Alsey Refractories Company certifies that SMITHFIELD UNBRANDED Medium Duty Firebrick is manufactured at our Alsey, Illinois plant and conforms to ASTM Specifications C-27 – Class 4.1.4 and 4.1.5 for Medium Duty and Low Duty respectively and C-1261-98 (which includes C-24 and C-67), as well as, C-16, C-20, C-24,
C-38, C-113, C-133.

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