I had just made a experimental ground glass panel for a 8x10 .... I
had acid etched it first and then I "lightly" sandblasted it with 240
grit... or I should say faintly as it was just enough to randomly etch
the surface using very low air pressure. The appearance if it had not been
acid etched first would be that you could see thru the glass as looking
thru a very light fog.... I was very pleased with the result... The acid
gives it a very mat finish and the sandblast effect evidently catches more
light and allows for a brighter screen with a more even distribution of
light through out the screen . Be careful not to over do the sandblast as
you will wipe out the acid work and acid etch the screen several times to
get a even etching. .. The combination of the two gives a very pleasing
screen..
If I was to do it over again I would try to acid etch the screen
using a liquid etch and not the paste to give a more even etch and would
lightly sandblast using a 320 grit at a higher pressure..
If your just going to sit there and grind away using a plate of glass
or metal to apply the grit to I would use a 240 to 320 grit..Start with the
240 and then proceed to the 320 if needed. 320 will give you a very fine
etching.. ( 600 grit you are beginning to get into a prepolish phase in
glass
polishing..) ...
> I save all the digests, but that makes it harder to retrieve info too -
> takes a long time to search -
>
> If I use Silicon Carbide to make ground glass, what grade or grades should
I
> use?
>
> Thanks
>
> Murray
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