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July 1997

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Subject:
Re: Oxide Post Bake
From:
"Thomas E. Waznis" <[log in to unmask]>
Date:
06 Jul 97 21:47:53 -0800
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>     Hello,
>        Does baking inner layers after oxide conversion, (prior to lay up)
>     help in any way? How does it help? How can it hurt? Are some shops
>     doing this?
>     Thank you,
>     Rich


A short bake at low temp. could help. We found water levels of over 1000 ppm
comming off our Oxide line dryer. A 215 F bake for 45 minutes (1"stack)
dropped this to below 300 consistently.
Too much bake will oxidize the copper and lessen adhesion.



Tom Waznis

Hallmark Circuits Inc.

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