Clear PCB Etchant

[Fraser, Colin J]

> -----Original Message-----
> From: keithw at cix.compulink.co.uk [mailto:keithw at cix.compulink.co.uk]
> Sent: 14 September 1999 13:49
> To: synth-diy at mailhost.bpa.nl
> Subject: Clear PCB Etchant
> 
> I am about to buy some more ferric chloride for some major 
> etching but I am 
> wondering if I should try this clear, odourless etchant that 
> is being sold these -
> 
> days.Doing large boards with FC takes ages as I don't have a 
> bubble tank and 
> this clear stuff claims etching time of 6 to 8 mins at 40-45 degrees.
> As I am about to etch an MS20 main board I would like 
> something a bit more 
> speedy.
> Anyone used this clear stuff? How does it compare?

I use the Press'n'Peel brand clear etchant in a heated bubble tank, and I
wouldn't dream of going back to FeCl.

6 to 8 minutes sounds about right for a fresh solution of heated etchant,
although the times get longer the more you etch.
You can see the copper disappear from the board right before your eyes, so
you can always etch for exactly the right length of time.

I had problems with my tank - the sealant around the glass started to leak
after several months, so you're better off with a single piece moulded tank.

I rebuilt my tank with silicone sealant holding the glass together, which
works well so far - so if you can find somewhere that will cut you some
pieces of 5 or 6mm glass, you could build your own bubble tank.
You'd just need a heater, an aquarium pump with some plastic tubing for the
bubbles, and a suitable frame to hold it up in.

Add a plastic frame or some titanium wire for holding the pcbs and you're
off.


Colin f