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The 652 type seal is a rod seal designed designed to provide a dry sealing solution specifically for heavy-duty longwall mining applications using water-based fluids. The design is also suitable for standard hydraulic oil applications. The seal is manufactured in a polyurethane shell energised by a high quality O-ring. The 652 also incorporates an acetal anti-extrusion ring to withstand side loads and extreme pressure peaks even with the extrusion gaps, which are the result of using remote plastic bearing strips. The seal shell is moulded in Hythane 181, Hallite's high-performance polyurethane, for easy installation.
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