EVANOHM alloy R is an electrical resistance alloy with exceptional stability. Its resistivity increases during heat treatment and once obtained does not change significantly even when used at temperatures as high as 392 F (200 C). Resistors made with EVANOHM alloy R show a maximum drift of 5ppm per year over 15 years. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance. Filing Code: Ni-372. Producer or source: Wilbur B. Driver Company.