Binder in phosphate bonded investment is______________?
Correct answer: C. Magnesium oxide & Monoammonium phosphate
- A. Magnesium oxide & Phosphate
- B. Magnesium oxide & Phosphoric acid
- C. Magnesium oxide & Monoammonium phosphate
- D. Magnesium oxide & Ortho Phosphoric acid
Explanation
Phosphate-bonded investment uses magnesium oxide as the basic component and monoammonium phosphate as the acidic phosphate component; their reaction forms the phosphate binder. Phosphoric acid alone is not the usual binder formulation.
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