Ferrite magnets

Ferrite magnets

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Thumb Magnets

Free Member  (2011)

[ Ningbo, ZH, China ]

Business Type:  Manufacturer

Supplier has 16 products

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Risheng Magnets

Product Description

Ferrite magnets are made of SrO or BaO and Fe2O3 by ceramic processing technology. Ferrite magnets are very hard and brittle, and require specialized machining techniques. Moreover, they should be machined in an unmagnetized state. Due to their low cost, Ferrite magnets enjoy a very wide range of applications, from motors and loudspeakers to toys and crafts, and are the most widely used permanent magnets today.

Manufacturing Process

Pressing and sintering involves pressing very fine ferrite powder in a die, and then sintering this pressed magnet. All fully dense Ferrite magnets are produced this way. Ferrite magnets can be wet pressed or dry pressed. Wet pressing yields better magnetic properties, but poorer physical tolerances. Generally, the powder is dry for grade 1 or 5 materials, and wet for grade 8 and higher materials. Sintering involves subjecting the material to high temperatures to fuse the pressed powder together, thus creating a solid material. Magnets produced through this process usually need to have some finish machining, otherwise surface finishes and tolerances are not acceptable. Some manufacturers extrude instead of press wet powder slurry and then sinter the material. This is sometimes done for arc segment shapes, where the arc cross-section is extruded in long lengths, sintered, and then cut to length.


Ferrite is brittle, and prone to chipping and cracking. Special machining techniques must be used to machine this material. We are fully equipped to machine these materials to your blueprint specifications.

Surface treatments

The corrosion resistance of Ferrite is considered excellent , and no surface treatments are required. However, Ferrite magnets may have a thin film of fine magnet powder on the surface and for clean, non-contaminated applications, some form of coating may be required.


Ferrite magnets require magnetizing fields of about 10 kOe. They can be magnetized with multiple poles on one or both pole surfaces.

Anisotropic grades are oriented in the manufacturing direction, and must be magnetized in the direction of orientation. Isotropic grades are not oriented and can be magnetized in any direction, although some degree of greater magnetic strength will be found in the pressing dimension, usually the shortest dimension.

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About Us

Thumb Magnets is belonged to Risheng Magnets, which is one of the largest magnet manufacturers in China since 1989, We have 2 automation production lines for flexible magnets with the capacities over 2000 tons annually and provide various promotion magnets over 100 million sets per year.
Thumb Magnets your best factory for flexible magnets and promotion magnets. With over 20 years experience, we are supplying all kinds of magnets to our customers all over the world. What we supply is not only products of high quality, but also most professional service. We are always ready to assist you to work out the most suitable solution at a reasonable price for you. We are consistently working hard on improving our products and service.

Our main flexible magnets are Magnetic sheet, Magnetic tape, Ferrous sheet, Magnetic paper. Upon your request, we can provide flexible magnets with different shapes with different sizes.

Our promotion magnets are versatile, including Custom Fridge magnets/Refrigetor magnets, Magnetic bookmark, Magnetic photoframe, and all other various magnets like Magnetic calender, Magnetic ruler, Magnetic phone book, Magnetic dart board, Magnetic writing board, Magnetic puzzle, Magnetic bag, Magnetic memo board etc. We are very pleased to receive your own design and idea to make your own promotion magnets.

We sincerely welcome you to come into a successful and long term relation with us. We will always listen to you and try our best to assist you to achieve your original objectives.

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