Magnetism

The "magnetism" is a subject that fascinates many people. We are manufacturers and importers of magnetic and electromagnetic equipment and permanent magnets. Our activities focus on the industry, but also act upon resale. But many of the requests we receive on our site are students seeking information on this vast subject.
Thus, in order to help the diverse audience of visitors and customers, we decided to create this additional page on our site. Below, we summarize some of the most frequently asked questions regarding magnets, magnetics, magnetic devices, etc..
Finally, it is worth mentioning that the text below does not keep a physical rigor determined, instead, seek to simplify it to make it more didactic.


FAQs about Magnets


1. How can I identify the poles of a magnet?

There are several simple methods that can be used to identify the north and south poles of a magnet:

 

a. The simplest method is obviously the use of a second magnet that already has a marked pole. The north pole of the magnet will be attracted marked by the south pole of another magnet.

 

b. Take an even number of magnets and enter a string in the middle of them leaving them hanging so they can rotate freely. The north pole of the magnet will eventually be positioned towards the north. This "magnetic behavior" actually contradicts the theory that opposite poles attract (or the same poles repel each other), but this explains why the denomination of the polarities of a magnet (north / south) comes from the old days when the poles were called "north-seeking" and "south-seeking" (Polo seeking the south Pole was the north pole and vice-versa). These names have been abbreviated over time for "north" and "south" poles today are known as / called.

 

c. If you have a portable compass, the needle end pointing north will be attracted to the south pole of the magnet.

 

d. The simplest and most effective method is to use a device identifier magnetic polarity. There are several models, from the simple to the sophisticated Gauss Meters (or Gausimetros) that not only identify and measure the polarity magnetic flux.

 


 

Identifier Polarity ITAL


2. A pole is stronger than the other?

No, both poles of a given permanent magnet, has the same "force" or magnetic field.



3. Which is the strongest type of magnet?


Neodymium magnets, but precisely the Neodymium-Iron-Boron magnets are the strongest there is. Within each permanent magnet there are different degrees, or from the Neodímios there is a growing table of forces.


4. Which is to say that a magnet is "magnetized through the thickness"?


We use the "magnetized through the thickness" description to identify the location of the poles of magnets. The thickness is always the last measure when defining measures of a given permanent magnet. For example, if a block magnet is described as being 50x50x25mm means that the thickness is 25mm and the pole surfaces are 50x50mm. See the pictures below that show the 3 most common types of magnets: drums, blocks and rings.

 
Disks and Cylinders

 

Cylindrical magnets and magnetized disks can be axially or diametrically:
 

 

 

Axial magnetization

magnetization Diametral

blocks


Magnets in block format are defined by three dimensions: length, width and thickness (or height). To be consistent thickness defined by the axis of magnetization. Typically the thickness is smaller, but not always!
Often customers require magnetized blocks along the length or width, which can be done. Even in these cases, when the magnetization takes the longest measurement (length) or even the width of the magnet, we define this measure as the "thickness", in order to maintain consistency of nomenclature normally used. See the figures below.
 

 

 

Magnetization through the "thickness"

 

Rings


The magnets in the ring shape may be magnetized through the thickness (axial magnetization *) or by the diameter (diametral magnetization)
Axially magnetized

 

magnetized Diametrically

 

5. Which materials are attracted by magnets?

 

Ferromagnetic materials are strongly attracted by the magnetic force of a magnet, or even of an electromagnet. The steel is ferromagnetic because your league is iron and other materials.

 

6. What material can be used to block magnetic fields?

Magnetic fields can not be blocked, only redirected! The only materials capable of redirecting magnetic fields are ferromagnetic, such as iron, steel, cobalt and nickel. The "degree of redirection" is proportional to the permeability of the material. The most effective "magnetic shield" is the Nickel 80, Nickel followed by 50.

 

7. Magnets exist with one magnetic pole (mono-pole)?

No, magnets with only one pole does not exist! All magnets have at least 2 poles.

