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Subject: Re: [Homebrew_PCBs] Water glass etch resist

From: Adam Seychell <adam_seychell@...>
Date: 2004-01-14

Steve wrote:

> --- In Homebrew_PCBs@yahoogroups.com, "pebo festus" <mebo31@y...> wrote:
>
>>i was just wondering if any one has tried putting water glass (sodium
>>silicate) in a printer cartarage, printing the traces, ...
>
>
> Yikes! Corrosive, at least it is to flesh.
>
> http://ptcl.chem.ox.ac.uk/MSDS/SO/sodium_silicate.html
>
> http://www.infoplease.com/ce6/sci/A0851590.html
>
> Steve



The sodium silicates are alkaline, so any contact from acidic
copper etchants will only neutralize and you end up with a
solution of silica gel (colloidal SiO2) and the salt.