I am not sure of the temperature limitations of PDMS. If it is the same as most photosensitive material and below 90 C is safe for the sensitizer. The following may work. It is a tried and true recipe for our image reversal process. Set oven at 90 C pull a vacuum of close to 50 Torr to avoid violent out gassing of any solvent. Then fill with pre-heated nitrogen at 90 C. This enters all the available pores of the material that have been vacated by the first vacuum pull. The PDMS now has 90 C Nitrogen trapped in the pores. Then a vacuum to 50 Torr again. At 50 Torr water boils at approx. 30 degrees C and you get dehydration. We repeat this process 2 more times for complete dehydration. Then pull a vacuum to 1 Torr to ensure complete dehydration. If you want to run some free tests let me know. Bill Moffat ________________________________ From: mems-talk-bounces@memsnet.org on behalf of A. AhmadShukri Sent: Wed 11/25/2009 8:54 AM To: General MEMS discussion Subject: [mems-talk] Moisture in PDMS Dear all, I am using water droplets on PDMS surface and am wondering water could be trapped between my features on the PDMS. If so, is there a way to dehumidify PDMS without altering its properties? Thanks, Aimi