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**Figure 9.** Yield stress vs crossover stress for various greases.

Figure 10 shows the relationship between cone penetration and yield stress, where a general negative correlation is established. This figure, once again, shows that the LiC3 grease deviates from the expected trend by a significant amount. This grease appears to have a much lower cone penetration value than the PU2 grease, ye<sup>t</sup> it shows a similar value of yield stress. Because of this, it is not recommended to use this measure of yield stress to estimate cone penetration.
