Plaster of Paris is the white coloured building material that is used as a protective anddecorative coating on the walls during the construction of buildings. The most common types of POP are gypsum POP, lime POP and cement POP based on the ingredients in it.
The name –
The name plaster of Paris is given because; the material it is made of is usually gypsum. Gypsum was found in abundance in Paris and thus, the name. Plaster refers t a material that is used in the interiors of a building.
The POP is powdery in nature. It is white or off white in colour. The powder is mixed in water to gain required consistency just before it is used. As soon as it is mixed with water, the powder undergoes crystallization and liberates heat to become rigid.
How is POP made?
Gypsum plaster –
To make Gypsum plaster, gypsum is heated up to 150 °C. This powder when mixed with water will again become gypsum. And, the process of becoming gypsum begins 10 minutes after you mix water and will be completed in 72 hours.
Lime plaster –
This is manufactured by mixing calcium hydroxide and sand. Several other inert fillers can also be used. Lime stone or calcium carbonate is heated to convert into quicklime or calcium oxide. When water is added to this mixture, it produces calcium hydroxide. This mixture is also known as wet putty. All you need to do is add some more water before the use. When this powder is mixed with water, the carbon dioxide in the atmosphere will help the POP in setting by converting the calcium hydroxide into calcium carbonate.
Cement plaster –
A mixture of plaster, sand, water and cement is called as cement plaster. This is most commonly used in construction of building because it gives a smooth surface.
This way, there are several types of plasters manufactured in different ways. There are many plaster of Paris manufacturers in the country and you can choose the one that you need. The requirements of your buildings are the thing which determines which plaster you will need.