INDALLOY No. 4 is the metallic element indium. It is a very versatile, malleable and soft metal; it is softer even than lead. Indium remains malleable at temperatures approaching absolute zero; therefore, it is an excellent for a variety of applications including gaskets and seals. It is a useful element to alloy with other metals in the preparation of solders and fusible alloys. This datasheet provides information on composition, physical properties, microstructure, and elasticity. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: In-1. Producer or source: Indium Corporation of America.