Excerpt from The Development and Use of Structural Gypsum: A Thesis
The Gypsum industry first appeared in the United States in the State of New York at the time when the population was mostly restricted to the Atlantic seaboard. As the population moved westward, Gypsum deposits were soon found and developed in Michigan, Iowa, Kansas, California and other States. So the use of Gypsum has developed in its crude and calcined forms up to the present day.
While structural Gypsum has been used in this country for but a few years (three to six), it has been used extensively in Europe for centuries. The European system is based on the use of dead burnt Gypsum, that is calcined to a point of 650°f. Or more, while the American method makes use of Gypsum calcinedat a temperature of about 400 F. Although the highly calcined or dead burnt materials give the greatest strength, the careful preparation and watching which the material requires in addition to the very slow setting property (two to four weeks), makes its use not adaptable to American methods of quick results and efficiency.
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