Homebrew PCBs

I bought a plastic Coleman cooler to hold my cupric chloride etchant.
The manufacturer says this is made of polyethylene. Is this likely to
stand up well, or at all?

Grant

On Friday 04 April 2003 11:25 pm, grantfair2001 wrote:
> I bought a plastic Coleman cooler to hold my cupric chloride
> etchant. The manufacturer says this is made of polyethylene. Is
> this likely to stand up well, or at all?

Polyethylene is a good choice for caustic and acidic liquids.

-- 
Ned Konz
http://bike-nomad.com
GPG key ID: BEEA7EFE

Yes. Polypropylene, and polyethylene are the two most common plastics for 
containers and packaging and are have very good chemical resistance.

I've been playing around with cupric chloride solutions, trying different acid 
and copper strengths, and found that the recipe described on Rex Allers cupric 
chloride etching web page is far from optimum. If the copper concentration is 
greatly increased the etch rate can triple. I have to buy new hydrometers 
because the density is well above 1.2 which is the highest I can currently 
measure. I'll let you know how it goes.



grantfair2001 wrote:

> I bought a plastic Coleman cooler to hold my cupric chloride etchant.
> The manufacturer says this is made of polyethylene. Is this likely to
> stand up well, or at all?
> 
> Grant
> 
> 
> 
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El Cheapo Hydrometer

Here is an idea: Use a small test tube with a few lead fishing weights at the bottom for a hydrometer. Seal the top, drop it in the etchant solution when it is at ideal density (or prior to first use), then mark off the float line with a permanent sharpie marker.

I'm thinking that would provide sufficient information.. since you really don't need to know the actual density value.. just wether it is too high or low.

~Rolan





--- In Homebrew_PCBs@yahoogroups.com, adam Seychell 

> 
> I've been playing around with cupric chloride solutions, trying different acid 
> and copper strengths, and found that the recipe described on Rex Allers cupric 
> chloride etching web page is far from optimum. If the copper concentration is 
> greatly increased the etch rate can triple. I have to buy new hydrometers 
> because the density is well above 1.2 which is the highest I can currently 
> measure. I'll let you know how it goes.
> 
>