FAQ - Frequently Asked Questions
What does Y35 stand for?
Y35 describes the grade of the magnet material used, according to the Chinese Standard SJ285-77. This is a common standard in China that we use as well.
The exact physical values can be found in the table Physical magnet data.
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".