In gray iron castings of facing sand mixtures, what is the bentonite percentage composition?
A. 2-3%
B. 3-4%
C. 4-5%
D. 5-6%
Answer:A
In gray iron castings of facing sand mixtures, what is the bentonite percentage composition?
A. 2-3% B. 3-4% C. 4-5% D. 5-6%