 

8. Magnets exist with an external and an internal hub?

Discs, cylinders and spheres, no. Yes and this case rings are radially magnetized.

9. Stacked Magnets are stronger?

Yes, two or more magnets stacked together behave exactly as if they were a single magnet with the combined dimensions. Example: if we stack two discs of 10 mm diameter and 3 mm thick the resulting "magnet" will have the same magnetic characteristics as a disc 10mm in diameter and 6mm thick.

 

10. How do you measure the strength of a permanent magnet?

The measuring magnetic field (Gauss or Meters) are used to measure the magnetic field density on the surface of a magnet. This is defined as the surface magnetic field and is measured in gauss (or Tesla). The ITAL markets Gauss Meters that measure up to 40,000 Gauss. Alternatively one can measure the magnetic force of a magnet through specific devices. In this case the measurement can be achieved in kilograms or grams.

 

Gauss Meter ITAL


11. How is determined the magnetic force of attraction of a magnet?

 

The strength of a magnet is usually measured in 3 ways. Case 1 measures the maximum magnetic attractive force generated between a magnet and a surface of thick steel and polished. Case 2 measures the maximum magnetic force of attraction between a magnet inserted between 2 plates of thick, polished and flat steel. In the cas

e 3 measuring the maximum magnetic force of attraction between two magnets of the same type. 

12. A "magnet with 10kg of force" lifting a 10kg object?

Because the tests of magnetic attraction are made in the laboratory and under ideal and controlled conditions (surface finish, angle of pull, etc.) the practical result with the actual conditions, will be lower. The net result is reduced by any number of factors, such as imperfect contact between the magnet and the surface (or another magnet), drift through steering not 100% perpendicular, thickness of material smaller than ideal, possibly coated surfaces and other factors. The magnetic force effectively felt by the number attracted by the magnetic field of the magnet varies greatly depending on these factors.  

 

13. Which is the "shape" of the magnetic field?

 

The most familiar to visualize the shape of a magnetic field is by way of an approaching permanent magnet of a surface covered with iron powder. The image below illustrates the issue clearly.

14. The Neodymium magnets are? Neodymium magnets are the same as the rare earth magnets?

Neodymium magnets are family members of Rare Earth magnets. Are generically called Rare Earth magnets because the Neodymium is a member of the Rare Earth elements from the periodic table. Neodymium magnets are the strongest magnets from the Rare Earth magnets and existing strongest magnets in the world.

 

15. Which are made of Neodymium magnets and how they are made?

 

Neodymium magnets are made of neodymium (Nd), Iron (Fe) and boron (B) and is therefore also called simply NdFeB.

 

NdFeB magnets are produced by compacting the powdered metal alloys and are then sintered under the action of a strong magnetic field, which guides the internal grains. Possess the best properties of all the magnets and an amazing magética / weight ratio induction. Although resistance to lower temperature of SmCo (Samarium-Cobalt), the cost is very competitive.

 

Neodymium magnets are highly susceptible to corrosion and should almost always have coating. Are usually nickel plated, galvanized or coated w / epoxy resin.

 

General Characteristics of Neodymium Magnets

 

Br (remanence): 10,400 Gauss to 14,600 Gauss

HCB (normal coercivity): 9,800 to 12,200 Oersted Oersted

HCJ (intrinsic coercivity): 11,000 to 30,000 Oersted Oersted

BHmax (max. energy prod.): 26 to 51 MGOe MGOe

 

Max working temperature: 180 ° C (depending on grade).

 

Examples of applications: speakers, magnetic separators, magnetic lifters, magnetic plates, eletropermanentes, magnetic drums, Eddy-Current separators, gifts, electronics.

