Creative Speculation
In reply to the discussion: 9/11 Debunked: "Molten Metal" Explained [View all]AtheistCrusader
(33,982 posts)Which is done commercially and in the lab by heating it to between 600c and 900c in a reducing atmosphere, like carbon monoxide. End product is calcium dioxide and sulfur dioxide.
You see, heat liberates the H2O locked in that CASO4+2H2O gypsum.
Again, I don't know if his test used like for like gypsum. Some has additives that might prevent this, such as silicate fibres for fire resistance, or additives to prevent water damage. There are variations in composition of such drywall over time, such as the 2006-2009 fuckup with extra bonus sulfur dioxide in commercial drywall from China that corroded pipes in walls, and made people sick. You have to test with like for like materials from the initial construction of the building, from the same sources, PLUS take into account remodels on many different floors (an acre at a time) over the lifespan of the building.