TOPHET A is a 80Ni-20Cr alloy recommended for high temperature service. It is recommended for temperatures up to 2100 F. It is also very widely used in chemical applications. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-39. Producer or source: Wilbur B. Driver Company.