Hi All, I'm interested in making thin PDMS mebranes for a microfluidic application. For this application I would like to make a membrane with a thickness of 40 microns and dimensions of 1cm by 2cm. I have tried to make such a membrane by spin coating but the PDMS layer doesn't come off of the wafer in parts large enough for my application. Does anyone have any hints or information on this subject ? Kind Regards, Heiko van der Linden ******************************* MESA+ Research Institute Twente University P.O. Box 217 7500 AE Enschede The Netherlands *******************************