“Friable: A term applied to a material that is easily reduced to a powdery or granular state by crushing or rubbing.”
—API Std 936, Section 3: Definitions
This is a key property considered in refractory evaluation because friability can indicate material weakness after installation.
Therefore:
A (friable materials)is the correct and technically defined term.
The other terms refer to distinct classes of materials not defined this way.
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