How many times can we bend the same circuit with out cracking it?
That depends a lot on the on the particular application. Obviously, a thicker circuit is going to be able to tolerate multiple bending operations a lot less than a thinner circuit. So, if you have a single layer circuit, it is a function of the bend radius and how many cycles you are planning on flexing it. Typically with multi layers, the IPC recommends that once you form it, you don’t move it. It should stay in that configuration, and it is a good idea to constrain the circuit after it is formed so any additional handling around the assembly does not exercise that bend at all. For a single or a two layer circuit you can typically move it a little bit with out having a problem unless it is an extremely tight bend radius where you are getting down to a 3:1 or 4:1 bend ratio. Are flex circuits available with Teflon combustion safe materials? You can use Teflon as an insulation material, usually on the outer layers. It can also be used internally as an adhesive. It is not something that
