China Neodymium And Ferrite Magnets Manufacturer & Supplier 
I only have samples of neodymium magnets. Can you help me determine if they are resistant to high temperatures? What is the performance grade? I can provide samples. This is a question raised by a customer. Let's start introducing it below.
The easiest way is to check the product label or ask the original magnet supplier for the “magnet grade”, such as the label paper marked with N35M, followed by the M represents the limiting temperature is 100 ℃, if it is SH, it represents the limiting temperature is 150 ℃.
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Special shape neodymium magnet with hole
In addition, it can also be roughly judged by heating test. For example, by heating (before and after heating with a gaussmeter to measure the magnetic flux density of its surface), detecting the magnetic change, if the decline is within 5%, it means that the temperature resistance is good. If the decline is more (e.g. more than 15-20%), it means that the magnet's performance is not stable at that temperature.
Professional instruments such as pulse magnetic field magnetometers can also be used to detect Hcj values. The Hcj of ordinary neodymium iron boron is usually below 20 kOe, while the Hcj of high-temperature resistant models (such as the H series) can reach 20-25 kOe, and the UH series can even exceed 30 kOe.
We can also judge roughly according to the customer's usage, such as where the magnet is used? Is it operated in high temperature environment (e.g. above 150℃) for a long time? We can recommend the grade of neodymium magnet.
These are a few ways about determining whether the magnet is high temperature resistant, the simplest is to consult with the supplier or check the product label, which is usually indicated. If not, you can conduct a step-by-step temperature rise test on the magnet, such as 80℃, 100℃, 120℃, 150℃, 180℃, according to the degree of flux attenuation to determine its temperature resistance limit.
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