I've had good luck using omnicoat as an adhesion layer over Cr, followed by the standard SU-8 formulation (not 2xxx or 3xxx). Omnicoat is available from Microchem. This will work fine as long as your SU-8 won't have long-term exposure to any weak base solutions (such as a positive photoresist developer) which will remove / undercut the omnicoat (and release your SU-8). - Kevin On Mon, Feb 21, 2011 at 11:35 PM, marlon menezeswrote: > I am currently using SU 8-2xxx series but are having problems with adhesion on > Cr coated substrates. KMPR is advertised to be superior to SU 8 for its adhesion > to metals. However, I have not seen any literature that talks specifically about > Cr. I checked with Microchem as well with no luck. Any info would be greatly > appreciated. > Regards, > > Marlon