high temperatures.
Optimized Fiber Orientation: Vertically aligned fibers perpendicular to the steel skins for maximum load-bearing capacity.
High Density: Available in 80 kg/m³ to 150 kg/m³ to meet strict structural and acoustic structural specs.
Thermal Performance: Thermal conductivity as low as 0.040 W/m·K or less.
Advanced Bonding System
Continuous Automated Production: Precision-controlled continuous lamination eliminates manual bonding errors.
High-Strength Adhesive: Specially formulated, fire-retardant polyurethane/epoxy adhesive guarantees complete anti-delamination structural integrity.
Rock Wool vs PU vs EPS
|
Performance |
Rock Wool |
PU Panel |
EPS Panel |
|
Fire Safety |
⭐ A1 Non-combustible |
Combustible |
Highly combustible |
|
Industrial Use |
✔ Recommended |
Limited |
Not suitable |
|
Acoustic Performance |
Excellent |
Medium |
Poor |
|
Environmental Safety |
High |
Medium |
Low |
|
Fire Risk Level |
Very Low |
High |
Very High |
Fire Performance
50 mm Thickness -> EI30 (30 Minutes Fire Integrity & Insulation)
75 mm Thickness -> EI60 (60 Minutes Fire Integrity & Insulation)
100 mm Thickness -> EI90 (90 Minutes Fire Integrity & Insulation)
150 mm+ Thickness -> EI120 to EI180 (Up to 3 Hours Maximum Protection)
Rigorous Quality Control Process
Every batch produced leaves our factory with complete traceable testing data:
Raw Material Inspection
Steel tensile strength, zinc-coating thickness, and rock wool density verification.
Adhesion Tensile Strength Testing
Ensuring the mechanical bond exceeds international standard limits.
Dimensional Tolerance Checks
Strict lasers ensuring precise joint interlocking.
Fire Testing Simulations
Verifying non-combustibility and structural integrity.
Customization Options
RAL Colors
Complete color matching via the international RAL system.
Joint Connection Profile
Hidden-fastener joints (for elegant architectural facades) or exposed-fastener joint profiles.
Acoustic Upgrades
Perforated inner steel facings available for high-noise machinery rooms.
Heavy-Duty Seaworthy Logistics Packaging
Surface Protection: Strict plastic protective film shielding steel faces against scratches.
Moisture Barriers: Wrapped bundle protection preventing ocean humidity penetration.
Safe Handling Kits: Integrated heavy-duty bottom foam blocks and steel straps optimized for forklift/crane unloading at job sites.
Container Optimization: Expertly stacked configurations maximizing ocean container volume (20FT / 40HQ / Breakbulk) to reduce ocean freight costs.
Lead Time: 15-30 Days (Flexible scheduling mapped out to match your project milestones).
Why Partner with Wanxiang?
System Provider, Not Just Vendor: We deliver complete envelope solutions, including matching flashing systems, custom fasteners, and accessories.
Proven Track Record: Over 500,000+ square meters of industrial insulated metal panels successfully shipped to EPC projects across the Middle East, Southeast Asia, Europe, and Africa.
Advanced Longevity: Specialized anti-corrosion coating selections ensuring an extended asset lifecycle with low maintenance overhead.
Certificates
Frequently Asked Questions
Q: What fire resistance level can rock wool sandwich panels achieve?
A: Rock wool sandwich panels are classified as A1 non-combustible material and can be engineered into EI 60, EI 90, or EI 120 fire-rated systems depending on project requirements and system design.
Q: Can rock wool sandwich panels be used for external wall systems?
A: Yes. They are widely used for external wall cladding systems in steel structure buildings, especially in projects requiring fire safety compliance and thermal insulation performance.
Q: What is the difference between rock wool, PU, and EPS panels?
A: Rock wool is non-combustible and fire-safe, while PU and EPS are organic insulation materials that are combustible and may produce toxic smoke during fire exposure. Rock wool is preferred for high fire-risk industrial buildings.
Q: Are rock wool sandwich panels suitable for cold storage or refrigerated buildings?
A: Yes. Rock wool panels provide stable thermal insulation and are commonly used in cold storage facilities, food processing plants, and temperature-controlled warehouses.
Q: Can panel thickness and density be customized?
A: Yes. We can customize:
Panel thickness (50–200 mm)
Rock wool density (80–150 kg/m³)
Steel sheet thickness
Color coating system
based on project design requirements.
Q: Do rock wool sandwich panels meet international building standards?
A: Yes. Production can comply with EN, ASTM, and ISO standards depending on project requirements and destination country regulations.
Q: What is the expected service life of rock wool sandwich panels?
A: Under proper installation and normal environmental conditions, the service life is typically 25–30 years or longer, depending on project usage and maintenance.
Q: Can Wanxiang provide technical support for large engineering projects?
A: Yes. We provide engineering-level support, including:
Project drawing review
System design suggestions
Material specification optimization
EPC contractor cooperation support
Inquiry & Technical Cooperation
We support global B2B engineering buyers with:
Fast quotation within 24 hours
Project drawing review support
Sample evaluation support
EPC project technical cooperation
Project-based pricing solutions
Send us your project drawings or requirements to receive a professional quotation.
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