Gary
I use a "Waterwerks wwp3000n" pond pump which is able to pump water up
to the height of 2.5 meters and does 3000 liters per hour (in other
words about 8.2 feets high and 792 gallons per hour) which works very
well. The rotor of the pump is acutally all coverd with plastics and so
is the housing it resides in. There are absolutely no metal parts within
the stream of the fluid. It was slightly more expensive here (~$50) but
prices are higher here than in most parts of the world so your mileage
may varry. The nice thing about the pump is that it's designed to be
directly put into the pond alsas you could put it directly into the
etchant (even the power cord is isolated good enough to withstand
etchants) which greatly simplfies the design of a spray etcher. Might be
that the pump is not available where you live, but I'm sure similar
products should. Usually the pump housing of these pumps can be opened
easily and therefore you could check in the store before you buy it
wether it suits your needs or not.
HTH
Markus
garydeal schrieb:
>
> Hey, has anyone tried using automotive windshield-wiper fluid pumps to
> spray etchant? In particular, HCl/H2O2 etchant?
>
> Or maybe taken any apart to see if the fluid path is all-plastic? (no
> pesky metal to dissolve?)
>
> Alternatively, is there a suitable small pump available for under say,
> $40? I wouldn't need all that much volume/minute, and just enough
> pressure to get a nozzle to spray reasonably well.
>
> -Gary
>
>