Dave and all other PWB Fabricators using Chlorine gas ,
     
        What action is being taken in response to the requirements to 
     reduce on site gas to 1,500 lbs by May 26 , 1997 [ OSHA 1910.190] 
     and the total elimination of gas by 6/12/99 Clean air act[ CCA 112 -r]
     
                                                        Mike Covel
                                                        HMSC Tucson , Az.
                                                        
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Cupric Chloride Etchant
Author:  [log in to unmask] at CCGATE
Date:    4/7/97 8:54 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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