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Gypsum products and applications
Short answer
Plaster of Paris is used for moulds, false ceilings and decorative work. Gypsum plaster provides smooth wall finishes; gypsum board is used for partitions and false ceilings. Gypsum blocks, wall putty and cement additive (2–5% to control setting) are also common.
Write short notes on gypsum products available in the market and their applications.
Gypsum is hydrated calcium sulphate (). On heating at about 130–160 °C it loses water to form plaster of Paris (), which sets quickly when mixed with water.
Products available and their applications
| Product | Application |
|---|---|
| Plaster of Paris (POP) | Moulds, false ceilings, decorative cornices, ornamental work, finishing coat for walls, joint filling |
| Gypsum plaster (wall plaster) | Single-coat internal plaster on brick or concrete; smooth finish without cement |
| Gypsum board (plasterboard, drywall) | Partitions and false ceilings; light, fire-resistant, easy to fix |
| Gypsum blocks and tiles | Non-load-bearing partition walls and ceiling tiles |
| Wall putty | Smooth base for painting |
| Gypsum as cement additive | About 2–5% gypsum is added to cement clinker to control the setting time |
| Gypsum floor screed | Self-levelling floors |
Advantages: fire resistance, good thermal and sound insulation, smooth surface, quick setting. It is not suited to damp areas (unless water-resistant board is used).
✓ Answer checked by Claude Opus 5.5 (high effort)
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