Kathy,
According to theory, tetra-function get more dimension stable than
di-function. In generally, tetra function has higher Tg. But I found
Nanya tetra-function has just a little higher Tg than di-function. I
don't get any result indicated more stabe dimension. Taiyo PSR4000 is
one of very good solder mask from our experience. I never use Tamura
DSR2200, so there is no comment on this issue.

Howard Lin
Maxedge RD Center

> -----Original Message-----
> From: Kathy Palumbo [SMTP:[log in to unmask]]
> Sent: Thursday, September 03, 1998 1:13 AM
> To:   [log in to unmask]
> Subject:      [TN] PCB Material Change
>
> Currently our PCB house is using a lamination material called Nanya
> di-functional, and are requesting to change to Nanya Tetra-functional.
>
> They would also like to change the soldermask they use from Taiyo PSR
> 4000
> to Tamura DSR 2200.
>
> They state they have run extensive tests and found the substitute
> materials
> to be as good or better than the current material they use.
>
> Since I am not familiar with these materials I was wondering if any of
> you
> technetters have any comments with regards to whether you think this
> would
> be an acceptable change or not.
>
> You input with regards to this matter is, as always, greatly
> appreciated!!
>
> Thanks,
> Kathy Palumbo
>
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