Welding temperature of membrane switch

The welding temperature of the membrane switch is -25℃-+90℃. Pcb can withstand low temperature of -50℃, and problems may occur when working downward. High temperature resistance is+140℃, which belongs to high type, because few mechanical equipment can work in this environment. So the welding temperature of the membrane switch is -25℃-+90℃. Membrane switch is an operating system that integrates key function, indicating element and dashboard. It consists of four parts: panel, upper circuit, isolation layer and lower circuit.