Homebrew PCBs

Hi Dwayne:

Cupric chloride will attack stainless steel.

                                    Best regards

                                    Donald Aitken
  ----- Original Message ----- 
  From: Dwayne Reid 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Saturday, April 26, 2003 12:54 PM
  Subject: Re: [Homebrew_PCBs] Homemade PCB holders for etcher


  At 11:09 AM 4/26/03 -0700, Mike Putnam wrote:
  >Dwayne,
  >Did you find the Ammonium Persulfate to have a short life for production
  >work? I did not use it because of the life of the mixture. Was just
  >wondering about your experience with it.
  >-Mike

  We don't do production, only prototypes.  But yes - we found that the shelf 
  life was short (days, weeks) until we covered (sealed) the etch tank while 
  we were not using the system.  That seemed to let us get several months out 
  of each batch of etch.

  Disposal is a minor pain - we asked our local university to help us deal 
  with spent etchant in a safe and legal fashion and they came up with a 
  simple neutralization scheme that works well and is very inexpensive.

  I'm definitely interested in alternative etch techniques.  I find the 
  discussion on CuCl fascinating and am wondering if I should consider trying 
  a batch.

  But I've read some concern about CuCl attacking stainless steel and am 
  hoping that someone can tell me if storing and using CuCl in a stainless 
  steel tank with a stainless steel immersion heater is practical.

  Thanks!

  dwayne

  -- 
  Dwayne Reid   <dwayner@...>
  Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
  (780) 489-3199 voice          (780) 487-6397 fax

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