Hi Joe, Thank you for your advice. I have think about the solvent bonding and currently working on it. But still now have not achieved any good result. Can you please advice me any protocol for the solvent bonding please ? Any help will be appreciated. Regards, Mamun Rashid PhD Student Centre for Nano & Microsystems University of Teesside TS1 3BA. U.K www.mamun.info +44(0)164 234 2428 -----Original Message----- From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org] On Behalf Of Joseph Grogan Sent: 13 July 2007 16:03 To: General MEMS discussion Subject: Re: [mems-talk] Polystyrene bonding problem I don't have much personal experience with it, but maybe try solvent bonding. You coat one (or both) sides to be mated with some solvent to melt it a bit and get it tacky, then mate, and it bonds. The trick is to find the right solvent and use an amount and concentration that doesn't distort your features.