Strong magnets for laboratory demonstration work, magnetizing needles, etc. Ideal for extended classroom use. Painted red, with north pole marked. Sold in pairs, with plated keeper. (6 long). Alnico magnets are very strong for their size and resist demagnetization.
ALNICO MAGNETS Alnico permanent magnets are made primarily from aluminum, nickel, cobalt, copper, iron and sometimes titanium. They can be either cast or sintered.
Cast Alnico is melted and poured into a mold. Once solidified, the material is rough ground and then heat-treated and cooled, sometimes in a magnetic field. When treated in the presence of a magnetic field, the magnet is called anisotropic. This orients the material to take on maximum magnetization and allows a higher gauss level. A cast magnet that is not heat-treated in a magnetic field is called isotropic. After heat treatment and cooling, the material can be ground to specific tolerances and then magnetized.