NdFeB strong magnets are generally divided into N35/N38/N40/N42/N45/N48/N50/N52 and other grades. The most obvious difference between each performance grade is the difference in magnetic performance. For example, for products of the same specification, the performance The higher the grade, the better the magnetic properties of the product. However, the NdFeB strong magnet is a surface molecule and its active product, so the surface of the NdFeB strong magnet must be electroplated, such as zinc plating, nickel plating, nickel copper nickel plating, epoxy plating, etc. Wait. Under normal circumstances, we do not carry any instruments for testing the magnetic properties of products around us at any time, so how do we judge the product performance of a NdFeB magnet? To be precise, there is no way to judge without any testing instruments— the performance of a magnet product.
Because the appearance looks the same, you can't see any results. Maybe you find several magnet suppliers, some offer 0.28, and some offer 0.1, which creates a problem. Why is the offer so cheap? Isn't that really what I want?
In actual work requirements, we often encounter the need to judge the magnetic properties of the product. If there is a gauss meter, we can make a rough judgment based on the surface magnetic field of the product. In the absence of an instrument, we need to use the unique magnetic field of the product itself. Magnetic conditions to judge,
First, use magnets to attract or repel each other, so that we can judge the magnetic pole of the magnet product, at least the magnetic pole that can judge the same direction. Second, you can feel the magnetic strength of the magnet product by moving the two magnets that attract each other by the hand.
Third, use a magnet to separate a wooden board to attract an iron object, and then let the magnet slowly leave the wooden board. After seeing how far away, the iron object falls from the wooden board. The larger the distance, the stronger the magnetism.
Fourth, if the company allows it, it is best to buy a magnetic detection device, such as a Gauss meter or a flux meter, to facilitate inspection.
