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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 15 Sep 1998 14:31:28 -0500 |
Content-Type: | text/plain |
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Hi All - re: the ongoing discussion on repair of polyimide based flex and
acrylic adhesives - THERE'S A BETTER WAY
Several years ago DuPont and other flex manufacturers introduced bondable
polyimides which use "adhesiveless" materials and allow a person to largely
get away from the frailties of the acrylics. In the case of DuPont, the
material is called Pyralux AP and a good point of contact is Mike Crutchfield
at 919.248.5341 (NC).
We have changed over most of our existing product, which ranges from single
layer flex to 16 layer rigid-flex. Several of our suppliers indicate their
improved yields offset the added cost of the AP materials. In our assembly
shops, we encounter fewer measling incidents and I have heard of no
delaminations. We have also been able to eliminate intermediate presolder
bake cycles of the boards, which obviously doesn't hurt solderability.
Regards - Kelly
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