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A change in the length of a specimen measured before and after heating to a specific temperature is referred to as:
Correct Answer: B
Permanent linear change (PLC)measures the irreversible dimensional change of a refractory specimen after it is subjected to a high temperature for a specified duration. It is expressed as a percentage of the original length. This property helps evaluate the stability and thermal compatibility of refractory materials during service. This is distinct from: Modulus of rupture (A): a strength test under bending. Modulus of elasticity (C): a measure of stiffness. Pyrometric cone equivalent (D): a test for melting behavior. Reference: API Std 936 - Referencing ASTM C113 and C356 for permanent linear change testing procedures
