what are one-side permanent magnets?

Are you wondering what one-side magnet is? Here to introduce the one-side magnets.

The Introduction of One-side Magnets
Permanent Magnets have two poles, but in some specific working positions a single-pole magnet is needed. So we need to encase one side of magnet by metal plates, in order to shield the magnetism of that side. And strengthen the magnetism of the other side through the refraction of metal plates. These magnets are collectively known as one-sided magnets. But actually, the real one-sided magnets don’t exist.

The Material of One-side Magnets
The material used for one-side magnets is neodymium rare earth magnets. Most of the one side magnets are disc shapes.

The Application of One-side Permanent Magnet
1、One-side magnets are widely used in presswork industry. There exist one-side magnets in gift boxes, phone boxes, tobacco and wine boxes, MP3 boxes and moon cake boxes, etc.
2、They are also widely used in leather industry, such as bags, suitcases, briefcases, traveling bags, cell-phone cases, wallets and so on.
3、In Stationery industries, one side magnets are used in notebooks, white boards, folders, and magnetic name badges.

The Purchasing Considerations of One-side Magnets.
The manufacture of one-side magnets is to artificially put the neodymium magnets into the metal plates. So it will take a pretty long time to produce. Customers who want to purchase should place the order in advance.

There are many specifications of one-side magnets. China Rare Earth Magnet limited can customize the magnets according to your requirements. Please send e-mail to us if you have any demand for magnets.

Tags: permanent magnet

What kind of permanent magnet needs a mould in production?

Someone might wonder what magnet needs a mould while others do not. China Rare Earth Magnet Limited would like to discuss about this.

Permanent magnets that our company mainly manufacture: NdFeB magnet, ferrite magnet, SmCo magnet, bonded NdFeB magnet and injection molding magnet.

Sintered NdFeB magnet, also called strong magnet, has the strongest magnetism which is also one of its advantage. NdFeB magnet can be customized as per customer’s requirement without molding.

Apart from sintered NdFeB magnet, bonded NdFeB magnet is also a kind of neodymium. Its advantage is that it can be shaped in one shot without further processing. Bonded NdFeB magnet can be made into various complex shapes while sintered NdFeB magnet can not. The application of bonded NdFeB magnet can significantly decrease the volume and weight of motor. A mould of bonded NdFeB magnet ranges in price from $450 to $900.

Ferrite permanent magnet, also called normal magnet. Its magnetism is weaker than NdFeB magnet’s and thereof its price is lower than NdFeB’s. So ferrite magnet is wildly used. Ferrite magnet is divided into two classes: molding ferrite magnet and cutting ferrite magnet. Obviously the former needs a mould during production while the later do not.


SmCo magnet is mainly used in product which works at a temperature higher than 300℃. SmCo magnet is seldom applied as its high price. Mould is not a necessary for the production of SmCo magnet.

Mould is a must for the production of injection molding permanent magnet. We have available moulds in various size and we welcome your inquiry with detailed information.


To sum up, magnets need moulds during production include injection molding magnet, bonded NdFeB magnet, irregular ferrite magnet, multi-pole magnetized ferrite magnet and large-sized NdFeB magnet.

Do you know magnets that need mould during production better after reading above content? Feel free to contact us if there is any question.

Tags: permanent magnet

What are the advantages of electromagnets? What are their main applications?

Electromagnets are not our products of permanent magnets. There are many differences between them. We have encountered with customers that need electromagnets many times.  Unfortunately, China Rare Earth Magnet Limited does not produce this kind of electromagnet. Today we are talking about the advantages and applications of electromagnets.

What are the advantages of electromagnets? 
Electromagnets have many advantages: such as its magnetism can be controlled by electricity and power outage; its magnetic strength can be controlled by the strength of the current; its north and south poles can be controlled by the direction of the transformation current.

What are the main uses of electromagnets?
Electromagnetic switch, traction electromagnet, electromagnetic crane, grinder suction cup, solenoid valve, electromagnetic brake, water level automatic alarm, automatic electrical electromagnetic system and so on.

To give you a few examples, such as the electromagnetic crane has a large electromagnet. Through the current, a few tons of heavy steel material can be sucked up to move to a designated location. There is no fixture on the Grinder Workbench in the machinery factory, but the machined work piece is sucked on top for processing. Workbench is also a large electromagnet. It can attract steel or work pieces with power. When there is no power, it can release steel or work pieces. Electromagnetic dressing machine by the role of electromagnets can separate iron and non-ferrous matter.

If there is any other question about permanent magnet, please feel free to contact us.

Tags: permanent magnet, electromagnets

How to measure the surface gauss of cylindrical permennt magnet?

Cylindrical magnet, one of the commonest permanent magnets, is normally of NdFeB or ferrite material. But somebody knows little about the magnetization and how to test the surface gauss of magnet some how. So below is information about that in more detail.

What are magnetization orientations of cylindrical permanent magnet?

