Here's the link I believe you are referring to:

http://www.datacircuits.com/docs/Full%20Material%20Sheet.pdf


I noticed when I looked at my Rogers book that 4003C is not UL 94V-0, while
4350B is. So it is the 4003C that is working for you, right?
I also notice that 4003C has a little bit lower Dk and a lower tan delta
than the 4350B. Perhaps it's the tan delta that's key and a PTFE-based
material like Taconic RF-35 (which does have UL 94V-0 rating) will work for
you. (It's not on the list at the URL above)
Also, the Arlon 25N that Jeffrey suggested is not 94V-0 rated, but 25FR is.
Unfortunately, the tan delta of the 25FR is higher (like that of 4350B).


Tim Reeves
Materials/Lamination Engineer
Tyco Printed Circuit Group - Dallas Division
(800) 783-9223   ext. 1120


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Colin Weber
Sent: Sunday, August 22, 2004 3:53 PM
Subject: Re: Search for HF Laminate Material


Hi Phil,

I tried that link at the time and it didn't work so I trashed it. Maybe
there was
a problem with our Intranet at the time. Do you still have that link?

Tim and Ingemar,

We are not using embedded/buried capacitors. The capacitance we wish to
achieve is
on external layers using copper pads. We succeed with the rogers non-UL
material.
Now we need to replicate the results with a UL material. We are looking to
create
a capacitance of 0.25pF and these are used in sampling 3.5kV of RF. We do
not
know precisely what didn't work with the UL Rogers material and why the
non-UL
did work. At this stage we are just trying different materials and looking
at end results for our application, of which I am unable to describe in
detail.


Colin


At 01:44 AM 8/21/2004, you wrote:
>hi,
>
>a couple days ago a url was provided that presented a very extensive table
of
>properties for several vendors laminate products.  did  you check there?
>
>phil

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