Chemical properties of pop
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- PLASTER OF PARIS is non-flammable and non-combustible.
- Has generally low chemical reactivity but can act as an oxidizing agent under extreme conditions.
- Decomposes at high temperature to generate toxic oxides of sulfur.
- Reacts exothermically but slowly with moisture in the air or water to form gypsum CaSO4.2H2O.
- It is a white powder.
- When mixed with water (1/3 of its mass), it evolves heat and quickly sets to a hard porous mass within 5 to 15 minutes.
- During setting, a slight expansion (about 1%) in volume occurs so that it fills the mould completely and takes a sharp impression.
The process of setting occurs as follows:
The first step is called the setting stage, and the second, the hardening stage. The setting of plaster of Paris is catalyzed by sodium chloride, while it is reduced by borax, or alum.
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