I also think you'll find that was Siegfied's old business. He wanted to pursue fly ash proppants as he saw more promise, the partners wanted to pursue the tiles and bricks. So they split and Coretrack acquired the patents and technology. This is old news - ask around, many people know the back story (then again, they have done their research)
If you ask the right people you'll even see the had private offers for funding they turned down, which they later regret
All that shows is the MD backed the right horse. Fly ash proppant is a much hotter market than fly ash based tiles and bricks
Thanks for spamming that Vecor point, but next time provide detail