Gypsum Products

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

A. Impressions
B. Casts
C. Die
D. Casts and Dies

A. Dry strength
B. Green strength
C. Water strength
D. Compressive strength

A. Which undergoes rapid expansion
B. In which accelerators or retarders have been added according to need
C. In which amount of water of hydration is controlled
D. In which the crystals are all of uniform size

A. Plaster of paris
B. Soluble plaster
C. Anti – expansion solution
D. Die stones

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

A. More water
B. Less water
C. no water
D. None of the above

A. Class II stone
B. Densite
C. Class I stone or hydrocal
D. Model or lab plaster

A. Alpha – hemihydrates
B. Beta – hemihydrates
C. Calcium sulphate dihydrate
D. Orthorhombic anhydrate

A. Tensile strength
B. Wet strength
C. Green strength
D. compressive strength