Gypsum Material

Question 1

Which is the best indicator of the initial set of gypsum products?

a) Loss of gloss
b) Loss of resilience
c) Decreased compressive strength
d) Decreased elasticity

Answer 1

a) Loss of gloss

Question 2

What is the correct water/powder ratio for this type of gypsum: Dental stone (Type III)

a) 45-50 mL/100 g
b) 28-30mL/100 g
c) 19-24 mL/100 g
d) 30-45 mL/100 g

Answer 2

b) 28-30mL/100 g

Question 3

What is the correct water/powder ratio for this type of gypsum: Improved Stone (Type IV)

a) 45-50 mL/100 g
b) 28-30mL/100 g
c) 19-24 mL/100 g
d) 30-45 mL/100 g

Answer 3

c) 19-24 mL/100 g

This mixture will be like thick cake batter

Question 4

What is the correct water/powder ratio for this type of gypsum: Plaster

a) 45-50 mL/100 g
b) 28-30mL/100 g
c) 19-24 mL/100 g
d) 30-45 mL/100 g

Answer 4

a) 45-50 mL/100 g

Question 5

______ : is measured strength “just after it sets,”

Answer 5

Wet strength

Question 6

_____ : the strength measured when excess water is not present.

Answer 6

Dry strength