Asbestos liner is used in a casting ring to________________?
Correct answer: C. Permit expansion of the world
- A. Facilitate venting of the mold
- B. Retard the heating of the investment
- C. Permit expansion of the world
- D. All of the above
Explanation
A ring liner provides space for the investment to expand during setting and heating instead of being rigidly confined by the casting ring. Its principal purpose is therefore to permit expansion of the investment, despite the apparent typographical error in option c.
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