Hi all, I have made a microfluidic Opto-Biochip in SU8 2050 on a glass substrate. Now I need to cap this with another optically clear material such as glass, PDMS, PMMA or any other material that may do the job. Up to now we haven't had success in bonding any of these materials to SU8 after post exposure bake. Does anybody know a material and the process that may work as a cap for SU8 chip. Suggestions are greatly appreciated. Thanks Seyed