degrees c and then to about 1100 degrees c at about a 2 degrees c per minute ramp up rate and showed tensile adhesion strength comparable to the sr350 based cement srp850 ge silicones is a phenylmethyl silicone similar to sr355 with greater flexibility at room temperature and above tensile adhesion testing showed about a 30 to 50 decrease in tensile adhesion strength after firing at about 1100 degrees c with srp850 replacing either sr350 or sr355 on a 1 1 by weight basis it should be noted that xylene replaced ethanol in the srp850 formulations formulations were also prepared using about 40 less ethanol and ucon and about 67 more ethanol and ucon than in the standard formulation described above with varying results reducing the amount of ucon by about 75 to about 1 5 wt typical of dispersants emulsifiers allowed the primer to remain well dispersed despite the reduced ucon level and provided comparable tensile adhesion strength formulations were further prepared using about 1 8 times the amount of melox 5y ysz as in the standard formulation described above reducing the organic fraction of the cement tensile adhesion strength after firing at about 1100 degrees c varied and in some cases an improvement of about 30 resulted the ratio of primer material to zy 8 fused ysz was increased in order to increase the proportion of binding silica in the resulting cement the ratio of primer material to aggregate was increased from about 0 29 in the standard formulation described above to about 0 36 and 0 43 both increased ratios showed increased.