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July 2011

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Subject:
From:
Steven Kelly <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steven Kelly <[log in to unmask]>
Date:
Fri, 15 Jul 2011 10:55:58 -0500
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Hi Jeffrey,
Understood - but what is the thickness spec upon receipt - we are seeing +/-.002 variation across a 12 x 18 inch piece. The pieces are right out of the package and are certainly not out of date. Regards Steve

-----Original Message-----
From: Bush, Jeffrey D. (US SSA) [mailto:[log in to unmask]]
Sent: July-15-11 11:47 AM
To: Steven Kelly
Subject: RE: Pre-preg

The thickness will be dependent on what the design is being laminated - planes to planes you yield very close to the pre-preg target - say .003" for a 1080, maybe within 10%,  Features will still embed but the fill will maintain the target well.

Low-Flow is also problematic to make - the gel-time is modified to reduce the flow window rheology which gives up bond strength and degree of cure.  Tg's you will find are reduced - the cosmetic issues are a factor of the poor flow as the glass is not wetting as well as standard material.  Excessive striation would indicate to me a resin that is approaching gel-time out of the box and could be old, curing cycle post treat could be off - and even exposure to UV light.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Kelly
Sent: Friday, July 15, 2011 11:16 AM
To: [log in to unmask]
Subject: [TN] Pre-preg

Hi All,
We are having some issues with lo-flow pre-preg . 1) we are trying to determine from the IPC spec what is the thickness tolerance allowed b) we are seeing a lot of what best can be described as "tiger stripes" throughout the pre-preg. Finally is there an outside lab that can test for resin/glass content that anyone knows.
Regards Steve

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