Which of the following is the anti-penetration material introduced in the moulding sand?
A)Coad dust
B)Powdered quartz
C)Black oil
D)all of the above

Question

Quizplus · Accepted Answer

Anti-penetration materials are added to moulding sand to improve its properties, such as reducing the penetration of metal into the sand. Coal dust, powdered quartz, and black oil are all examples of materials that can be added to moulding sand to achieve this effect.

Which of the Following Is the Anti-Penetration Material Introduced in the Moulding