 

16. Which means the grade of a particular Neodymium magnet?

 

The degree of a magnet refers to the Maximum Energy Product of the magnetic material that is made magnet. Refers to the maximum "magnetic force" that can be achieved or "magnetize" magnet. The degree of Neodymium magnets is usually measured in units of million Gauss Oersted (MGOe). A magnet school is 42 Maximum Energy Product of 42 MGOe. Summarizing general, the higher the degree way of a magnet, the stronger it will be.
The table below shows the various degrees of Neodymium magnets exist.

The table below shows the approximate strength and the number of Gauss measured on the surface of various kinds of Neodymium magnets.
 

 

 

GRADES REMANENCE COERCIVITY MAXIMUM ENERGY PRODUCT
AVERAGE TEMPERATURE COEFFICIENTS (20~ 10ºc) SUGESTED MAXIMUM OPERATING TEMPERATURE
Br HcB HcJ bhMAX Tk B/H> 0,7
KG T kOe kA/m kOe kA/m MGOe KJ/m2 %/ºC (Br) %/ºC (HcJ) ºC
REN 35 11,8-12,5 1,8-1,25 ≥ 10,8 ≥ 860 ≥ 12 ≥ 955 33-38 263-302 -0,12 -0,70 80ºC
REN 38 12,3-13,0 1,23-1,30 ≥ 10,8 ≥ 860 ≥ 12 ≥ 955 36-41 286-326 -0,12 -0,70
REN 42 13,0-13,5 1,30-1,35 ≥ 10,8 ≥ 860 ≥ 12 ≥ 955 40-44 318-350 -0,12 -0,70
REN 45 13,2-13,8 1,32-1,38 ≥ 10,8 ≥ 860 ≥ 12 ≥ 955 42-46 334-366 -0,12 -0,70
REN 50 13,9-14,6 1,39-1,46 ≥ 10,5 ≥ 836 ≥ 11 ≥ 875 47-51 374-406 -0,12 -0,70
REN 52 14,2-14,8 1,42-1,48 ≥ 10,5 ≥ 836 ≥ 11 ≥ 875 49-53 390-422 -0,12 -0,70
REN 35M 11,8-12,5 1,18-1,25 ≥ 11,0 ≥ 876 ≥ 14 ≥ 1114 33-38 263-302 -0,12 -0,70 100ºC
REN 50M 13,9-14,6 1,39,1,46 ≥ 12,5 ≥ 995 ≥ 13 ≥ 1035 47-52 374-414 -0,12 -0,70
REN 35H 11,8-12,5 1,18-1,25 ≥ 11,0 ≥ 876 ≥ 17 ≥ 1353 33-38 263-302 -0,12 -0,70 120ºC
REN 42H 12,8-13,4 1,28-1,34 ≥ 12,0 ≥ 955 ≥ 16 ≥ 1273 39-43 310-342 -0,12 -0,70
REN 46H 13,4-14,0 1,34-1,40 ≥ 12,5 ≥ 995 ≥ 16 ≥ 1273 43-48 342-383 -0,12 -0,70
REN 48H 13,6-14,2 1,36-1,42 ≥ 12,7 ≥ 1011 ≥ 16 ≥ 1273 45-50 358-398 -0,12 -0,70
REN 30SH 10,9-12,2 1,09-1,22 ≥ 10,2 ≥ 812 ≥ 20 ≥ 1592 28-36 223-287 -0,11 -0,65 140ºC
REN 33SH 11,4-12,2 1,14-1,22 ≥ 10,7 ≥ 851 ≥ 20 ≥ 1592 31-36 247-287 -0,11 -0,65
REN 35SH 11,8-12,5 1,18-1,25 ≥ 11,1 ≥ 883 ≥ 20 ≥ 1592 33-38 263-302 -0,11 -0,65
REN 38SH 13,3-13,0 1,33-1,30 ≥ 11,6 ≥ 923 ≥ 20 ≥ 1592 36-41 287-326 -0,11 -0,65
REN 42SH 12,8-13,4 1,28-1,34 ≥ 12,0 ≥ 955 ≥ 19 ≥ 1512 39-44 310-350 -0,11 -0,65
REN 46SH 13,2-13,8 1,32-1,38 ≥ 12,4 ≥ 987 ≥ 19 ≥ 1512 42-47 334-374 -0,11 -0,65
REN 28UH 10,4-11,3 1,04-1,13 ≥ 9,8 ≥ 780 ≥ 25 ≥ 1990 26-31 207-247 -0,11 -0,60 160ºC
REN 33UH 11,4-12,2 1,14-1,22 ≥ 10,8 ≥ 859 ≥ 25 ≥ 1990 31-36 247-287 -0,11 -0,60
REN 35UH 11,8-12,5 1,18-1,25 ≥ 11,2 ≥ 891 ≥ 25 ≥ 1990 33-38 263-302

