Noemi, in our lab we normally start from PMMA 8% and we dilute that to 4%. After spinning and curing the dilution, we obtain a final thickness of ~180 nm. We have also diluted down to 2% without any trouble. Let me know if you have any question. Fabio On Thu, 13 Oct 2005, Noemi Graziana SPARTA' wrote: > Dear all, > > I'm starting to work on PMMA 950K 9%.I'd like to reduce viscosity to > operate with a thickness (after spin coating) in the range of > 100-200nm.I'd like to know if the procedure of dilution in chloro > benzene is a good solution or if it's raccomended to buy a new bottle > with proper viscosity. > > Thanks in advance > Noemi