Probably not. If your customer wanted them to be able to withstand any
damage beyond the rated Tg of the material, they should not expect to
see perfect product when finished cycling them past that point. I don't
see how filling the vias is going to help bond the flex layers together.

If I wanted to test asphalt, I wouldn't use a jackhammer.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Kelly
Sent: Tuesday, December 22, 2009 10:26 AM
To: [log in to unmask]
Subject: [TN] Via fill on flex

Hi All,

We have a 6 layer flex that my customer has to thermal cycle at
temperatures beyond the rated Tg's of the material- the end use
environment is about as bad as it gets. After repeated thermal cycles we
start to see cracks develop in the glue layer used to bond the
adhesiveless layers together. Will some kind of via fill help this
issue?

Thanks in advance.

Regards Steve Kelly





Steve Kelly (PLEASE NOTE NEW E-MAIL ADDRESS)

(416) 750-8433 (work)

(416) 750-0016 (fax)

(416) 577-8433 (cell)




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