-0,11

-0,60
REN 38UH 12,2-12,8 1,22-1,28 ≥ 11,6 ≥ 923 ≥ 25 ≥ 1990 36-41 287-326 -0,11 -0,60
REN 40UH 12,6-13,2 1,26-1,32 ≥ 12,0 ≥ 955 ≥ 25 ≥ 1990 38-42 302-334 -0,11 -0,60
REN 42UH 12,8-13,4 1,28-1,34 ≥ 12,2 ≥ 971 ≥ 25 ≥ 1990 39-44 310-350 -0,11 -0,65
REN 30EH 10,9-11,7 1,07-1,17 ≥ 10,3 ≥ 820 ≥ 30 ≥ 2388 28-33 223-263 -0,11 -0,55 180ºC
REN 33EH 11,4-12,0 1,14-1,20 ≥ 10,8 ≥ 859 ≥ 30 ≥ 2388 31-36 247-287 -0,11 -0,55
REN 35EH 11,7-12,3 1,17-1,23 ≥ 11,1 ≥ 883 ≥ 30 ≥ 2388 33-37 263-295 -0,11 -0,55
REN 30EHS 10,9-11,7 1,09-1,17 ≥ 10,3 ≥ 820 ≥ 35 ≥ 2786 28-33 223-263 -0,10 -0,50 200ºC
REN 33EHS 11,3-12,0 1,13-1,20 ≥ 10,7 ≥ 852 ≥ 35 ≥ 2786 31-36 247-287 -0,10 -0,50

 

17. The Neodymium magnets can be cut, drilled or machined?

The alloy of Neodymium-Iron-Boron is very hard and brittle. Thus, the machining is very complicated and difficult. RC46 The material hardness on the Rockwell "C" scale is greater than the tools and drill bits sold so that if we use in machining of neodymium, they will heat and damage. Diamond tools, abrasives and electro erosion machines are the preferred tools to shape Neodymium. Machining Neodymium magnets can only be practiced by experienced operators who are familiar with the risks involved. The heat generated during the "thinning" can demagnetize the magnet and even causing a fire. The produced during machining magnets Neodymium dust is also flammable and great care must be taken to prevent combustion of the material.

 

18. Neodymium Magnets can be welded?

Definitely can not weld Neodymium magnets! The heat generated demagnetize the magnets and can cause a fire.

 

19. The Neodymium magnets are sensitive to temperature?

 

Yes, magnets Neodymium-Iron-Boron are very sensitive to heat! If a magnet Neodymium is heated above its maximum operating temperature (80 ° C (or 176 ° F) for standard magnets) it will lose permanently or irreversibly a part of its "magnetic force". If a magnet is heated above its Curie temperature (310 ° C (or 590 ° F) for standard magnets), they will lose all their magnetic properties. Different grades of Neodymium magnets have different operating temperatures and different Curie temperatures. See table above.



