Dear All,

We are considering going in for a plasma etch machine . We are mainly into high reliability multilayer boards for space and military requirement. We are MIL PRF 55110G approved too. We are currently doing the sulphuring etch back over and above the desmear process. We wanted to consider all the pros and cons of the process including the process results, the extent of etch back effect, process control etc. We felt after studying the microsection that, the 3 point contact that we achieve with a sulphuric etch back is not there in a plasma etched board. Can you please give us your view points on all aspect wrt plasma etch in comparison to the sulphuric acid etch back

Rgds

Pradeep Menon
Micropack Limited

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