I don't know. Ferrite will demagnetize (demagnetize) at low temperature. Many people only know that permanent magnet ferrite has good high temperature resistance. However, its use in low temperature environment is not as good as neodymium iron boron. Let's have a look!

Let's talk about the highest temperature resistance of ferrite, and then low temperature resistance. The difference between the two is really big, with a difference of several Baidu.

The upper limit of ferrite heat-resistant (high-temperature) working temperature is 300 ℃, but it can not withstand such a high low-temperature environment. According to the authoritative test results, the ferrite magnet begins to demagnetize when it reaches about 40 ℃ in the low-temperature environment.

Therefore, some outdoor supplies need magnets, especially in some cold weather in the north, most of them use Nd-Fe-B strong magnetism.