There are several types of insulation that can be used in conjunction with aluminum sheets, including: 1. Polyurethane foam, which provides excellent thermal insulation and can be bonded to aluminum sheets. 2. Mineral wool, a fire-resistant material that offers both thermal and acoustic insulation. 3. Polyisocyanurate, known for its high R-value and can be laminated to aluminum for added strength. 4. Extruded polystyrene, which is lightweight and provides good thermal resistance. 5. Fiberglass, a versatile insulation material that can be combined with aluminum for various applications. Each type has its specific properties and applications, making them suitable for different environments and insulation needs.