GEM is one of the composite material which is used as backfill to protect the electronic equipments, communication network and to stem the voltage of the electrical power problem. GEM has been commonly used in Indonesia, but it is still imported. Therefore it is important to look for substitution minerals. The main compositions of GEM are silica (Si), Aluminium (Al) and carbon (C ). Therefore, this research focus on the aluminofilosilicate minerals (bentonite, from Karangnunggal, Tasikmalaya), and charcoal. Laboratory experimentations are involved characterizations of raw materials, mineral engineering, and developing formulation and prototype of GEM. The result of this characterizations show that Nabentonite is the most potential material for GEM raw materials (514 Ohm cm).
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