Jens-

DSTF is Drum Side Treated Foil, which is also known as Reverse Treated Foil. DSTF is
foil that is treated on the shiny (drum) side, instead of the more typical matte
side. This technology was invented by Polyclad  Laminates, Inc.

The shiny side is then laminated to the core prepreg, leaving the matte side exposed.

DSTF has many advantages:

Non-subtractive pre-cleaning, eliminating the need for microetching, pumice cleaning
or mechanical scrubbing
Improved resist adhesion for higher innerlayer yield
Ultra low profile for cleaner etching and improved board reliability

Erik Bergum, Polyclad, presented a technical paper at Expo '95, which further
explains the advantages of DSTF vs. standard foil.

The technical paper, entitled "Drum Side Treated Foil," is available through the IPC
for $10 for members, and $20 for nonmembers.

Regards-

Chris

Chris Jorgensen
Project Manager
IPC
2215 Sanders Rd.
Northbrook, IL 60062-6135
-p- 847-509-9700 x.328
-f-  847-509-9798
[log in to unmask]
http://www.ipc.org

>>> JB <[log in to unmask]> 05/28/98 08:22PM >>>
At 06:41 28.05.98 -0700, you wrote:
>Hello Techneters
>
>I wonder what are the advantages of DSTF which make this type of
>copper finish gaining so much popularity?

What is DSTF?

Jens

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