Category: Gypsum Products

A. Solubility
B. Shelf life
C. Chemical formula
D. Particle porosity

A. Chemical composition
B. Self life
C. Sharpe and size of particles
D. Solubility in water

A. 0.05
B. 0.10
C. 0.15
D. 0.20

A. Stone
B. Plaster
C. Investment
D. All of the above

A. Increased spatulation
B. Adding potassium sulfate
C. Less water powder ratio
D. Allowing setting under water

A. Setting time
B. Setting expansion
C. Hardness of the set product
D. None of the above

A. Slower the hygroscopic expansion
B. Greater the hygroscopic expansion
C. Normal setting expansion
D. No setting expansion

A. Rapid spatulation results in decreased setting time
B. 2% potassium sulphate is accelerator
C. Citrates are retarders
D. All of the above

A. Is wet calcined hemihydrate
B. Has porous and irregular crystals
C. Is a – hamihydrate
D. Has a W / P of 0.2

A. Impression plaster
B. Model plaster
C. Stone plaster
D. Die stone