In gray iron castings of facing sand mixtures, what is the bentonite percentage composition?

In gray iron castings of facing sand mixtures, what is the bentonite percentage composition? Correct Answer 2-3%

In gray cast irons of facing sand mixtures, the bentonite percentage composition is calculated to be 2-3%. Whereas, in the case of green sands, the bentonite percentage is recorded to be around 3.5%.
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