20. Which is the true value of a Gauss magnet?

 

Depends on the context in which it is being used. For example, people who work with magneto therapy prefer to present as many as possible, so they often use the "density

Residual Flow "(Brmax) of material that actually does not say much about the magnet in question! This value is "essentially" the magnetic flux density within the magnetic material (magnets). Since you'll never be inside the magnet or never use the internal field of the magnet, this value does not really have any practical value. The magnetic field measured at the surface is the most accurate measure for the specification of a magnet. The field measured at the surface is exactly what he means: it is the magnetic field density on the surface of the magnet, as measured with a Gauss meter.

 

The table below shows the approximate strength and the number of Gauss measured on the surface of various kinds of Neodymium magnets.

Neodymium Magnetic disks  x Magnetic Field Strength
 

 

Grade Magnet

Bore Magnet

Height of magnet

Approximate Magnetic Field in the center of the magnet

Approximate strength of Attraction Magnet

-

mm

mm

Gauss

Kg

N35

5

1,5

3.100

1

N42

5

1,5

3.400

1,2

N35

12

2

2.000

1,4

N35

22

10

4.200

14

N35

60

10

2.000

38

 

Blocks Neodymium x Magnetic Force x Magnetic Field

 

Grade Magnet

Length of the magnet

Width Magnet

Height of magnet

Approximate Magnetic Field in the center of the magnet

Approximate strength of Attraction Magnet

-

mm

mm

mm

Gauss

Kg

N35

20

4

2

3.100

1,1

N35

40

20

10

3.500

21

N35

50

50

12,7

2.600

50

N35

50

50

25

4.200

103

 

Neodymium Magnetic Rings x x Magnetic Field Strength

 

Grade Magnet

External diameter of the magnet

Internal diameter of the magnet

Height of magnet

Approximate strength of Attraction Magnet

-

mm

mm

mm

Kg

N35

12

6

2

1,3

N35

15

4

3

2,9

N35

72

42

15

61


21. The Neodymium magnets lose their strength over time?

Very little or nothing in practice. Neodymium magnets are the strongest and "more permanent" magnets that exist. If they are not physically damaged, neodymium magnets lose at most 1% of its strength within 10 years. That is, the loss of magnetic force of a magnet Neodymium is inconspicuous, unless it can measure the effect by use of a Gauss meter with high sensitivity. The magnets will not lose their magnetic strength or ability, even if they are acting in repulsion or attraction with other magnets for long periods of time position. Eventually Neodymium magnets are exposed to high temperatures in repelling applications, some loss of its magnetic power could occur.

 

22. Where are used Neodymium magnets?

Neodymium magnets are used in many applications that you can not imagine.

The ITAL manufactures various magnetic devices that use Neodymium magnets. Among them are:

Magnetic Grids for separation of ferrous impurities of sugar, coffee, sand, salt, chocolate, etc..
Suspended Magnetic Separators for ceramics, recycling, mining, sugar cane, cement, grain, scrap, etc.
Lifting Magnets Manuals for transport blocks, molds, sheets, pieces of steel, etc.
Lifting Eletropermanentes for transporting plates, billets, steel coils, etc.
Magnetic Signs for fixing parts drills, CNCs, milling machines, lathes, etc.
eletropermanentes plates for the same application;
Other magnetic fastening devices. See more details on this site.

 

23. The Neodymium magnets meet RoHS standards ("Restrictions on the use of Hazardous Substances")?

Yes, Neodymium magnets are 100% RoHS compliant, meeting the standards of the European Parliament called (RoHS). This Directive bans the use of the following elements in electrical and electronic equipment sold after 07/01/206: Cadmium (Cd), lead (Pb), Mercury (Hg), Hexavalent Chromium Cr (VI)), PBBs and PBDEs.

 

24. One can increase the strength of a particular magnet?

No, once the magnet is fully magnetized (or magnetically saturated), it can not become stronger than it already is.

