Sandwich panels are composite materials commonly used in construction and various industries. They typically consist of two outer layers (skins or facings) and a core material sandwiched between them. The core material provides insulation, rigidity, and strength to the panel. There are several types of sandwich panels, and they can be categorized based on the type of core material and the application. Here are some common types:

1. **Polyurethane (PU) Sandwich Panels:**
– Core Material: Polyurethane foam
– Application: Building construction, cold storage, industrial buildings

2. **Polyisocyanurate (PIR) Sandwich Panels:**
– Core Material: Polyisocyanurate foam
– Application: Roofing, wall cladding, industrial facilities

3. **Expanded Polystyrene (EPS) Sandwich Panels:**
– Core Material: Expanded polystyrene foam
– Application: Residential and commercial construction, cold storage

4. **Mineral Wool Sandwich Panels:**
– Core Material: Mineral wool (rock wool or glass wool)
– Application: Fire-resistant panels for industrial and commercial buildings

5. **Aluminum Honeycomb Sandwich Panels:**
– Core Material: Aluminum honeycomb
– Application: Aerospace, marine, architectural applications

6. **Fiberglass Sandwich Panels:**
– Core Material: Fiberglass
– Application: Transportation (e.g., RVs, boats), building construction

7. **Nomex Honeycomb Sandwich Panels:**
– Core Material: Nomex honeycomb (aramid fiber)
– Application: Aerospace, high-performance applications

8. **Carbon Fiber Sandwich Panels:**
– Core Material: Carbon fiber
– Application: Aerospace, high-performance structures

These are just a few examples, and variations exist based on specific requirements and industry standards. The choice of sandwich panel type depends on factors such as thermal insulation, fire resistance, structural strength, and the intended application.