Q: We are looking for screws to hold down electronic circuit boards. Unfortunately the mounting provisions need to be electrically isolated from the mounts. In addition, we need strength, non-conductivity, and impact resistance, even at cold temperatures (-40C).
A: A great material to consider would be PEEK screws or PEEK with Glass Fiber reinforcement. These PEEK fasteners are very strong and tough polymers that will be non-conductive. You could learn more information about these fasteners at the following link.