Discussion
Refractoriness under load is a more useful measure than refractoriness alone because a lining
Answer: C
Correct answer: carries weight while it is hot
A refractory in a furnace roof or wall carries the load of the structure above it at working temperature, and many materials that resist high temperature unloaded will deform under even modest stress when hot. Refractoriness under load applies a specified pressure while heating and reports the temperature at which deformation begins, which is the figure that matters in service.
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