Sandwich panels (also refers to as composite panels or structural insulating panels (SIP)), it consists of two layers sheet,  material in PPGI/PPGL/aluminum/Al-Mg-Mn alloy metal sheets, and bonded to either side of a lightweight core. The three components act together as a composite, that result in the characteristics of the sandwich panel is better performance than single layer panel.

For the two outward-surface layers are applied to increase the overall durability of the sandwich panel, weather impact resistance, and resist in-plane forces of tension and compression, what is more, there provide available in a wide varity of colors so that suit for different architectural styles, the modern style, traditional building design.

The sandwich panel core keeps the two faces in the correct position, resists shear forces, and provides insulation, and various core thickness can be chosen according the requirements of weather, environment, etc..  Also, there have different core types can be chosen。

1) steel color for choosing ,some as the below:

2) Interlayer material optional

（rock wool, glass wool ,PU , foam, Propor...)