Plaster of Paris

Plaster of paris is a white powdery slightly hydrated calcium sulphate CaSO4. It is mixed with water to form a paste that hardens quickly to make plaster casts and molds. It’s settling time is 15min – 20min and bears whiteness of 70% - 80%. It has a tensile strength of 7.6kg/cm.

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Detailed Description for Plaster of Paris

Plaster of paris is quick-setting gypsum plaster a fine white powder calcium sulphate hemi-hydrate. It is prepared by heating calcium sulphate dehydrate, or gypsum to 120 degree Celsius - 180 degree Celsius. When water is added to the powder to make a slurry, the slurry can be moulded in a variety of shapes and ways. And as it sets, a firm matrix is created, creating a solid smooth shape.


Factors decreasing setting time:

Hot water





Factors increasing setting time:

Cold water




It is light in weight and more durable.

Low thermal conductivity.

Good fire resistant; hence a good insulator.

Does not shrink while setting hence does not produce cracks upon heating.

Easy to mix with water and so, it is easy to spread and level.

Provides a firm surface on which the colours can settle.

Can easily be moulded into shape.



This plaster paris is not suitable for exterior finish as it is highly soluble in water.

Cannot be used in moist situations.

Skilled labour required for precise application and thus labour cost is high.


Application: Plaster of paris is widely used in medical field for making casts for setting broken and fractured bones post to surgery and plaster works for building. It is also utilized for statues, in dentistry, and toys etc. Black board chalks are also made with the help of this.

As a building material, this plaster powder can be used to increase the fire resistance of the structure. It is often applied as a coating cover over other construction materials. This material can also be utilized in criminal investigations, with POP being used to make moulds of the foot prints.


Raw materials recommended for POP:

Plaster of Paris: when powder gypsum is heated about 1700 degree Celsius, it loses about 1/3rd of its combined water which leads to creation of hemi-hydrate gypsum which is better known as plaster paris.

Water: it plays an important role in mixing the plaster of paris.

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Seema S

A fine material; quality-wise! Posted on 8/12/2016

Make sure that the prices you are being told of POP is in kilogram. So better ask for a kg price only!

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Plaster of paris Posted on 8/9/2016

Make sure that the prizes you are being told of plaster of paris is in kilograms. Specifically ask for per-kg price!

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