FAQ - Frequently Asked Questions
What does Y35 stand for?
There are various standards for the physical features of ferrite magnets.
- Chinese Standard SJ285-77
- United States Industry Standard (US Ind. Standard)
- International Electrotechnical Commission DIN IEC404-8-1
The standards differ mostly by the defined value spectrums.
Therefore, magnets of different standards can't be compared equally. Our magnets correspond to the Standard Y35 of the SJ-285-77. This standard is somewhat similar to C5 of the U.S. Industry Standard or HF26/18 of the DIN IEC 404-8-1.
The DIN IEC Standard is very common in Europe. The classification number is made up of the simplification of the minimum level of the energy product in kJ/m³ and the coercive field strength iHc in kA/m.
e.g. HF24/16: (BxH)max = 24.0 - 25.5 kJ/m³ / iHc = 160 - 180 kA/m
When we speak colloquially about the "power" of a magnet, we usually mean either the adhesive force on direct contact with a metal plate or the attractive force to a piece of iron (or another magnet) at a certain distance.
The power is not only determined by the magnetic material used; equally important are the following factors:
- Volume of the magnet
- Form of the magnet
- Proportions of the magnet (e.g. the ratio of the diameter to the height of a disc magnet)
- Combination with other materials, e.g. is the magnet mounted on a piece of metal, in a metal pot, or is it "free-standing".