This product is primarily derived from coal- fired electrical utilities which have systems in place to remove sulfur dioxide from flue gasses. F, driving off three- fourths of the chemically combined water in a process called calcining.

Crushed rock is then ground into a fine powder and heated to about 3. The manufacturer receives quarried gypsum, and crushes the large pieces before any further processing takes place. Gypsum rock is mined or quarried and transported to the manufacturing facility. One hundred pounds of gypsum rock contains approximately 2. Gypsum is a mineral found in sedimentary rock formations in a crystalline form known as calcium sulfate dihydrate Ca. 1 – Horizontally Applied Gypsum Wallboard Showing Joints and Framing. A typical board application is shown in Figure 1. When joints and fastener heads are covered with a joint compound system, gypsum wall board creates a continuous surface suitable for most types of interior decoration. It differs from other panel- type building products, such as plywood, hardboard, and fiberboard, because of its noncombustible core and paper facers.

Gypsum board is one of several building materials covered by the umbrella term. GYPSUM BOARD CONSTRUCTIONWHAT IS GYPSUM BOARD? Gypsum board is the generic name for a family of panel products that consist of a noncombustible core, composed primarily of gypsum, and a paper surfacing on the face, back and long edges.

Type of gypsum board pdf writer