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Refractory
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===Refractoriness=== Refractoriness is the property of a refractory's multiphase to reach a specific softening degree at high temperature without load, and is measured with a [[pyrometric cone]] equivalent (PCE) test. Refractories are classified as:<ref name="IspatGuru" /> * '''Super duty:''' PCE value of 33β38 * '''High duty:''' PCE value of 30β33 * '''Intermediate duty''': PCE value of 28β30 * '''Low duty''': PCE value of 19β28
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