Simple answer: Yes alkaline etch can be used for fine lines (Sub. 4 mil). I've manufactured plenty of high volume designs with alk. etch that were 4&5 mil lines, and have built other products with 2 mil lines. With that said, it is true that for innerlayers cupric etch can be more controllable for mixed copper designs, and for that reason is usually used for inners. I think that it is important that you understand all the variables that influence fine line etching, and make a decision based on what is best for your facility, but if you're looking to just do 6&6 than alk. etch is just fine. Remember, there are plenty of people etching boards in 5 gal buckets. Building a circuit board isn't brain surgery, we just like to think it is sometimes! Scott [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************