Ruilin,
       If it is high humidity a hydrophobic coating on the SU8 and the
mask will fix it.  Bill Moffat

-----Original Message-----
From: mems-talk-bounces@memsnet.org
[mailto:mems-talk-bounces@memsnet.org] On Behalf Of Javier Crespo
Sent: Thursday, October 23, 2008 7:09 AM
To: General MEMS discussion
Subject: Re: [mems-talk] SU-8 layer stick to mask after exposure

Dear Ruilin,

It could be a high humidity in the environment.

Do you have the same environment conditions as before?

Good luck,