I found it interesting that the pad was constructed of Fondag. This is pure calcium aluminate cement. The cement and aggregate are both made of the same clinker, there's just a difference in size of the particles. The aggregate doesn't simply have a physical bond to the cement, there is a chemical bond as well. The aggregate and cement are non-porous. Fondag can resist thermal cycling from -395 to 2000 F. It doesn't shed lime.

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