What are Sandwich Panels?
Sandwich panels are a modern building material consisting of three layers: two thin, stiff outer sheets (known as "skins" or "facings") bonded to a lightweight core material. This structure creates a high-strength, load-bearing element that is significantly lighter than traditional building materials like concrete or steel.
2. Key Benefits
Excellent Thermal Insulation: The core material acts as a barrier against heat transfer, reducing energy consumption for heating and cooling.
High Structural Strength: The combination of materials provides high bending strength and rigidity, making them ideal for roofs and walls.
Lightweight: Reduces the load on the building's foundation and structural frame.
Quick Installation: Prefabricated panels allow for rapid assembly, significantly shortening construction schedules.
Fire Resistance: Many core materials are available in fire-retardant grades (e.g., A-grade rock wool).
3. Common Types by Core Material
A. EPS Sandwich Panels (Expanded Polystyrene)
Description: Uses expanded polystyrene foam as the core. It is the most economical option.
Features: Good thermal insulation, lightweight, and easy to process.
Applications: Economical warehouses, cold storage rooms, clean rooms, and partition walls where high fire ratings are not the primary concern.
B. Rock Wool Sandwich Panels (Mineral Wool)
Description: Uses high-density rock wool (stone wool) as the core.
Features: Class A Fire Rating (non-combustible), excellent sound absorption, and good thermal stability.
Applications: High-rise buildings, power plants, steel structures, and areas with strict fire safety regulations.
C. PU/PIR Sandwich Panels (Polyurethane / Polyisocyanurate)
Description: Uses rigid polyurethane or PIR foam.
Features: The best thermal insulation performance (lowest thermal conductivity), high strength, and water resistance.
Applications: High-end cold storage (freezers), clean rooms, food processing plants, and pharmaceutical factories.
D. XPS Sandwich Panels (Extruded Polystyrene)
Description: Uses extruded polystyrene foam.
Features: Higher density and compressive strength than EPS, with low water absorption.
Applications: Flooring, load-bearing walls, and damp environments.
4. Common Types by Surface Material
Color Steel (PPGI/PPGL): Prepainted galvanized or galvalume steel. The most common choice for industrial buildings due to its durability and corrosion resistance.
Aluminum: Used for specific applications requiring higher corrosion resistance or a different aesthetic.
Stainless Steel: Used in food processing plants, breweries, and pharmaceutical clean rooms for hygiene and corrosion resistance.
5. Applications
Industrial Buildings: Factory workshops, warehouses, logistics centers.
Cold Chain: Cold storage warehouses, refrigerated trucks, freezer rooms.
Clean Rooms: Electronics factories, hospitals, pharmaceutical labs.
Commercial Buildings: Office partitions, shopping malls, exhibition centers.
Prefabricated Houses: Site offices, worker dormitories, container houses.
