For sand-blasting of glass wafers you can contact:
Little Things Factory
Ehrenbergstr. 11
98693 Ilmenau
Germany
[email protected]

They produce vias of 500µm diameter into 1mm thick
glass substrates. May be they can
help you with your special problem.
Kind regards
Heike Bartsch de Torres

__________________________________________________________________
Do You Yahoo!?
Gesendet von Yahoo! Mail - http://mail.yahoo.de