Hi,
I haven't used polyurethane myslef, but some of my groupmembers use Norland
Optical Adhesive (NOA), which is photocurable polyurethane, in soft lithography.
I heard NOA is pretty easy to work with.

Best,
Huaibin Zhang

---- Original message ----
>Date: Tue, 10 Oct 2006 09:42:37 +0200
>From: RABBIA Laurent 
>Subject: [mems-talk] Polyurethane molding
>To: [email protected]
>
>Hello everybody,
>
>Who has already mold polyurethane ?