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May 1998

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Tue, 26 May 1998 09:21:32 EDT
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In a message dated 98-05-25 10:24:31 EDT, you write:

<< 1/ what type of inner layer oxidation is recommended / suitable for
polyimide e.g. black, brown, red, reduced etc. ?
  >>
You  can either get good peel/bond strength, which is traditionally what you
want with polyimide, OR you can get reliable oxide reduction.  The two do not
go hand in hand.  I have seen some fabricators doing it one way, others doing
it the other.

If you put a light red oxide on, you get great bond/peel strength, but to get
a reliable oxide reduction, you have to have a heavy oxide, read BLACK
(>0.5mg/square inch), and you do not get great bond/peel strength at this
oxide weight.  And the reduction process tends to weaken the bond some also.

Can we send you literature on recommended processes for each?
Turns out that there is a patented way to increase the bond strength of an
oxide at any weight, and we own that technology.

Rudy Sedlak
RD Chemical Company
Mountain View CA
fax + 650-962-8004

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