INCOR 18 and 21 are permenent magnet materials; they are closely related to Incor 16 (Alloy Digest Co-77, June 1981). Incor 18 and 21 are important to design engineers in many fields. They can be used to design motors that are smaller, lighter and more powerful than those made with conventional magnet materials. They also can be used to improve microwave tubes, magnetic drives and couplings and electronic devices. Incor 18 and 21, like Incor 16, can be used to lower size and weight in a wide range of other products where permanent magnets are used. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on forming and machining. Filing Code: Co-78. Producer or source: Indiana General Magnet Products.