Homebrew PCBs

I have been getting good results with a 50/50 mix of muratic and 3% 
Hydrogen Peroxide, and I add table salt to accelerate the etching.


On 11/23/2016 19:30, duwaynes@... [Homebrew_PCBs] wrote:
>
> When using muriatic acid and hydrogen peroxide, the etching time 
> mostly depends on the concentration of hydrogen peroxide used.  I 
> usually get 12% peroxide from a beauty supply store.  With this 
> concentration mixed 2 to one with muriatic acid the etch time is 
> around 2 to 3 minutes.  This is a very exothermic reaction, and the 
> solution will get hot very fast..  You really have t o watch closly 
> with this concentration, because it can over etch very quickly.  I 
> usually dilute this down to 6% to get around a 6 minute etch time.  
> With the 3%  from a drugstore I usually have a 12 to 15 minute etch 
> time. Peroxide can decrease in concentration after it ages or exposed 
> to air. in a nearly empty container.
> DuWayne KV4QB
>
> 

-- 
David Martin - NA1MH - Mountain Home, Ar.
-----------------------------------------
How much longer do I have to wait for 'Hollywood' to leave the U.S.A. ?