The PDMS should be fine - I agree with Joe that it has to be related to the
SU-8 solvent.
Can I ask what exactly you are trying to achieve? If it's what I think it
is, I may be able to assist.

On Mon, Mar 30, 2009 at 06:34, Shao Guocheng  wrote:

> thx for the info Joe. I'll try to bake only the PDMS mold to rule out the
> temperature factor. However, if I understand ur theory correctly, with PR on
> the top side, PDMS mold should bend like a up-side-down bowl. but what I got
> is the other way around, i.e. the side without PR is actually the side which
> expanded.
> any way, thx for the info, I'll let u know if I get this tackled.