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: Role of Alumina in Glazes.
Alumina (Al2O3) is a vital component in glaze recipes, contributing to glaze stability and surface hardness. Its inclusion enhances glaze durability and wear resistance.
Step 2: Evaluation of Choices.
- (1) Decreases melting point: False. Alumina increases the melting point of glazes.
- (2) Inhibits firing bubbles: False. While other components address bubbles, alumina's function is not bubble prevention.
- (3) Enhances durability and hardness: True. Alumina strengthens glazes, resulting in a hard, durable surface.
- (4) Imparts a metallic appearance: False. Alumina does not create a metallic finish.
Step 3: Determination.
Therefore, the accurate option is (3) It provides durability and hardness.