"Hollow board is a series of multi-wall polycarbonate sheet products, which is characterized by a honeycomb structure with at least two walls and connecting ribs. This double-wall or multi-layer structure can form an insulated air space (cell), This helps to reduce the penetration of heat (thermal) energy, which leads to cooler summer areas and cooler months to warmer areas. In short, the structure of the hollow panel can produce an energy-saving, rigid, and impact-resistant sheet with its weight Much lighter than solid polycarbonate, acrylic or glass panels. Hollow panels provide much better energy efficiency than any single-layer thin panels. Our hollow polycarbonate panels have a variety of options. Double-layer hollow panels, three-layer hollow panels , Four-layer hollow board, rice -shaped hollow board, honeycomb hollow board. Popular applications of double-layer polycarbonate panels and multilayer polycarbonate panels are exterior roofs, glass, walls or building exteriors, interior partitions, displays, etc."