Brush Industries Long Life Magnetic Recording Heads DesignGuide 1-3

Core Material	Specifications	Capabilities	Life Expectancy
Mumetal*	Used to encode up to 600 Oersted. To be used for LoCo encoding only. May be used as a read head material for both HiCo and LoCo applications	0 to 600 Oersted	1X
Mumetal/CC*	Mumetal with the addition of ceramic coating for extended life	0 to 600 Oersted	12X
Supermium®*	Long life material used to encode up to 600 Oersted. To be used for LoCo encoding only. Suitable for use as a read head material for both HiCo and LoCo applications	0 to 600 Oersted	20X
Supermium®/CC*	Supermium® with the addition of ceramic coating for extended life	0 to 600 Oersted	102X
Supermium® 2.75*	Used for both LoCo and HiCo applications. Long life material used to encode media up to 2750 Oersted. Will not self-erase LoCo media	Up to 2750 Oersted	20X
Supermium® 2.75/CC*	Supermium® 2.75 with the addition of ceramic coating for extended life	Up to 2750 Oersted	102X
Hypermium II*	Used to encode LoCo and HiCo media up to 3500 Oersted. Under certain circumstances, these materials may not exhibit optimum overwrite capabilities on media above 2750 Oersted. Will not self-erase LoCo media	Up to 3500 Oersted	1X
Hypermium II/CC*	Hypermium II with the addition of ceramic coating for extended life	Up to 3500 Oersted	12X
Hypermium I*	Used to encode media up to 5000 Oersted. Cannot be used in systems that have both HiCo and LoCo tickets. Residual magnetism causes erasure of LoCo media	Up to 5000 Oersted	2X
Hypermium I/CC*	Hypermium I with the addition of ceramic coating for extended life	Up to 5000 Oersted	20X

* This is only a guide to core material selection. Many factors will affect the choice of core material, such as high speed encoding, combined read and write requirements and many more. Please talk to a Brush Industries engineer to help you specify the correct material for your specific application.