Silicon-Silicon, e.g. having differing Shore A hardness or colors. Both materials are combined with one another by chemical or mechanical methods. First, component 1 is injected (thermoplastic material, metal, glass, silicone) or placed in the mold. Next, the item is overmolded with silicone. This is the method of producing compound parts. Popular multi-component products are items such as steering wheel switches for cars, jet-formers for shower heads, door-bell key or the hydraulic brake systems for kitchen drawers, doors and flaps. SHARE: