Discussion
Assertion (A): Die wall lubricant is used sparingly rather than generously.
Reason (R): Excess lubricant weakens the green compact and must still be burnt out during firing.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives both costs. Lubricant reduces die wall friction and eases ejection, but it also comes between the particles and prevents them bonding, so the green strength falls; and every trace of it must be burnt out in firing, which takes time in the schedule and can cause bloating if it is trapped. It is therefore applied to the wall in the smallest quantity that works.
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