inch 127 kv cm for 15 seconds resistance before stress ro was compared with resistance after stress r ref each measured at low stress typically 500 volts mm and the percent permanent change in resistance was defined as equ1 the resistors were prepared as follows a dispersion or paste of the seven parts of the solids indicated below in three parts an inert liquid vehicle 1 9 ethylcellulose terpineol was prepared by conventional roll milling techniques the paste was printed on alsimag 614 alumina substrates bearing prefired pd ag 1 2 5 electrode terminations using a 200 mesh screen to print 25 mm square patterns the pattern was dried at 150 u00b0 c in an air oven for 15 minutes to a thickness of about 25 microns and then fired in a belt furnace to a maximum temperature of about 850 u00b0 c about 8 minutes at peak total furnace residence time was about 45 60 minutes the dried print about 17 microns thick the glasses used in the examples are designated a b and c therein and are identified in table i table 1______________________________________glasses used in examples wt glass a glass b glass c______________________________________65 0 pbo 32 0 pbo 60 0 pbo34 0 sio sub 2 27 0 sio sub 2 32 0 sio sub 2 1 0 al sub 2 o sub 3 11 0 al sub 2 o sub 3 1 0 al sub 2 o sub 3 12 0 tio sub 2 7 0 tio sub 2 10 0 zno 8 0 bao______________________________________ the inorganic materials used herein and their relative proportions are set forth in tables ii v the powders were each finely divided by conventional milling techniques the surface areas being for.