Only some small portion of the pad was Fondag -- seen here
[image: Screenshot 2023-04-26 at 3.35.22 PM.png]


Good video: https://www.youtube.com/watch?v=zKhJwWymJWE

On Wed, Apr 26, 2023 at 3:30 PM Bruce Perens via Starlink <
starlink@lists.bufferbloat.net> wrote:

> 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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