Sandwhich panels are high-performance building components widely used in steel structure projects, featuring the advantages of light weight, high strength, excellent thermal insulation, and quick installation. They are an ideal choice for industrial workshops, warehouses, logistics centers, prefabricated buildings, and other steel structure applications.

Core Structure of Composite Panels

1. Face Sheets
   
   
   The top and bottom surface layers are usually made of color-coated steel plates, aluminum-magnesium-manganese alloy plates, or stainless steel plates. These materials offer good corrosion resistance, weather resistance, and aesthetic appearance, and can be customized into various colors and textures to meet different architectural design requirements.
2. Core Material
   
   
   The middle core layer is the core part that determines the thermal insulation, fire resistance, and mechanical properties of the panel. Common core materials include:
   • Polyurethane (PU): Excellent thermal insulation performance, low thermal conductivity, and good structural bonding strength; it has a certain flame-retardant effect when processed with flame-retardant additives.
   • Polystyrene (EPS/XPS): EPS has a low cost and moderate thermal insulation effect, suitable for general thermal insulation scenarios; XPS has higher density, better compressive strength and moisture resistance, and is applicable to projects with higher requirements.
   • Rock Wool/Mineral Wool: Outstanding fire resistance, non-combustible, and good sound insulation performance, suitable for high-fire-risk places such as industrial workshops and high-rise steel structures.
3. Bonding Layer
   
   
   High-strength adhesive is used to firmly bond the face sheets and the core material into an integrated structure, ensuring the overall rigidity and load-bearing capacity of the panel.

Key Advantages for Steel Structure Applications

1. Lightweight and High Strength
   
   
   The density of composite panels is much lower than that of traditional brick-concrete walls, which can significantly reduce the dead load of steel structures, save the consumption of steel beams and columns, and lower the overall project cost. Meanwhile, the sandwich structure endows the panels with good bending resistance and compressive strength, which can bear certain wind and snow loads.
2. Energy Saving and Thermal Insulation
   
   
   The closed-cell structure of the core material effectively blocks heat transfer, reducing the energy consumption of heating and cooling in buildings. It helps steel structure buildings meet green building energy-saving standards and reduce long-term operation costs.
3. Fast Construction and Installation
   
   
   Composite panels can be prefabricated in factories according to design dimensions, and directly assembled on-site with steel structure frames using fasteners such as self-tapping screws. This greatly shortens the construction period, especially suitable for fast-built projects such as prefabricated steel structure buildings.
4. Multifunctional Integration
   
   
   One panel integrates multiple functions such as load-bearing, thermal insulation, fire prevention, waterproofing, and decoration, eliminating the need for multiple construction procedures like external wall insulation and decoration, simplifying the construction process.
5. Good Durability
   
   
   The surface of color-coated steel plates is treated with anti-corrosion and anti-aging coatings, which can resist acid rain, ultraviolet radiation, and other harsh environments. The service life can reach more than 20 years under normal maintenance.

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