Yes John I realy think that it is important. in some case; you can have more than 10-15% narrower line than normal line. It depends on type of etcher, chemistry and resist and so. Better result can be obtained if your board maker use Developer-Etcher-Stripper in one Line and run continiously. But I would fix immage anyway to avoid acid traps. This is only my opinion, probably others have differen experience.
Zlatko


----- Original Message ----
From: John Foster <[log in to unmask]>
To: [log in to unmask]
Sent: Tuesday, November 21, 2006 11:53:02 AM
Subject: [TN] Acid Traps


I would like to ask the board fabricators if acid traps are a real issue.

I normally try to avoid any feature that creates a structure that is less
then 90 degrees.

However I am helping out another group by reviewing their boards and there
are literally
hundreds of acid traps on the board. This board is class 3 and has to be
high reliability.

I have always been taught that they can be a real problem. But have never
quite understood
why.

Any input on this will really be appreciated.

Thanks
John Foster

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