Faceplates (etching aluminum?)

[Isac Georg Jensen]

Martin Czech wrote:
> 
> ... If I try to get some photoresist on
> something there will always be dust particles, soaking up the thin
> photo film in their neighbourhood, i.e. my photoresist gets  ugly
> "holes".  Do you have a cleanroom at home ?
> 

No, but I have a restroom :) No, but seriously ... I wish I had, but
instead I have made a box (1m x 1m x 1m) with one of the sides missing.
After preparing the alu for coating I place some old newspapers at the
bottom of the box and sprays water in the box (using a 'device' with a
pump. I think it used to be a hair spray of some sort). The fine water
particles clings to whatever dust particles there may be in the box.
Finally I place the alu at the newspapers and apply a thin layer of
photoresist. I must admit that I do get some dust particles on the
coating, but not nearly as many as without using the water-spray. Works
just fine, most of the time!

> Guess : keep the photoresist and change the etch solution.
> Guess : try H2SO4 (sulphouric acid ?), NHO3 (nitrogen acid ?), mixture out of both.
> A mixture out of both acids will disolve even gold !
> Could work. If you are married, take the ring of, or you're in trouble!
>

I'll certainly try that (maybe this evening). Maybe I should pickup some
of that wonder-stuff that makes hair grow out again, while I'm shopping. 
 
> p.s.: I know a company that uses blue photoresist to coat alu panels.
> Looks cool (blue & "white" alu), also not very sensitive to scratches.

You mean very sensive to scrathes, right ?

--------------------------------------------------------------- 
Isac Georg Jensen
Department of Information Technology
Building 344, 120       
Technical University of Denmark, Phone : +45 4525 3678 
DK - 2800 Lyngby                 E-mail: c908369 at student.dtu.dk
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