Adam:

You are getting slivers because you are over-etching.

Etch speed varies, unfortunately, and, often, depending on your set up, can increase as the etcher is used, so what might have been a completely appropriate line speed when you started, is too fast later, and will produce slivering.

Only thing to do to prevent this is to look at your etched panels regularly, and if you see slivering, slow the line speed down..

Actually there is something else you can do, but it is likely prohibitively expensive, and that is put an on-line pH and ORP meter, and inject ammonia gas into the sump when the pH falls (typically overnight) and use ORP to control the air input.

There is more info on etching than you can likely sit through on www.pcbfab.com

Rudy Sedlak
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