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Looking for a process to etch Zerodur - glass ceramic

I am looking for a process to etch Zerodur - glass ceramic.
Until now I etched the Zerodur 'M' by Ammonium bi Fluoride and got smooth surface and full transparency.
Now I tried to etch the Zerodur 'S' by the Ammonium bi Fluoride but I lost the transparency and the smooth surface - actually the Zerodur 'S' block I etched is opaque.

I tried to change the etching parameters time, concentration and temperature but I did not succeed to get the transparency and the surface quality I had before on the Zeodur 'M'.
Do you have any idea what to do ?

Moshe A.
product designer - Israel
January 17, 2011

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It would appear that there was more regular glass in the second material vs a higher amount of ceramic in the first. The fluoride went after any available silicon.

Don't use the second material.

James Watts
- Navarre, Florida
January 19, 2011

I have to work with the Zerodur 's' so I have to find an etching process for this type.

Moshe
- Israel
January 20, 2011