If the application is flat and 2 dimensional with no requirements for flexing, then use a PCB. If the application requires flexibility, or a 3-dimensional solution, or weight and size are issues, consider using FPC.
Why use a flexible printed circuit?
My design requires touch sensors. Can Sheldahl deliver a solution?
This is an application where FPC really comes into its element. We offer flexible and thin solutions. Moreover, Sheldahl has more material options available than anyone else currently building circuits, and we can specifically tailor the materials and design to give the optimum solution.
We have a long history of building product that ranges from simple PTF membrane switches to transparent, flexible etched ITO for capacitive switches. With multiple options in between depending on the end-user requirements.
I see from the website Sheldahl manufactures flex circuits how about assembly?
Our main focus is on designing and building the optimum solution for the bare FPC. Although SMD on FPC typically uses the same equipment that PCB uses, there are some additional nuances and requirements specific to processing flexible materials. We offer the options of providing the populated final product or offer assistance and
guidance to our customers if they prefer to do the assembly themselves.