Discussion
Assertion (A): The firing schedule for a pressed ceramic includes a slow stage at relatively low temperature.
Reason (R): The binder must burn out gradually or the gas evolved will crack the body.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. The binder decomposes to gas which must escape through a body of low permeability, and heating too quickly generates it faster than it can leave. The pressure cracks or bloats the piece, so the burnout stage is held slow and is often the longest part of the schedule.
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