Temperature T , in °C factor A factor B , in MPa 40 0.0000139 1.38 40 0.000535 52.1 40 0.002 69.6 40 0.006 85.5 40 0.04 103 40 0.1 103 205 0.0000158 1.38 205 0.000361 31.9 205 0.001 37.9 205 0.01 56.2 205 0.0283 67.2 205 0.1 67.2 315 0.0000165 1.38 315 0.000319 26.8 315 0.001 32.8 315 0.01 49 315 0.0281 58.3 315 0.1 58.3 425 0.0000174 1.38 425 0.000275 21.9 425 0.0015 29.4 425 0.01 40.7 425 0.03 49.6 425 0.1 49.6