Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Pre-bake times and temperature for polyimide boards


dan

#31930

Pre-bake times and temperature for polyimide boards | 7 January, 2005

I have a Polyimide board that is showing signs of de-lamination. I was wondering what pre-bake times and temperatures other people would recomend for new boards as well for boards that have been on the shelf for 8 months.

reply »

#31946

Pre-bake times and temperature for polyimide boards | 8 January, 2005

Normally, you should not have to bake boards that are properly packaged and stored. Since you are seeing problems, baking makes sense. Consider 125C for 4 to 6 hours.

Additionally, look here for more, while waiting for others: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=31821

reply »

Dreamsniper

#32008

Pre-bake times and temperature for polyimide boards | 12 January, 2005

we are using polyimide boards 6 inches x 7 inches, 2.5mm thick, 12 to 14 layers, for aerospace industries. I am using a long bake of 12 hours at 70'C prior to manufacturing or exposure to elevated reflow and wave soldering temperature. If schedule is a concern I'm using a 120'C 3.5 hours short time bake and this is as per IPC J-STD-001C's general PWB bake times. We have no problem with this kind of baking process.

hope it helps,

dreamy

reply »

PCB Routers

Metcal soldering rework