Glossy smooth margins of a casting are due to_____________?
Correct answer: D. Incomplete wax elimination
- A. Shrinkage of alloy on cooling
- B. Investment breakdown
- C. Incomplete gas elimination
- D. Incomplete wax elimination
Explanation
Incomplete wax elimination can leave carbon or wax residues that produce a shiny, glossy casting surface and smooth margins. Investment breakdown usually causes a rough, irregular surface instead.
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