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What is the full form of POP

POP: Plaster Of Paris

POP Stands for Plaster Of Paris. The most often used chemical compound, plaster of Paris, is used as gauze bandages and as sculpting tools. If we try to grasp the chemistry of this substance, we can see that it has numerous uses in our daily lives. For example, Plaster of Paris is a white powdery chemical compound that is hydrated calcium sulphate and is often made by calcining gypsum. In other terms, we can state that gypsum is typically heated to a high temperature and then used to make plaster of Paris. Gypsum plaster is another name for plaster of Paris. White, dried plaster powder is what the plaster of Paris often looks like. It is easily workable with metal tools or even abrasive sheets and may be moulded to fit the needs. Plaster of Paris' strength is inferior to that of other substances, and when used in large quantities, it frequently needs external support. A quick-setting paste made with water is frequently used to apply it.

Properties Of Plaster Of Paris

Here are a few of the Plaster of Paris's key characteristics:

  1. In powder form, the colour is often white.
  2. Gypsum becomes a solid when water is introduced because crystals start to form.
  3. When it is set, it grows slowly and gradually.
  4. It is extremely resistant to fire.
  5. After drying, a robust surface is created that can withstand typical knocks.
  6. The spread of it is simple.
  7. Easy levelling is possible.
  8. Surface cracking is not a result of it.
  9. Giving an interior finish, it is ornamental.
  10. Salt chloride is a catalyst for the exothermic setting process. Borax or alum impede the setting of plaster of Paris.
  11. Anhydrous calcium sulphate is formed by plaster of Paris at 473K. The term "dead burnt Plaster of Paris" is sometimes used to describe this.

Uses Of Plaster Of Paris

  1. In hospitals, it is employed to fix broken bones.
  2. To create casts for use in dentistry.
  3. Producing blackboard, chalk, cosmetics, toys, home furnishings, cheap ornaments, ornamental items, and statue casts.
  4. A fire-resistant substance used for protection.
  5. Used in laboratory instruments to close air gaps.
  6. For the decorating and enhancement of monuments and structures, exquisite artwork is created using plaster of Paris.
  7. Plaster of Paris is a common component in fire protection and fireproofing solutions.
  8. It is also utilized as a painting base.

Safety Precautions

  1. To avoid breathing in the powder, put on a mask.
  2. When dealing with it, put on gloves to prevent skin contact.
  3. Plaster of Paris should not be washed down the drain since it can block the pipes and drain.
  4. Do not pour or place your hands inside the hardening mixture.

Types Of Plaster Of Paris

Following are the main three plaster types that are frequently used, and they are as follows:

1. Gypsum Plaster

Gypsum is heated to a temperature of 300 degrees Fahrenheit to create this. Additionally, it becomes anhydrite at temperatures over 392 degrees Fahrenheit. The gypsum plaster powder or anhydrite becomes gypsum when combined with water.

2. Lime Plaster

Lime plaster is made of sand, calcium hydroxide, and other inert fillers. Quick lime is created by heating limestone, while slaked lime is created by mixing water into the quick lime. Wet putty or white powder are two common names for it.

3. Cement Plaster

Cement plaster is a compound made of Portland cement, sand, appropriate plaster, and water. To create a smooth surface, it is applied to both the interiors and exteriors. Over the cement plaster, a final coat of gypsum plaster is frequently applied.


In many different fields, plaster of Paris has proven to be quite beneficial. The qualities of plaster of Paris have consistently demonstrated their value, from being a durable building material to being used in orthopaedic applications. Its ability to solidify into a solid mass makes it helpful in a variety of contexts. Gypsum is heated to a temperature of roughly 150°C to create it. It loses water when heated, resulting in the creation of Plaster of Paris powder.

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