 

25. Need a magnet the size of a coin? Which currency?

Below is the size of the coins Real (R $) and whose magnets can be manufactured in the corresponding measures:
 

 

currency

diameter

weight

height

Force of Attraction Approximate N35 Neodymium magnet of equivalent size

-

mm

mm

mm

Kg

1 penny

17,00

2,43

1,65

1,9

5 cents

22,00

4,10

1,65

2,3

10 cents

20,00

4,80

2,23

2,8

25 cents

25,00

7,55

2,25

3,8

50 cents (1998 a 2001)

23,00

9,25

2,85

4,3

50 cents (2002 onwards)

23,00

6,80

2,85

4,3

1 Real (1998 a 2001)

27,00

7,84

1,95

3,5

1 Real (2002 onwards)

27,00

7,00

1,95

3,5

 

26. Which is the difference between the maximum operating temperature and the Curie temperature of a magnet?

The maximum operating temperature of a permanent magnet is the maximum temperature at which the magnet can be subjected continuously without incurring significant losses in their magnetic properties. Ie 80 º C (176 º F) for standard grades of Neodímios. The Curie temperature is the temperature at which the permanent magnet gets demagnetized, 310 ° C (590 ° F) degrees for standard Neodímios. The degree of high temperature have higher maximum operating temperatures as well as higher Curie temperatures. At temperatures between these two points, the magnet permanently lose a portion or part of their magnetic characteristics. The higher the temperature to which the magnet is subjected to higher core loss.

 

27. How strong magnetic field is required to magnetize a neodymium magnet?

As a general rule a peak magnetic field of about 2 to 2.5 times the intrinsic coercivity are required for saturation of neodymium magnet. For standard Neodymium magnets, the minimum required magnetic field is 24 kOe, 30 kOe but is usually the least used.

 

28. How to separate 2 large magnets?

The small and medium Neodymium magnets can usually be separated into their own hands, sliding a magnet against the other. Slightly larger magnets can be separated from one another, always slipping them on their surfaces, with the support of a wooden or material other than steel. Important to note that once separated, the magnets tend to attract her back, causing accidents that may hurt your hands. The magnets sometimes attract with such force that strongly shocked, chipping and dropping pieces. Ie handling Neodymium magnets from a certain size should be done very, very carefully. The magnetic field is invisible and accidents happen by accident. For very large magnets (eg 50x50x25mm), special tools must be used.

 

29. Removing that layer of iron powder which usually tends to accumulate on the surface of the magnets (Neodymium magnets in particular)?

The easiest way to remove ferrous particles retained on the surface of the magnet way is to use duct tape.

 

30. Is there any specific standard for the transport of magnets?

The American standard (United States Department of Transportation and the Office of Hazardous Materials Safety), most widely used, defines the limit for shipment of magnets by air is a maximum of 0.00525 Gauss magnetic field, this magnetic field which must be measured 4.5 meters distance from any point on the outside of the package. There are no restrictions for the transport of magnets by land. That is, if in doubt, send the magnets by ground transportation.

 

31. Neodymium Because magnets are usually coated?

Neodymium magnets are mostly composed most of Neodymium, Iron and Boron. If the magnets are not coated, iron contained in the alloy will oxidize very easily if exposed to air or fluids. Even the natural moisture of the air is enough "for the rust to appear." In order to protect the iron in the oxidation of Neodymium magnets are plated or coated.

 

32. Whats the difference between the different types of plating and coating?

The choice of different types of coating does not affect the magnetic performance of neodymium magnets, except in cases of booting or plastic coating. The preferred coating is a function of the application. The vast majority of applications uses the Neodymium magnets coated (galvanized or nickel).

Nickel is the most common choice for coating Neodymium magnets. Triple coating normally used or, alternatively, nickel-copper-nickel. The nickel plated finish surface is aesthetically superior because the surface is glossy and "silver". It has good corrosion resistance. It's not waterproof!

Zinc has a less attractive appearance, with matte and apparently rougher, being more susceptible to corrosion than nickel. In addition, galvanized magnets can leave residues on hands and other materials.

The epoxy is practically a plastic coating having improved corrosion resistance, since the coating is intact.

