How to Prevent Air Voids When Pouring a Cast

What are the causes of air voids formed on pouring a cast?

1) Putting too much material in the mold at one time

2) Flowing the mix too fast from tooth to tooth

Answer:

The causes of air voids on pouring a cast include putting too much material in the mold at one time and flowing the mix too fast from tooth to tooth.

Air voids can be a common issue when pouring a cast. Understanding the causes and preventive measures can help in achieving a smoother finish on the cast without any air voids.

Preventive Measures:

1. Use a vibrating table: Vibrating the mold can help in releasing trapped air bubbles and ensuring a smoother surface.

2. Proper pouring technique: Pour the material slowly and steadily to allow the air to escape naturally.

3. Tap the mold: Lightly tapping the mold can help in dislodging any air bubbles before they get trapped in the material.

4. Use of mold release agents: Applying mold release agents can help in creating a barrier between the material and the mold, preventing air entrapment.

5. Proper mixing: Ensure that the mix is well blended to avoid air pockets that can lead to voids in the cast.