Homebrew PCBs

For 1 liter, 700cc distilled water, 270cc HCl and 30cc H202.
Keep your H202 in a very dark and cold place to minimize decomposition.
You can use the mixture until it gets very dark green. Storage is the same
as H202. With time, you will have to add some H202. To check it, just dip
your clean PCB to etch in the mixture for 1 sec. If there is enough H202,
the copper takes a dark brown colour and etching time at 40°C with a 35µm
copper is less than 5 minutes .

--- On Fri, 9/5/08, liquias <liquias@...> wrote:
From: liquias <liquias@...>
Subject: [Homebrew_PCBs] HCl H2O2 etch
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, September 5, 2008, 10:24 PM










    
            Hi,

I got some HCl at 32% and H2O2 at 33% concentrations from our chemistry 

supply shop.

How do I use these materials in order to etch?

Do i need a special container in order to etch?

Do i need an air system inside the tank?

(What are the quantities, and in what order should i mix everything - I 

dont know much about chemistry... )?

Any help will be woderful...

Thanks in advance - 

Liquias.




      

    
    
	
	 
	
	








	


	
	


      

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