Na2O-K2O-SiO2-B2O3-Al5O3-P2O5 (NKAP) glasses with low melting temperatures were obtained by melting. NKAP glass/ceramic composite ULTCC (ultralow temperature co-fired ceramic) materials were prepared at sintering temperature (< 700 degrees C) by mixing traditional ceramic materials (alumina, quartz and zirconia) and low melting NKAP glasses. Quartz and monolithic zirconia can form stable composites with low melting NKAP glasses. Thus, we prepared ULTCC composite materials containing high amounts of quartz and zirconia. However, alumina and NKAP glasses partially reacted during sintering. Sintering temperature of NKAP glass/ceramic ULTCC composite was lower than 680 degrees C with the minimum sintering temperature of (similar to)550 degrees C. All samples containing NKAP glass/quartz ULTCC composites demonstrated excellent dielectric permittivity (equal to 6.51 with loss (similar to)8 x 10(-3)) and mechanical bending strength equal to 82 MPa. Our results can be used for fabrication of multilayer ULTCC packaging structures with tailored physical properties.