Water content in ground refractory material to be shaped into bricks by hand moulding is about ______________ percent?
Correct answer: B. 20
- A. 5
- B. 20
- C. 40
- D. 55
Explanation
Hand moulding requires enough water to provide plasticity, typically about 20% of the ground refractory mix. Lower values make shaping difficult, while 40% or more would produce excessive shrinkage and porosity.
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