Plaster of Paris

• Plaster of Paris is a popular chemical substance that is utilized most commonly for sculpting materials and in gauze bandages.
• Plaster of Paris is a white powdery chemical compound which is hydrated calcium sulphate that is usually obtained from calcining gypsum.
• The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate.
• Hardening of plaster of Paris is a hydration reaction, which is the reverse of the dehydration of gypsum.
• Plaster of Paris quickly sets to a hard mass when made into a thin paste with water.

Source: NCERT Class 10