HEF Group: world leader in surface materials engineering The HEF group is a world-renowned expert in surface materials engineering to support societal and lifestyle changes in two areas: tribology and photonics. From Saint Etienne - a land of industrial innovation and design - to the world - (80% of the activity is carried out internationally), the HEF group is developing a vertical integration model from R&D to industrialization. At the forefront of innovation and disruptive technologies, the group is mainly present in the mobility, construction, new energy, defense and medical sectors... The HEF group, two-thirds of whose capital is held by its employees, is a pioneer in the field of social innovation to accompany its rational growth. The group is committed on a daily basis to preserving the environment, through decarbonization in the mobility sector, new energies and new surface functions, but also in the transformation of its production tools. Today, HEF has 4 divisions: IREIS (R&D), HEF Durferrit, Techniques Surfaces and HEF PHOTONICS, 90 industrial sites in 21 countries and 3,200 employees, 200 patents filed (since the creation of the group).