117F 47C alloy a bismuth-based eutectic fusible alloy made of five low-melting metals such as bismuth, tin, lead, indium and cadmium. It has a low melting point, can be melted in hot water, is easy to recycle and can be reused many times.
One of the earliest was Presstoff. Invented in 19th century Germany, it is made of specially layered and treated paper pulp.abrasion resistant and tear-resistant.