Dave,
     
     We use Sodium Chlorate & HCL to regenerate cupric. We have used this 
     for years with both Oxford VUE and ORP/Conductivity controls to make 
     additions. If you want more details call Ajay Singh at 408-243-1976 
     x7626.
     
     Dan Howell
     408-557-7082(direct line)
     Zycon


______________________________ Reply Separator _________________________________
Subject: Cupric Chloride Etchant
Author:  [log in to unmask] at corp
Date:    4/7/97 8:10 PM


One of our process engineers is contemplating changing the etcher chemistry. 
Potential changes include NaCl or sodium chlorate in traditional cupric 
chloride etching chemistry. Before initiating an evaluation of these 
changes, I would appreciate any responses to the following:
     
Can anyone share any experiences (positive or negative) with using sodium 
chloride in cupric chloride etchant in order to increase etch rate? Are you 
currently using NaCl and if so, have you found any degredation of equipment 
due to corrosion? Any other comments?
     
In the same vein, are there any Cupric etchers out there using sodium 
chlorate as the oxidant as opposed to hydrogen peroxide? Again, any 
positive/negative impacts?
     
Thanks to any and all comments and responses.
     
Dave Rooke
Circo Craft - Pointe Claire 
     
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