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HM-298 Rubber Tamper for Cube Molds is constructed of hard rubber with a Durometer Shore A Hardness of 80. It is required by certain specifications when consolidating mortar or grout specimens into smaller molds. Required standards are ASTM C87, C91, C109, C141, C311, C472, C579 and C942, and AASHTO T 106M.
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