Jiang, The nomenclature is similar to MicroChem's - e.g. the last digits are the nominal coating thickness at 3000rpm. Hope this helps. Formulation % Solids SU-8 2000.2 6.8 SU-8 2000.1 3.8 Lee Pang wpang@ucsd.edu -----Original Message----- From: Jiang Ziling Subject: [mems-talk] Su-8 thickness below 1um? In the next few days I will be trying to dilute Su-8 2025 with the Su-8 2000 thinner, both supplied by Microchem. I wish that at a sufficient dilution ratio the spin-coated film thickness can be as little as 200nm. I don't know if this is possible. I will calibrate films of different thickness of AFM. I hope this thin film can be coated, patterned, hotbaked and used as a permanent passivation layer to protect magnetic sensors from microfluidic liquid flow. The reason why I try this is that it really takes trouble and time to find SiO2 deposition facilities in our lab. If anyone has experience of making submicron Su-8 films, please leave valuable advice! Thanks a lot.