Product Structure and Core Performance
1.1 Material Composition
Surface Layers: High-quality color-coated steel sheets (galvanized, galvalume, or fluorocarbon-coated), typically 0.4-1.0mm thick
Core Material: Rock wool, density ≥120kg/m³, thermal conductivity ≤0.043W/(m·K)
Edge Sealing Material: Polyurethane rigid foam, density 25-45kg/m³
1.2 Core Performance Advantages
Excellent Fire Resistance: Class A non-combustible material, fire resistance rating up to REI 30-120 minutes (50mm thick: REI 30; 80mm thick: REI 60; 100mm thick: REI 120), capable of withstanding temperatures over 1000°C
Superior Thermal Insulation: Thermal conductivity as low as 0.043W/m²K, effectively preventing thermal bridging
Significant Sound Insulation and Absorption: Sound insulation effect up to RW=29-30dB, sound absorption performance reaching ΔLA=15.7dB(A)
Water and Moisture Resistance: Polyurethane edge sealing effectively prevents rock wool from absorbing moisture, hydrophobic rate ≥98%
High Structural Strength: Bonding strength ≥0.10MPa (new standard requirement), bending capacity meets roof load requirements
2. Production Process and Technical Standards
2.1 Production Process
Polyurethane Foaming Composite Process: Uses polyurethane foaming agents evenly sprayed on color-coated steel sheets, foaming and forming between the sheets
Bonding Composite Process: Rock wool strips are rotated 90 degrees and strongly bonded to metal panels using high-strength adhesives
2.2 Technical Standards
The latest national standard GB/T 23932-2025 "Metal-faced Insulated Sandwich Panels for Building" sets higher requirements:
Raw Material Requirements: Rock wool must comply with GB/T 19686; glass wool must comply with GB/T 17795
Performance Indicators: Bonding strength of rock wool sandwich panels increased from 0.06MPa to 0.10MPa; hydrophobic rate ≥98%; acidity coefficient ≥1.6
Specifications and Dimensions: Thickness adjusted to 75mm, 125mm replacing original 80mm, 120mm; rigid polyurethane/PIR sandwich panels added 150mm, 200mm thickness options
Combustion Performance: Rock wool and glass wool sandwich panels must be Class A non-combustible; organic core materials not lower than Class B2
3. Application Areas and Market Status
3.1 Main Application Scenarios
Industrial Buildings: Wall and roof systems for factories and warehouses
Commercial Buildings: Exterior walls and internal partitions for shopping malls and hotels
Public Buildings: Hospitals, schools, stadiums, transportation hubs
Cold Chain Logistics: Cold storage facilities, refrigerated vehicles
Cleanroom Engineering: Electronic workshops, laboratories, pharmaceutical cleanrooms
Transportation: High-speed rail compartment partitions, ship bulkheads, subway platform ceilings
3.2 Market Status and Development Trends
Market Size: China's industrial building insulation materials market exceeded 87 billion yuan in 2026, with polyurethane-edged rock wool composite panels growing at 18.7%
Market Share: Polyurethane-edged rock wool sandwich panels account for over 35% of the high-end sandwich panel market
Growth Drivers: National "dual-carbon" strategy advancement, upgraded building safety standards, increased demand for green buildings
Price Range: Conventional specifications approximately 80-150 yuan/square meter, depending on project requirements and purchase volume
4. Selection and Installation Considerations
4.1 Selection Points
Certifications: Choose manufacturers with ISO9001, ISO14001, and National Fire Protection Building Materials Quality Supervision and Inspection Center certifications
Technical Parameters: Ensure key indicators like bonding strength, combustion performance, and thermal conductivity comply with GB/T 23932-2025
Production Process: Prefer manufacturers with automated production lines and comprehensive quality control systems
Project References: Evaluate manufacturer experience and market reputation in similar projects
4.2 Installation Requirements
Usage Differentiation: Strictly distinguish between wall panels and roof panels
Edge Sealing: Ensure proper sealing between edge panels and main panels to prevent leaks
Connection Methods: Roof panels use self-tapping screws on purlins; wall panels can use hidden or exposed fastener installation
Construction Efficiency: Daily installation area can reach 600-800m², suitable for efficient construction of large industrial plants
5. Industry Development Trends
Technological Upgrades: Development toward higher fire ratings, better airtightness, stronger structural strength, and lower thermal conductivity
Standard Improvements: New national standards raise requirements for key indicators like bonding strength and hydrophobic rate, driving industry upgrades
Application Expansion: From traditional industrial buildings to public facilities, transportation infrastructure, aerospace, and other high-end fields
Environmental Sustainability: Compliance with green building standards supports national "dual-carbon" goals through building energy efficiency
As a preferred material for modern building envelope systems, polyurethane-edged rock wool sandwich panels play an increasingly important role in building energy efficiency and safety due to their excellent fire resistance, thermal insulation, soundproofing, and construction convenience. With technological advancements and growing market demand, this product will continue to evolve toward higher performance, multifunctionality, and environmental sustainability.
