Homebrew PCBs

Hi Stefan,
Sorry for the typo, I couldn't write your name correctly.


--- On Thu, 1/7/10, Volkan Sahin <v_sahin@...> wrote:

From: Volkan Sahin <v_sahin@...>
Subject: Re: [Homebrew_PCBs] Dry film tenting problem & pattern plating
To: Homebrew_PCBs@yahoogroups.com
Date: Thursday, January 7, 2010, 9:21 PM







 



  


    
      
      
      Hi Simao,Stephan,

Thanks for your help. 

I no longer use dichromated resist  because of environmental issues.. I tried to get liquid resist from the e-bay seller but couldn't get it. They said there will be a week delay and silence. It is like a ghost company.. I canceled my order and got dry film from think&tinker. 

It seems peroxy-sulfuric  etcher won't etch tin etch resist and it is possible to obtain  stabilizer  from think&tinker in low volume.

Volkan



--- On Wed, 1/6/10, Simao Cardoso <simaocardoso@ gmail.com> wrote:



From: Simao Cardoso <simaocardoso@ gmail.com>

Subject: Re: [Homebrew_PCBs] Dry film tenting problem & pattern plating

To: Homebrew_PCBs@ yahoogroups. com

Date: Wednesday, January 6, 2010, 7:37 PM



 



Volkan wrote: 



> 



> Which etcher can be used for tin or nickel etch resist? Is there any



> practical formula for homebrewers?



Maybe its better to use dip coating of LPI resists filling the holes.



You referred an homebrew resist off PVA and dichromate, other is acrylic



resin and benzophenone (same thing used in dry films) an US based ebay



seller had 50 Lb of this chemical to sell recently. 



If you are using real tin electroplating, you may look to Adam Seychell



work with Ammonium Chloride etchant.



Not ammonium based, the only things i know off as tin resist compatible



etchants are us patents  4144119/4378270  and 4632727. 



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