Hi Mike, Thanks for getting back to me. Can you give me the name of the surfactant, and procedure to treat the channel with that.. Thanks, Vishwa >Gore-Tex is one commercially available. >Otherwise, when using any liquid through micro-channels, you want to degas >it as much as possible. One way is to put it into an ultrasonic bath for a >while while heating. >You might also use a surfactant to help the bubbles move along if they're >getting stuck to the channel features. >Mike