Hi All,

I can't answer this question about sapphire but I have a good quantity of
used sapphire wafers and I wondered if anyone knows of a use for them. They
are in open cassettes and 3" in diameter.

Thanks,

Jeff Besterman
Addison Engineering
150 Nortech Parkway
San Jose, CA 95134
office phone 408-956-5101
office fax 408-956-5111
www.addisonengineering.com

-----Original Message-----
From: David Casale [mailto:[email protected]]
Sent: Monday, June 21, 2010 11:26 AM
To: [email protected]
Subject: [mems-talk] Sapphire contact angle

Does anyone know of a chemical that will reduce the contact angle of
standard DNQ photoresist on sapphire? Chemically it is quite different
than glass and silicon, so HMDS does not seem to work at all. We are
working with non-rotationally symmetric parts, so trying to get the edge
bead down is very important for good contact during photolith, and
proper exposure control for lift off processes that go to the edge of a
part.



Sincerely,

David Casale
R&D Engineer
www.maxlevy.com 
Max Levy Autograph
2710 Commerce Way
Philadelphia, PA 19154 USA
tel: 215-842-3675