We reworked PCB's removing the soldermask.

We did not find any chemical.

We used a Mototool with a rubber disk (you can find it in Dentist store).
The rubber disk must be soft enough to avoid to remove the copper. You will
need a skilled operator to do this.


Mauricio


At 01:14 PM 26/04/00 -0600, you wrote:
>We need to remove a small area (0.120" x 0.100") of soldermask from the top
>layer, without removing any of the copper underneath. Is there a chemical
>used to "etch" out this soldermask, and not compromise the copper layer
>underneath? As always, your responses are most welcome
>
>Ivan Barrios
>
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Mauricio Castro
New Products Mgr
CIMME SA de CV
Volcan Vesubio 5079
El Colli, Zapopan, Jal, Mexico, 45070
Tel: (523) 120-9880
www.cimme.com.mx

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