How do I know which magnet is applied in my refrigerator door seal?
The flexible magnetic strip in a refrigerator seal is a thermoplastic permanent magnetic extrusion.
The magnetic strip is made of ferromagnetic material in which all magnetic dipoles are permanently pointing in the same direction. It is putting out either an attractive or repellent force on other magnets, and it attracts non-magnetic Ferro magnetic material such as iron and nickel.
A magnet has two places where the magnetic force is the strongest. These are the called the poles of the magnet. One of these poles points itself the north when the magnet is freely rotatable and is therefore called the north pole; the other pole is the called the south pole.
A magnetic strip can lose its magnetic properties promptly when exposed to high temperatures, impact and when it is demagnetized by another magnet. Under normal conditions the loss of magnetic force takes place at a very slow pace.
