I am doing a technology survey which needs comparison data between the two
etch processes used in PWB fabrication: acidic vs. alkaline. I would very
much appreciate to receive data on following items -- please indicate type
of product range, throughput and etch speed, type of etch resist and energy
cost --

1. chemical cost of etching 1 kg copper by cupric chloride and treatment
costs of spent etchant
2. chemical cost of etching 1 kg copper by alkaline etchant and treatment
costs of spent etchant.
3. quality difference between alkaline and acidic copper etching in terms of
defect density / production yields, line width uniformity, undercut, etch
profiles,
4. relevant cost for the of waste water treatment plant which are
attributable to the etch process (only patterning not any microetch or metal
deposition process) in absolute figures and in percentage of total waste
water treatment installation costs.
5. transport cost for spent etchants; conditions of the supplier / recycler
for the etchant "lease".
6. total cost of ownership for etching 1 kg copper by cupric chloride
7. total cost of ownership for etching 1 kg copper by alkaline etchant.

Thanks.

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