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   Useful tools to calculate magnetic surface flux and pull force.
MAGPANDA Inc.
Hot-line: 086-0574-87053588
E-mail: sales@magpanda.com
 
 
Location: Home > FAQ
·FAQ

  Frequently Asked Questions:

   

1.     When I purchase from your site, is my credit card information/order secure?

Absolutely. We currently have a 128-bit SSL (Secure socket layer) security encryption that keeps your information completely safe.

2. I don't want to put my credit card info online. Is there some other way I can pay?

We take every measure possible to ensure that your online transaction with us is secure. If you would still prefer not to order online, there are many other ways to place an order with us. Please can contact our sales directly at sales@magpanda.com.

3. Is your site intended for business use, or can anyone purchase from your site?

We are especially interested in purchases from the average consumer. One of the reasons we set up this site was to sell outside of the business scope to a smaller scale. Naturally of course, we are still interested in a company's business and sell discount in bulk.

4. How can I find out when my order has been placed/shipped?

Upon placing your order, you will receive a confirmation email informing you we have received your order. If there are any problems with your order, you will be notified within a 24 hour period.

We will send another email to inform you that we have shipped the goods and you will know the shipping detail by put the tracking number we offered

5. I have a question about one of your magnets, who can I contact?

We have sales personnel available daily for any inquiries you may have. They can be contacted by online contact, or emailing sales@magpanda.com or calling 0086-574-8705-3588.

6. Which is the strongest type of magnet?

The most powerful magnets available today are the rare earths types. Of the rare earths, NdFeB types is the strongest. However, at elevated temperatures, the SmCo types can be stronger than the NdFeB types.

7. What are neodymium magnets made from and how are they made?

Neodymium magnets are actually composed of neodymium, iron and boron (they are also referred to as NdFeB magnets). 

The process flow of Neodymium magnets is as follows:

Raw material – Burdening – Melting – Crushing – Milling – Pressing – Sintering – Machining – Plating / Coating – Inspection – Magnetizing – Packing.

8. How can I identify the poles of the magnets?

There are several simple methods that can be used to identify the (Scientific) North and South poles of neodymium magnets.
1)  The easiest way is to use magnetic pole finder. Blue point at N pole, and Red point at S pole.

2)  If you have a compass handy, the end of the needle that normally points North will be attracted to the South pole of the neodymium magnet. 
3)  If you take an even number of magnets and pinch a string in the middle of the stack and dangle the magnets so they can freely rotate on the string, the North pole of the magnets will eventually settle pointing North. This actually contradicts the "opposites attract" rule of magnetism, but the naming convention of the poles is a carry over from the old days when the poles were called the "North-seeking" and "South-seeking" poles.  These were shortened over time to the "North" and "South" poles that we know them as.


9. Where are the North and South poles on these magnets?

10. What materials do magnets attract?

Ferromagnetic materials are strongly attracted by a magnetic force.  The elements iron (Fe), nickel (Ni), and cobalt (Co) are the most commonly available elements. Steel is ferromagnetic because it is an alloy of iron and other metals.

11. How do you measure the strength or power of a magnet?

1): To manufacturers, the most important tool for testing magnetic properties is  Automatic Hysteresigraph.

Apart from it, we use Gaussmeters to measure the magnetic density flux.

To magnetic holding systems, we use Pull-Testers to measure the magnetic force!

 

 

 

 

 



 

12. Can I solder or weld to neodymium magnets?

You definitely cannot solder or weld to neodymium magnets. The heat will demagnetize the magnet and could cause it to catch fire posing a safety risk. 

13. Do I have to worry about temperature with neodymium magnets?

Yes.  Neodymium Iron Boron magnets are sensitive to heat.  If a magnet heated above its maximum operating temperature (176F (80°) for standard N grades) the magnet will permanently lose a fraction of its magnetic strength.  Different grades of neodymium different maximum operating and Curie temperatures. 

14. Will my neodymium magnets lose strength over time?

Very little. Neodymium magnets are the strongest and most permanent magnets known to man. If they are not overheated or physically damaged, neodymium magnets will lose less than 1% of their strength over 10 years - not enough for you to notice unless you have very sensitive measuring equipment. They won't even lose their strength if they are held in repelling or attracting positions with other magnets over long periods of time.

15. Will neodymium magnets lose strength if they are held in repelling or attracting positions for a long time?

In most applications, the answer is simply "no". If the magnets will be exposed to higher temperatures while in repelling applications, the answer is "possibly".

16. Can I make a magnet that I already have any stronger?

No, once a magnet is fully magnetized (saturated), it cannot be made any stronger.

