Hello !

You can try cross-linking at 65 C for 45 minute only.

Best regards,
Osman Omran

-----Original Message-----
From: Ali M. Koupaei
Sent: Thursday, May 26, 2011 11:34 AM
To: mems-talk@memsnet.org
Subject: [mems-talk] PDMS peel off problem

Hello all!

I made PDMS on a patterned silicon master; however after cross-linking at
50oC overnight, the PDMS film cannot be removed from the master uniform and
nicely; in fact the master is gone and PDMS can only be removed partially so
much so no patterned PDMS can be achieved.

Does anyone have any idea how I can solve this problem and what is wrong
with the master? As usual I am using a 10:1 ratio of elastomer to
cross-linker. For another master I do not have the same problem and PDMS
film can be thoroughly removed from the master and nothing remains on
master.

Thanks a lot!
Ali