Hi all, I have some questions about SU-8 developer. Recently, I have shortage of SU-8 developer (bought from MicroChem). Then, I found that the main ingradient is PGMEA, then I bought a bottle of 99+% PGMEA and hope that it can substitute the SU-8 developer (also it is much cheaper). However, I found that the dissolving rate is not constant over large structure (30-40um) and small structure (15um) on a sample of 5um thick (developed for 1 minutes). Small structure seems need more time to dissolve. My question is are there any difference between SU-8 developer from MicroChem and pure PGMEA? I also look at the MSDS of SU-8 developer, it has 2 chemicals but 99.5% is PGMEA, 0.5% is a 2-methoxypropanolacetate. I would like to know that this 0.5% would make the big difference? Thanks. Yours sincerely, Bill _______________________________________________ Hosted by the MEMS and Nanotechnology Exchange, the country's leading provider of MEMS and Nanotechnology design and fabrication services. Visit us at http://www.mems-exchange.org Want to advertise to this community? See http://www.memsnet.org To unsubscribe: http://mail.mems-exchange.org/mailman/listinfo/mems-talk