Ton,
Use graphite on top of the glass
Shay

-----Original Message-----
From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org]
On Behalf Of Antonius Helvoort
Sent: Tuesday, December 20, 2005 7:14 PM
To: mems-talk@memsnet.org
Subject: [mems-talk] anodic bonding: contaminants at glass top surface

Dear all,

When bonding sodium containing glasses, at the cathode side (top glass
surface) sodium hydroxide can form as a contaminant. This is thought to be
due to the reaction between the migrated sodium and moisture.

This effect could be avoided by chosing a different electrode geometry or
material. Can anyone give me ideas or references for avoiding this specific
problem.

Thanks in advance,