By Temperature Resistance
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1Understand why ferrite is here at all
Heat is the one area where the cheapest magnet on the shelf beats the most expensive. An ordinary neodymium magnet gives up at around 80 °C; the ferrite magnets in this category are rated for 151 to 200 °C, and part of the range reaches the 201 to 350 °C band.
For a warm plant room, a light fitting, an oven surround or machinery that runs hot, ferrite is often the technically correct answer as well as the cheap one.
2Measure the temperature at the magnet
What matters is the temperature at the magnet under continuous operation, not the temperature of the room. Inside a housing, near a motor or above a heat source, it is routinely far higher than people expect.
If you cannot measure it, estimate on the high side. The maximum working temperature is listed in the parameters of every product, so match it to your worst case, not your average.
3Know what happens at the limit
Below the stated maximum, a magnet gives up a little force while it is hot and recovers on cooling. Once the limit is exceeded, the loss is permanent and the magnet never returns to its original strength.
Overheating also happens during assembly rather than in service. Welding, grinding or drilling near a mounted magnet can push it past its limit in seconds, so do the hot work first and fit the magnet afterwards.
4Do not forget the cold end
Ferrite is the one common magnet material that is more sensitive to cold than to heat. As the temperature falls, its resistance to demagnetisation drops, so a ferrite magnet used in hard frost can lose part of its strength permanently, especially if it is working against an opposing field.
For a cold outdoor application, tell us the conditions and we will advise on a suitable material rather than assuming ferrite is automatically the rugged option.
5Compare the alternatives honestly
- Up to 80 °C: neodymium, if you want maximum force from a small body.
- 80 to 200 °C: higher neodymium grades, or ferrite if the force requirement is modest and the budget matters.
- Above 200 °C: ferrite from the upper band, or samarium where the force has to stay high.
Tip: Do not pay for a high temperature neodymium grade if a ferrite magnet twice the size will do the same job. In a hot machine, the ferrite version often costs a tenth as much and has nothing on its surface that can degrade over the years.
Related categories to the Ferrite magnets by temperature resistance category
- Temperature resistance 151 to 200 °C
- Temperature resistance 201 to 350 °C
- Selection by pull force
- Heat-resistant magnets
- Samarium magnets
- Neodymium magnets by temperature
- Neodymium 201 to 350 °C
- Ferrite cylinders
- Ferrite blocks
- Ferrite rings
- All ferrite magnets
- All magnets
Frequently asked questions about ferrite and temperature
The magnets in this category are rated for 151 to 200 °C, and part of the range reaches the 201 to 350 °C band. That is far beyond an ordinary neodymium magnet, which gives up at around 80 °C. The exact maximum working temperature is listed in the parameters of every product.
Yes, and by a wide margin against standard neodymium. A cheap ferrite magnet works at temperatures where a standard N grade neodymium has already lost force permanently. High temperature neodymium grades do exist and reach 200 °C, but they cost far more, so for a hot application with modest force requirements ferrite is usually the better engineering and commercial choice.
Below the stated limit it loses a little force while hot and recovers on cooling. Above the limit the loss is permanent and does not come back at room temperature. Overheating often happens during installation rather than in service, so carry out any welding, grinding or drilling before the magnet goes in.
More than most people expect. Ferrite is unusual in being more sensitive to low temperatures than to high ones: as it gets colder its resistance to demagnetisation falls, so a ferrite magnet used in hard frost can lose part of its strength permanently, particularly if it works against an opposing field. For cold outdoor use, ask us before choosing.
That is beyond the range offered here. Samarium magnets are the usual answer where high force has to be maintained at high temperature, and for anything more extreme the solution has to be designed rather than picked from a catalogue. Describe your application and we will tell you what is realistic.
Heat is where the cheapest magnet beats the most expensive one. Our ferrite range is rated for 151 to 200 °C, with part of it reaching the 201 to 350 °C band, while a standard neodymium magnet loses force permanently at around 80 °C. We state the maximum working temperature for every product, and because we stock ferrite, neodymium and samarium side by side, our recommendation follows your application rather than our margin.
