The correct answer is from gypsum.
Key Points
- Plaster of Paris is manufactured by heating gypsum at 423K or 150°C/300° F.
- On heating gypsum at 423 K, it loses water molecules and becomes calcium sulfate hemihydrate.
- This product is known as the plaster of Paris.
Additional Information
- Characteristics of Gypsum Plaster:
- Plaster of Paris is usually a white dry plaster powder.
- It can be effectively worked with metal apparatuses or even abrasive sheets and can be shaped as per the requirements.
- The strength of plaster of Paris is not as strong as other compounds and it often requires external support when a large amount is used.
- It is often applied in the form of a quick-setting paste with water.



