On Thu, 26 May 2016 10:06:54 -0700 (PDT), Tim
wrote:

The "Chinese drywall". Oh man, a mixture of formaldehyde and chalk

That wasn't really the problem. They were using pyrites, probably from
coal production, in the aggregate and it had a high sulfur content.
This would outgas sulfur compounds that burn your eyes and corrode
copper. I think most of it in this country came through Tampa and
Miami with a smaller amount in New Orleans. That is why Florida was
ground zero for this problem.

http://gfretwell.com/ftp/Chinese%20D...of%20cases.jpg

My wife's company, Centex, had their own US based drywall company
(Eagle) so they never had the problem.