Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "wbblair3" <wbblair3@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, February 22, 2006 6:17 PM
Subject: [Homebrew_PCBs] Safe CuCl etchant storage?


>I realize that a glass container would be safe for the storage of CuCl
> etchant with respect to acid resistance, but breakage would be the
> obvious problem there. What sort of commonly available containers
> normally intended for other uses would be safe to store this type of
> etchant (I've always used FeCl3 etchant in the past).
>
>>From what I can find about polypropylene's (PP) resistance to HCl:
>
> http://www.lamtec.com/chemical-resist2.htm
>
> it appears that containers marked PP (like the common plastic food
> storage containers one can find anywhere) might be OK for use as
> etchant tanks/baths, but I wonder about the suitability of PP for
> storage. The sealing methods used on the PP food-related containers
> I've seen that were designed for the storage of liquids don't look
> adequate for the storage of an acid (dropping a container full of
> orange juice and making a mess because a spout pops open is one thing,
> having HCl spray all over your floor is an entirely different sort of
> thing).
>
> Of course, it goes without saying (but I'll say it anyway) that the
> use of food containers for storage would require that they be clearly
> marked with the words "POISON" and "ACID" in large, bold letters (in
> addition to the words "CuCl Etchant" which wouldn't mean anything to
> most people) and kept out of the reach of children. And, for that
> matter, any container used should be marked as such.
>
> Anyway, what are those of you who are using this etchant using for the
> safe storage of it?

I store FeCl3, cupric chloride and NaOH in used plastic milk containers.

Leon
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