China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Most of customer all want to buy strong magnets, the namely is what we called strong powerful magnets, someone also called high strength magnet. Due to the different apply surrounding of magnets, might need the strong power magnets which have high temperature resistance. But do you know the strong magnets of high temperature resistance also will demagnetization?
First, let us talk about high temperature resistance magnet:
High temperature resistant magnet is a kind of magnet material that can maintain its magnetic properties in a high temperature environment. Under high temperature conditions, conventional magnet materials such as permanent magnet ferrite and NdFeb will lose part or all of their magnetic properties. Therefore, in order to cope with the magnetic demand in a high temperature environment, it is necessary to use high temperature resistant grade magnets.
The following is the temperature resistance of various magnet materials. Generally speaking, the working temperature exceeds 200 ° C all called the high temperature resistance magnet:
Neodymium magnet: (Curie temperature 310℃-350℃), according to the grade, the maximum working temperature is 80~220℃;
Ferrite magnets: (Curie temperature 450℃) the maximum working temperature is 250℃;
Samarium cobalt (1:5) magnet: (Curie temperature 750℃) the maximum working temperature is 250℃;
Samarium cobalt (2:17) magnet: (Curie temperature 825℃)the maximum working temperature is 350℃;
Aluminum nickel cobalt: (Curie temperature 860℃) the maximum working temperature is 450℃;
The above five performance are high temperature resistance, if once exceeds the maximum temperature, the magnet will demagnetization!
We can wholesale customize all kinds of materials, specifications of high temperature magnet
Secondly, Let us talk about the high temperature resistant strong magnet, that is neodymium strong magnets.
1. The data ends with M. For example, the temperature resistance of N50M is generally ≤100℃
2. The data ends with H. For example, the temperature resistance of N48H is generally ≤120℃
3. The data ends with SH. For example, the temperature resistance of N45SH is generally≤150℃
4. The data ends with UH. For example, the temperature resistance of N35UH is generally ≤180℃
5. The data ends with EH. For example, the temperature resistance of N38EH is generally ≤200℃
6, The data ends with AH, for example: the temperature resistance of N35AH is generally ≤220℃
By the above explain, we can see the maximum working temperature according to the grade, do not exceed the maximum temperature for a long period of time.
In fact, N35 and N38 can solve most of need about customer(like medical equipment, health care products, electronic products, package product and so on.) The beginning of our standard material is N35, we do not product some magnets has a performance is lower than N35, because of the worse stability.
N40 or above relatively have good performance, of course, the price is also more expensive, generally used for mobile phones, motor, precision instruments, aerospace space, cutting-edge scientific research.
Conclusion;
high temperature strong magnet does not mean that it will not demagnetize, but to see what material is specific, there are temperature limits. We suggest that the working temperature between 80 degrees -230 degrees can choose the rare earth NdFeb magnet, the working temperature between 250 degrees -350 degrees choose rare earth samarium cobalt permanent magnets.
I recommend reading the following article;
Reason Of Neodymium Magnet Demagnetization
Difference between demagnetized magnet and non-demagnetized magnet