Whether gypsum plaster is heat resistant?

Pres-historic man did not recognize the value of plaster as a fire resistant material. Several factors affect the behavior of a plastered building element, when exposed to fire.


A number of plasters are used in plastering, among them gypsum plaster offers better advantages, in terms of smooth finish coat, strength, curing time, good insulation, shrinkage crack resistant, light weight and resistant to fire. It is due to the physical property of gypsum plaster, consisting of 66 percent of hemihydrate calcium sulfate plus other two materials added at the factory to control setting time and working qualities.

When exposed to fire the fully hydrated gypsum is calcinated  or will change back to hemihydrate calcium sulfate at about 130 Celsius and changes to anhydrous calcium sulfate at about 175 Celsius. Both these phase changes are endothermic. Also, the chemically combined water released, representing 21 percent by weight of the original material, plus additional free water ordinarily present is vaporized . Consequently, great quantities of heat are absorbed without causing temperature increases during the calcination of gypsum. This fact makes gypsum plaster an important material for the fire protection of buildings.

Gypsum by nature has a physical property of high cooling factor, because of the percentage of water and the chemical composition of the salt that is naturally occurring as a raw material. 

One of the best advantages of gypsum plaster, that impress a common man is, the touch and feel factor. One will be mesmerized to see the finish and feel the difference once he/she touches the gypsum plastered surface. The temperature of the surface will be cool enough that one will say, this is
AWSOME! 

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