There are a variety of glass pastes that can be screen printed that will
fire to a thickness of 30u or greater. They come in a wide variety of
melting and firing temperatures and Tce values (which will have a big
effect at that thickness). Most have other components besides SiO2 to
reduce the firing temperature and are designed for specific purposes.
What do you have above and below it?

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Tom Rust
Nanochip Inc
(510) 339-6263
(510) 339-9636 FAX
(510) 912-4662 cell
http://www.nanochip.com