The ASTM C704 standard requires the use of two specimens per sample for testing abrasion resistance:
“The abrasion resistance shall be determined using two 4½ in. × 4½ in. × 1 in. (114 mm × 114 mm × 25 mm) specimens per test sample.”
— API Std 936, Section 6.4.4, Abrasion Resistance
This ensures accurate and reproducible results for quality control in refractory installations.
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