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The HEF Groupe is a world leader in surface engineering, capable of proposing to its customers, a total service ranging from research, through industrial development and technology transfer, to the utilization of processes or the supply of components. HEF Durferrit located in more than about twenty countries. HEF's key expertise is in: - Friction rings and components, - Tribology and functionalization of surfaces, - Thermochemical treatments , controlled liquid ionic nitriding treatments, - PVD and PACVD, such as DLC (Diamond-Like Carbon),
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