Ningbo Beilun Meank Magnetic Industry Co.,LTD.


Does rare earth magnet mean neodymium magnet?

No, magnets made of rare earth elements on the periodic table are all rare earth magnets. Samarium cobalt magnet is also common rare earth magnet. But neodymium magnet is the most commonly used rare earth magnet and the strongest rare earth magnet in the world.

What do the grade of N35, N40, n42, N45, N48, N50 and n52 of neodymium magnets mean?

According to the magnetic energy product, neodymium magnets are divided into different grades, which are expressed by these data of N35, N40, N42, N45, N48, N50, N52. The higher the value, the higher the strength grade of the neodymium magnet, but the higher the grade, the more brittle the neodymium magnet becomes.

Can I cut, drill or otherwise process the neodymium magnet by myself?

No, the processing of neodymium magnets requires professional technology and tools. Neodymium magnets are very hard and fragile. Any non professional processing may damage the magnets.

Can neodymium magnets be welded?

No, it can't. The neodymium magnet is not suitable for welding. High temperature will demagnetize the magnet.

Do I pay attention to the temperature of the environment where neodymium magnets are used?

Yes, Neodymium magnets are very sensitive to temperature. Different grades of neodymium magnets have specific upper temperature limits. Generally, the upper working temperature limit of N-brand neodymium magnet is 80 ˚ C。

How long does nickel plated neodymium magnet last when used in salt water?

Salt water is not suitable for NdFeB magnets and cannot be used in salt water environment because the nickel coating will corrode rapidly (24-48 hours).Epoxy coated neodymium is recommended if longer time is needed.

Does a neodymium magnet lose the magnetic force over time?

Very seldom. Neodymium magnet is the most permanent magnet in the world, and the magnetic force can be maintained permanently. As long as you keep it properly, you can't feel the weakening of the magnet.

Do neodymium magnets pose health and safety risks?

There are no known health risks from exposure to a neodymium magnets.If not handled properly, the big and strong neodymium magnets may cause physical injury.

Can neodymium magnets damage electronics?

Some magnetic media, such as credit cards, magnetic ID cards, magnetic cassettes and video tapes can be damaged by strong neodymium magnets, the strong magnetic filed can also damage TVs, computer monitors and other CRT monitors.

Will two superimposed magnets make them stronger?

Yes, when two or more magnets are stacked together, they will become stronger, but due to the nature of the material, they will not always become stronger in proportion.

Can you offer custom permanent magnets?

Yes, we can offer all kinds of custom permanent magnets, including neodymium,smco,ferrite and alnico magnets.

What kind of materials can be attracted by a permanent magnet?

Any kind of ferromagnetic material will be attracted by a permanent magnets. Objects made of iron, nickel or cobalt are the most common metals that attract magnets.

Can the magnet with 20kgs pull force lift a 20kgs object?

The magnetic pulling force of magnet is measured under ideal conditions, so it can not reach the same strength in practical application.

Why are coatings needed for neodymium magnets?

Neodymium magnets are made of neodymium, iron and boron. The iron from the neodymium magnet will oxidize quickly and will rust over time, the coating protects the neodymium magnet from rusting.

What are the main advantages and disadvantages of NdFeB magnets?

NdFeB magnet has the advantages of high cost performance and good mechanical properties; The disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to be powdered and corroded. It must be improved by adjusting its chemical composition and adopting surface treatment methods in order to meet the requirements of practical application.

What is the strongest magnet in the world?

The strongest magnet in the world is rare earth neodymium magnet, while the strongest magnet in the environment above 200 ℃ is samarium cobalt magnet.

How long can the magnetic properties of rare earth neodymium magnets be kept?

The magnetic properties of rare earth neodymium magnets can be kept permanently without a strong external magnetic field, appropriate temperature and humidity and vibration.

What factors can affect the processing cost of magnets?

Shape, tolerance and quantity are the main factors affecting the price of magnets. The tighter the tolerance, the higher the processing cost. The smaller the quantity, the higher the processing cost. The more complex the shape of the magnet, the higher the processing cost.

Can you provide waterproof magnets?

Yes, we are a professional manufacturer of waterproof magnets. We have all kinds of waterproof magnets for sale,which including plastic coated magnets, rubber coated magnets and Teflon coated magnets.

Do samarium cobalt magnets need electroplating?

Compared with NdFeB magnets, samarium cobalt magnets have relatively low iron content, so samarium cobalt magnets are not easy to corrode. If samarium cobalt magnets are put into seawater, some rust will be generated on the surface, but it will not affect the use. Therefore, samarium cobalt magnets usually do not need electroplating.

How to check the quality of neodymium magnet coating?

The coating quality directly affects the service life of neodymium magnets. The main methods to check the coating quality of neodymium magnets are as follows:

1. Appearance

The appearance is mainly observed with the naked eye, preferably under natural light (sunlight, non-direct), or under the illumination equivalent to a 40W fluorescent lamp. There shall be no blistering, peeling, local electroplating, uneven colour, stains, water stains, etc.

2. Measure the thickness of neodymium magnet coating.

3. Drop test, mainly used for galvanized neodymium magnets.

4. Cross-cutting test, mainly used for neodymium magnets with nickel coated.

5. Quenching and thermal shock test.

6. PCT pressure test.

7. SST salt spray test.

8. Constant temperature and humidity test, etc.

How to choose magnets?

Magnets are mainly selected from the following aspects:

The function of the magnet, you must know what function the magnet needs?

The shape of magnet: round magnet, rod magnet, square magnet, arc magnet and cone magnet.

Dimensions of magnet: length, width, height, diameter and tolerance.

Can neodymium magnets be used directly for magnet fishing?

Neodymium magnets can be directly used for fishing, but it is easy to break and damage due to impact. It is best to use a special fishing magnet for underwater fishing.

How to measure the strength of a magnet?

The magnetic field density on the surface of a magnet, called the surface Gauss, is measured with a Gauss meter. A tensile tester is used to test the holding force of a magnet.


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