A heated die was then pressed onto each PET film sample for 1 -3 seconds at a pressure of about 80 psi. The die was heated to 300°F, 350°F, and 400°F. Two PET film samples were pressed at each temperature. Resistance of the silver based compositions was measured by placing two Fluke 189 Multimeter probes 3-4 cm apart on the previously marked points of the patterned composition. The resistivity of six samples of the silver based composition, before and after heat stamping, are listed in Tables 1-3. All samples were prepared of the same materials described above.