There are two traditional magnetization directions, diametrically magnetized and axially magnetized. Usually, disc magnet is magnetized through axle while cylindrical magnet is diametrically magnetized. And of course the actual orientation is subject to customer’s requirement.

How do we test cylindrical magnet’s surface gauss value?

There are two favorable places for testing, both ends and flank of cylindrical magnet. And please kindly note that the testing point must be smooth. Where to measure is actually depend on the permanent magnetic material and cutting direction chosen during the production.

For most cylindrical magnets, the best testing point are the ends. Sliding the gauss meter on the magnet, you could collect data and find the max gauss value. As for diametrically magnetized magnet, please move the gauss meter along the flank of the magnet. Thus the gauss range of magnet is obtained.

Do you have a general understanding of How to measure the surface gauss of cylindrical permanent magnets now?

Tags: permanent magnet, cylindrical magnet

Do you Know How the Permanent Magnets are Used for Beneficiation?

Everybody knows that lots of mineral resources are symbiotic, that is, there are varieties of minerals mixed together inside the mined material. These substances have different magnetic properties. According to this feature, people developed professional mineral processing equipment—magnetic separators that are equipped with permanent magnets.

By taking the advantages of the differences in magnetism and magnetic strength of minerals that have different components. These components will be attracted by permanent magnets, and because of the different attraction force, we can separate the minerals with different magnetic property that are mixed together, and achieve the beneficiation by magnetism.

Beneficiation magnets are mainly ferrite magnets and neodymium magnets. One machine uses a lot of them.

What kinds of magnetic separators will use permanent magnets?

There are mainly magnetic pulleys, conveyor magnetic pulleys, strong magnetic pulleys, supper strong magnetic rollers, magnetic bars, conveyor belt permanent magnets, the salvage magnetic plates, remote iron suction plates, etc.

So that’s how the permanent magnets are used for beneficiation. If you have any demand for magnets (neodymium, ferrite) that are used for magnetic separators, please contact us—China Rare Earth Magnet Limited.

Tags: permanent magnet, magnetic separators

What are the differences between the different sizes of magnets produced by a batch of permanent magnet materials?

When we produce strong magnets, we often encounter some customer questions, that is, customers found the magnetic force of different sizes of magnets is different, even though they are produced by a batch of material. In this case, we magnet manufacturers will explain to customers, magnets, its magnetic force is mainly depended on Gauss value. This Gauss value is the one our permanent magnet manufacturers often say the magnetic unit. Usually the larger value of this Gauss value, the stronger the magnetic force, then why the different dimensions produced, its Gaussian value is not the same? Let me talk about this question today.

The composition of the powerful magnet is made of NdFeB permanent magnetic material, in the theoretical data, if we use the same material under the same condition, while the magnet thickness decreases, the Gauss value of the magnet will also decrease, and then the magnetic force becomes weaker. The magnetism will increase with the increase of the area.

Here is one key point I would like to mention. The higher the surface Gauss value of magnets indicates the greater the magnetic force per unit area! Magnetic force = unit area of surface Gauss value* per unit area. However, it can’t jump to the conclusion that the magnetic force must be large with high surface Gauss value.

Therefore, permanent magnets in the same batch of materials produced by different sizes of magnets will have a Gauss value difference, which is actually a normal phenomenon. If you still have the other relevant questions of magnets, please feel free to contact us.

Tags: permanent magnet, magnet manufacturer

Permanent Magnets Might be Used in Microsoft’s Product 20190702

The Microsoft Surface computer is one of the most remarkable products of the Windows camp and is a best seller. Microsoft has rarely found a flaw regarding the hardware side in the business. However when it comes to their Surface lineup, it seems that something is different. Because a number of people swear by the Microsoft Surface Notebooks and their experience. But a new patent recently leaked from Microsoft’s stables which indicate some differences on their future plans!

However, the iFixit disintegration experts and the countless users who have to repair the Microsoft Surface have had something to complain about. The Surface is also renowned for it’s difficult to disassemble and repair design. With the latest Microsoft Surface Pro 6, iFixit experts gave then 1 point of repairability (out of 10 points). And for Surface Laptop 2 was got 0 of repairability, which means that it is almost impossible to repair this laptop. As for the Microsoft Surface Book 2, it received a 1 point score by iFixit as only the SSD can be exchanged.

The difficulty of repair resulted from nothing but a sum of two points. One is that Microsoft’s structural design is too complicated, and the other is that Microsoft uses too much glue.

Fortunately, Microsoft may have realized this problem and might attempt to fix it. A recently leaked patent from Microsoft shows that a new assembly technology was introduced. Guess what!!
From a patent perspective, Microsoft has tried to replace glue with permanent magnet to connect and secure electronic components to the housing through one or more magnetic attachment points.

The positive influence of this patent is that it can speed up the manufacturing process. Besides, foreign publications also have an opinion that this improvement can make the repair and recycling of computer much easier.

This technology seems like a creative solution. Secure the design points of a computer by using permanent magnets might make the overall disintegration easier to process. What’s more, people don’t need complex tools or familiar with the repair of their machines.

Tags: permanent magnet