GreenTape 9K7 low-temperature co-fired ceramic material system is for advanced high-frequency, microwave and millimeter wave electronics circuits. Is a Pb-free glass-ceramic dielectric tape; comes with compatible gold and silver conductive materials, as well as co-fired embedded resistor materials. Is said to enable advanced high-frequency circuits 100 GHz and beyond.
 
DuPont Microcircuit Materials, http://mcm.dupont.com