Re: Static Electricity and Ferric Chloride (argh!)
- From: "amdx" <amdx@xxxxxxxxxxx>
- Date: Sun, 18 Feb 2007 06:54:42 -0600
On reflex, I jerk back from the heater, scattering and spilling the
contents of the etchant container. The etchant gets all over my hands,
the floor, my coat, and the heater. Luckily, I was able to avoid serious
injury and minimize staining, but I can't trust that heater any more. I
think the FeCl just ate through the paint before stopping, but I can't be
sure.
Next time I get an idea like this, I'm either going to be more patient,
or if I want to move the etchant container, I'll put the lid on first.
Either one would have prevented the whole situation, and at the worst I'd
be disappointed by a bad board. They're a lot cheaper than a heater.
Ok, my ferric chloride story, I'm etchimg pcbs in a ¼" glass tray I made
Using silicone to stick sides to a 12"x12" bottom. Working on my wife's NEW
stove that has stainless steel burner covers. To heat the solution I
decided to leave
the cover on the burner and set the burner on the lowest setting. So, I'm
etching
along just fine until I notice a little etchent on the porcelain, the bottom
piece of
glass developed a crack. Now the etchant leaked on to the stainless steel
burner
cover and onto the stove top, down the front and into the burner hole.
After a major clean up, the only real damage was to the stainless burner
cover,
It has a deep etched line where the crack in the glass was.
I had used this method 5 or 6 times before the heated glass became a
problem.
BTW the best trick I learned about etching is to float the pcb on top of
the
etchant. Apply a piece of tape to the back side of the pcb to make a little
grab
point and just float it on top of the etchant. Etching goes much faster, I'll
let
others explain why.
Mike
.
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