Profile: The Electric Materials Company manufactures electrical commutators, AC rotors, copper extrusions, forgings, and castings. Our products are used in electrical power, mining, steel mill, nuclear, transportation, and architectural industries. We are an ISO 9001:2015 certified company. Our V-bound commutators are named for the internal v-shaped configuration that retains the copper bars and mica segments. The copper bar and mica segment pack are bored with a v-shaped groove on each end of the pack. The mica v-rings are used as electrical insulation between the copper segments and the steel parts. The most common angles for these commutators are 3 degrees on the outer angle and 30 degrees on the inner angle.