Magnet manufacturer

1. Excellent temperature stability up to 1,000° F - 90% of room temperature magnetization is retained up to this temperature.
2. High residual induction - Alnico magnets can produce powerful fields in certain configurations.
3. Material does not corrode.
4. Cast Alnico magnets can be produced in relatively complex shapes.
5. Tooling for cast magnets is relatively low, since sand molds are generally used for the casting process.

1. Alnico materials have low coercivities, meaning that they are easily demagnetized.
2. These magnets are relatively costly since they contain both nickel and cobalt.
3. Cast Alnicos often have casting pores and voids within them - which can be problematic from cosmetics point of view or because large voids may lower expected magnetic flux.
4. The material is extremely hard and brittle and difficult to machine.  

1. Density - 0.265 lbs per cubic inch
2. Saturation magnetizing field required - about 5kOe
3. Manufacturing methods - casting (most common), or sintering.
4. Shapes available - blocks, bars, discs, rings, horseshoes, etc.
5. Grades available - from about 0105 to 0519. (First 2 digits represent BHmax, and second two digits represent Intrinsic Coercivity, Hci.)
6. Sizes - off tool very large Alnico magnets can be cast (for example horseshoe magnets weighing 500 pounds), or small magnets sintered (for example sintered discs, 1/16" in diameter)