17. What is the difference between the maximum operating temperature and the Curie temperature of the magnets?

The maximum operating temperature is the maximum temperature the magnet may be continuously subjected to with no significant loss of magnetic strength. This is 176F (80°) for standard grades of neodymium magnets. The Curie Temperature is the temperature at which the magnet will become completely demagnetized. This is 590F (310°) for standard grades of neodymium magnets. Higher temperature grades have higher maximum operating temperatures and higher Curie Temperatures. At temperatures between these two points, a magnet will permanently lose a portion of its magnetic strength. The loss will be greater the closer to the Curie Temperature it is heated.

18. How strong of a magnetic field is necessary to magnetize a neodymium magnet?

As a general rule of thumb, a peak field of between 2 and 2.5 times the intrinsic coercivity is required to fully saturate a magnet. For standard neodymium magnets, the field required is minimum of 24 KOe, but 30 KOe is usually the minimum used.

19. How do I separate large magnets?

Small and medium-sized magnets can usually be separated by hand by sliding the end magnet off of the stack. 

Medium-large magnets can often be separated by using the edge of a table or countertop. Place the magnets a table top with one of the magnets hanging over the edge. Then, using your body weight, hold the magnet(s) on the table and push down on the magnet hanging over the edge. With a little work and practice, you should be able to slide the magnets apart. Just be careful that they don't snap back together once they become separated. 

For very large magnets (generally 2" and larger), we use a specially made magnet separating tool.

20. I have metal dust all over my magnets. How can I remove it?

Using adhesive tape to capture the metal dust is the best way to clean magnets.

21. Why are most neodymium magnets plated or coated?

Neodymium magnets are composed mainly of Neodymium, Iron, and Boron. If neodymium magnets are not plated, the iron in the material will oxidize very easily if exposed to moisture. Even normal humidity will rust the iron over time. To protect the iron from exposure to moisture, most neodymium magnets are plated or coated.

22. What is the difference between the different platings and coatings?

The coatings do not affect the magnetic strength or performance of the magnet.  The preferred coating is dictated by preference or by the magnets intended application. 

Nickel is the most common choice for plating neodymium magnets, and is actually a triple plating of nickel-copper-nickel.  It has a shiny silver finish and has good resistance to corrosion. 

Black nickel has a shiny, black/charcoal appearance and is slightly more corrosion resistant than regular nickel.  It is also a triple plating of nickel-copper-black nickel. 

Zinc has a dull gray/bluish finish, that is more susceptible to corrosion than nickel.  Zinc can leave a black residue on hands and other items. 

Epoxy is basically a plastic coating that is virtually 100% corrosion resistant as long as the coating is intact.  From our experience, it is the least durable of the common coatings. 

Gold plating is applied over the top of nickel plating, so gold plated magnets have the same characteristics as nickel plated ones, but with a gold finish.

23. Can I paint over the nickel plating?

Yes, you can use any paint formulated for use on metal surfaces. Spray-on paint seems to work best.

24. I noticed that the plastic- and rubber-coated magnets have a lower pull force than nickel-plated magnets of the same size. Does the plastic/rubber weaken the magnet?

These materials don't "weaken" the magnet, but the volume of magnet material is reduced to allow room for the coatings, which reduces the pull force. The layer of plastic or rubber also creates distance between the magnet and metal surface which also reduces the pull force.

25. I need a special size/shape of neodymium magnet. Can you supply custom magnets?

Yes, we can supply custom magnets. You can contact us at sales@magpanda.com.

26. Will magnets harm my electronics?

Maybe...The strong magnetic fields of these magnets can damage certain magnetic media such as floppy disks, credit cards, magnetic I.D. cards, cassette tapes, video tapes or other such devices.  They can also damage televisions, VCRs, computer monitors and other CRT displays. Never place neodymium magnets near any of these appliances.  As for other electronics such as cell phones, iPods, flash drives, calculators and similar devices that do not contain magnetic storage media, probably not, but it is best to err on the safe side and try to avoid close contact between neo magnets and electronics.

27. How far away from electronics should I keep my magnets?

This depends on a lot of factors, but as a general rule of thumb, we recommend keeping the distance between magnets and electronics 4" + 1" for every 10 lbs of pull force.

28. Can a magnet that has lost its magnetism be re-magnetized?

Provided that the material has not been damaged by extreme heat, the magnet can be re-magnetized back to its original strength.

29. Can I get the quantity discount pricing for an odd quantity of magnets (i.e. quantity of 11)?

Yes. If you are ordering an odd quantity of a particular magnet, you can get the quantity pricing by simply adding a single magnet to your shopping cart. Then, while viewing the shopping cart, change the quantity from "1" to your desired quantity and click "Update Totals". The shopping cart will recalculate the price and total and will give you the quantity discounted price.

 

 

 

 
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