Question

What role does alumina play in glaze formulation?

• A. It reduces melting temperature.
• B. It prevents bubbles during firing.
• C. It provides durability and hardness.
• D. It gives metallic finish.

Hint:

Alumina enhances the durability and hardness of the glaze in ceramic work.

Answer 1

The Correct Option is C

Step 1: Understanding Alumina in Glaze.
Alumina (Al2O3) is a crucial ingredient in glaze formulation, providing stability and hardness to the glaze surface. It is known to improve the durability of the glaze and enhance its resistance to wear.
Step 2: Analysis of options.
- (1) It reduces melting temperature: Incorrect, alumina actually raises the melting temperature of the glaze.
- (2) It prevents bubbles during firing: Incorrect, while other ingredients help with bubbles, alumina is not used for this purpose.
- (3) It provides durability and hardness: Correct, alumina strengthens the glaze and gives it a durable finish.
- (4) It gives metallic finish: Incorrect, alumina does not provide a metallic finish.
Step 3: Conclusion.
Thus, the correct answer is (3) It provides durability and hardness.