or fiberglass mats. When the core sets, it is dried in a large drying chamber, and the sandwich becomes rigid and strong enough for use as a building material.

Drying chambers typically use natural gas today. To dry 1000 sqft of wallboard, between 1750000 and(-) 2490000 BTU is required. Organic dispersants and plasticizers are used so that the slurry will flow during manufacture and to