Have you considered screen printed Ag pastes instead? Dupont and Ferro
(for example) make a line of  pastes which when fired (at around 700C)
will make a solderable thick film 10-15u. You can easily print down to
200u features.

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Tom Rust
Photon Energy Systems
(510) 339-9636 FAX
(510) 912-4662 cell
http://www.photonenergysys.com