Hello, it's depend of the formula of your PDMS. A lot of no cured siloxanes are highly fugitive and building films on all of the clean surfaces. This way they are contaminating a clean room. But there are a few of PDMSs, witch are special produced for a clean room production. Check you vendors (f. e. Dow Corning, GE, Wacker Silicones and so one) to get specifications and product data sheets. With best regards, Vitali Emelianov ----------------------------- caesar research center Group Microrobotics Ludwig-Erhard-Allee 2 D-53175 Bonn, Germany Tel. +49 (0) 228 9656 342 e-Mail: emelianov@caesar.de www.caesar.de/1677.0.html -----Ursprüngliche Nachricht----- Von: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org] Im Auftrag von hammouche khales Gesendet: Freitag, 6. Juli 2007 03:59 An: mems-talk@memsnet.org Betreff: [mems-talk] polymer fabrication Hellos all, I have some questions if there is one ho need to help me! - i need to have some informations for polymer fabrciation (especially using PDMS ), and if there is contaminations problems with CMOS process? - what the clean room class if we need to fabricate bio-chip (or microfluidic devices)? Thanks