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Questions and Answers
What is the unique property of gypsum mentioned in the text?
What is the unique property of gypsum mentioned in the text?
- It can easily be shaped and moulded when water is added (correct)
- It can be easily scratched by a finger nail
- It can be heated to turn into powder
- It is classified according to burning and strength
How is low burning type gypsum manufactured?
How is low burning type gypsum manufactured?
- By heating dehydrated gypsum to about 160°C (correct)
- By burning dehydrated gypsum at 700°C–1000°C
- By grinding natural gypsum rock at high pressure
- By adding water to the gypsum powder at normal pressure
What is the characteristic of extra strong gypsum according to the text?
What is the characteristic of extra strong gypsum according to the text?
- It is used for manufacture of moulds (correct)
- It is obtained by grinding natural gypsum rock at normal pressure
- It is very hygroscopic and porous
- It is heated at a temperature of 160°C–180°C
At what temperature is the raw gypsum material heated during the manufacture of gypsum?
At what temperature is the raw gypsum material heated during the manufacture of gypsum?
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What happens when heated, according to the text?
What happens when heated, according to the text?
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Study Notes
Gypsum Properties and Manufacturing
- Gypsum has a unique property of losing ¾ of its water content when heated
Low Burning Type Gypsum Manufacturing
- Low burning type gypsum is manufactured by heating raw gypsum material at a higher temperature
Extra Strong Gypsum Characteristics
- Extra strong gypsum has a higher compressive strength than regular gypsum
Gypsum Manufacturing Process
- Raw gypsum material is heated at a temperature of 150°C during manufacturing
- When heated, raw gypsum material loses its water content and turns into a hemihydrate or anhydrous form
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