0769-23388351
Toggle Navigation
A magnet will lose some magnetism immediately when it encounters a high temperature that exceeds its own tolerance. How much high temperature does it need? This depends on the coercive force of the magnet, which is usually expressed by the letter after the magnet grade, such as N40H, the maximum magnetic energy product is 40, and H represents the temperature resistance of 120°C. The higher the coercive force, the more metal dysprosium content is added to the magnet. .
How much magnetism will it lose?
It depends on the degree of its magnetic protection, if there is some iron around it will help. Of course, it depends on the temperature. But this is a highly non-linear effect. It does not lose any magnetism until it reaches a certain temperature, and then loses all magnetism quickly. Please note that the amount of magnetism it loses depends on how high the temperature is, not the length of time at a particular temperature. After the magnet reaches a certain temperature, it will lose all the magnetism that it can reach at that temperature.
How long does it take?
For a specific small volume of magnet, demagnetization will occur immediately. However, even in a small magnet, it takes time for heat to transfer from the outer surface to the center. For example, a 1 cm3 part takes several minutes. However, the part of the magnet near the surface will immediately lose its performance. 200°, whether in Fahrenheit or Celsius, is very high for a magnet. Unless you have a special, very advanced magnet (UH or AH or better), you will completely ruin it.
Introduction to the coercivity of each grade of magnet;
Grade n neodymium magnet: low coercivity
Grade m neodymium magnet: medium coercivity
Grade H neodymium magnet: high coercivity
SH grade neodymium magnet: extra high coercivity
Uh grade neodymium magnet: ultra high coercivity
EH grade neodymium magnet: extremely high coercivity
Neodymium magnet grade parameters;
Magnetic property parameters of sintered Nd-Fe-B
High temperature resistant magnets are recommended;
This is a multi-pole magnetized bonded neodymium magnetic ring, mainly used in electric motors, the outer diameter of the ring is 25.8mm, the height is 40mm, it can be 4-pole or 8-pole magnetized, samples are available, welcome to inquire about price or other sizes....
Our common epoxy coated magnet is black epoxy, but in fact the epoxy can be many colors, such as red, green, white, you are now seeing this is a red round neodymium magnet, is the use of red epoxy coating, the material is neodymium-iron-boron, the diameter of 5mm, the thickness of 2mm...
This product is a block neodymium magnet with a length of 25 mm, a width of 10 mm and a thickness of 2 mm. It has a small tolerance and belongs to the 1-inch block permanent magnet series. It has a double-sided magnetic force, and its magnetic strength is around 1900 gauss....
This is a 5mm thick ring magnet made of sintered rare earth neodymium, the outer diameter of the ring is 62mm, the inner hole is also relatively large, 54mm, belongs to the medium size neodymium ring magnet, there is no need to customize in stock, axial magnetization, nickel plated surface, silver white,...
Product Name: Customized T-shaped NdFeB Magnet，Shape: T-shaped, convex，Size: customized，Grade: N35-N52，Tolerance: ±0.1mm，Place of Origin: Dongguan, China, Our company has great advantages for this T-shaped magnet, special-shaped neodymium magnet, especially the high-performance grade, you are welcome to come to the drawing consultation....
This product is a through hole ring magnet with diameter 10mm, thickness 5mm, hole 5mm, galvanized on the surface, magnetized in thickness direction, N35-N52 grade can be selected, the highest temperature is 80-220 degrees, and it is packed as foam + carton + magnetic separator plate + outer box. If you want to know the price, please send us an email....
This is a customized 2.5 inches powerful ring magnet, material is rare earth neodymium, the outer diameter of the ring 65mm, hole 46mm, thickness 8mm, the surface of the conventional nickel-plated treatment,...
This is a bonded neodymium magnet with an outer diameter of 44.6mm, an inner diameter of 39.8mm and a height of 6.8mm. It has 16-pole magnetization in the radial direction, 8 N poles and 8 S poles. Because it contains rare earth components, its magnetism is relatively strong, generally reaching more than 2000 gauss. These magnets are ideal for consumer electronics (digital cameras, video cameras, TV sets, DVD players, computers, servers),...