Rigid-Flex Board (rigid-flex board) is made of a combination of rigid and flexible boards. The rigid PCB part of it can be assembled, and the flexiable PCB part can be bent and connected to reduce the trouble of joints and the volume of the product in dense assembly, while increasing the reliability of the interconnection. It is also called Flex-rigid board.

The application of rigid-flex boards brings multiple benefits, such as saving circuit board space, eliminating the need for connectors and soldering with hot-press tin, and simplifying the product assembly process. Although the price of rigid-flex boards is higher, but they have a wide range of uses. They can be customized according to specific requirements and support high-speed stack up design, making them particularly popular in industrial applications. In addition to military applications, the lightweight of rigid-flex boards are also used widely in aviation and medical equipment.