Drywall is made from gypsum, a soft mineral, that is pressed between thick paperboard.
Other biggies include paper and paperboard, "drilling mud," kaolin clay, fabric and frozen chicken parts--in particular, chicken feet, beloved by Chinese gourmets.
The paperboard industry was feeling the effects of tremendous overproduction from new mills.
U.S. Paperboard Production in May Up Slightly Over April June 21, 2013 - The American Forest & Paper Association has released its May 2013 U.S. Paperboard Report, which said total boxboard production decreased by 0.6 percent compared to May 2012 but increased 0.6 percent from last month.
June 24, 2013 - PaperAge.com