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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 C87/87M, C91/91M, C109, C141, C311, C472, C579 and C942, and AASHTO T 106M.
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