The coating Neodymium is used in gold on the nickel layer. The magnets coated in gold have the same characteristics of nickel plated magnets, but with "golden" finish.

 

33. One can paint the surface already coated with a Neodymium magnet?

Yes, you can use any paint to metal surfaces. The use of spray seems to work best. It is recommended for better adherence to the nickel surface, the surface is slightly roughed to more "rough" finish. Sandblasting works well, as does the use of a primer before painting.

 

34. What thickness of the nickel plating (or Ni-Cu-Ni)?

Usually the thicknesses of the three layers are: Ni: 5-6μm, Cu: 7-8μm, Ni: 5-6μm, for a total thickness of 17-20μm.

 

35. Which is the best adhesive to use with magnets?

Many clients have had great success in adhesion to the nickel surface using Loctite 39205 (an acrylic) accelerator with Loctite 7380. Either Loctite 3032 (double acrylic adhesive) with Loctite 770 primer. Many other common adhesives such as epoxy commonly found in stores building materials also work well with Neodymium magnets coated. We recommend the use of sandpaper or other abrasive, if slightly scratching the surface of the magnet, before applying the adhesive.

 

36. The magnets coated with plastics or rubber, if tested, has a smaller force of attraction to others of the same size, but they are only nickel plated or galvanized. Why?

Plastic or rubber, not make them weaker magnets. What happens is that the volume of material contained within the magnetic coating of rubber or plastic is less when compared to nickel or zinc plated magnets of the same external dimensions. Furthermore, the "layer" of plastic material or rubber creates a "gap" between the magnet and the metal surface, decreasing the magnetic attraction force.

 

37. Preventing Neodymium magnets being damaged on impact?

A simple way to protect against the impact magnets with other magnets or metal and hard surfaces is wrapping them with one or more layers of tape. Another great way to protect the magnets from mechanical damage and prevent them from damaging other surfaces is by booting them. The coating magnets with a rubber layer can be easily done through the use of suitable material easily found on the market. First is coated side, using a screw, for example, immersing the magnet on the opposite side of the liquid / rubber. A "rubber" time to half of the magnet, changes the position of the screw and is emborracha the other side.

 

38. Neodímios What are smaller and larger Neodímios that exist in the market?

The dimensional limits for manufacturing Neodymium magnets are these:

• Maximum of 2 "in the direction of magnetization
• Maximum of 4 "in diameter discs and Neodymium rings
• Maximum of 4 "in length and width to the blocks of Neodymium
Minimum of 1/32 "for the thickness of any Neodymium magnet
Minimum of 1/16 "OD
Minimum of 1/16 "diameter hole for any

 

39. Is there a specific recommendation regarding the health or safety of Neodymium magnets?

There are no known concerns regarding exposure to magnetic fields. In fact, many people believe in the healing power of magnets. There may be problems with patients with pacemakers and other devices, but we are not experts, we prefer not to provide more information regarding this particular subject. The fact is that the magnetic field of a magnet is very strong in contact, but almost zero at a distance of 1 meter, for example.

Example: let's take a disc 22x10mm grade Neodymium N35. The magnetic field of the contact is of the order of 4000 Gauss. But at a distance of 30 mm, the magnetic field is practically zero. See below curve showing the variation of the number of Gauss at the surface of the neodymium disc depending on the distance:

 



As for security, the biggest problem is in handling the magnets, as already mentioned. We suggest the use of sunglasses for handling Neodymium magnets. Should the magnets be shocked and break releasing chips, eyes will be protected. Should prevent children have contact with magnets, especially the danger of ingesting them.

The strong magnetic fields of neodymium magnets can also damage "media", such as credit cards, flopp disks, ID cards, etc.. The magnets can also damage televisions, monitors, etc.. You are advised to never approach Neodymium magnets electronics.

Neodymium magnets will lose their properties if heated above 80 ° C.

Neodymium magnets should never be burned, it will generate toxic fumes.

As a tool or toy, neodymium magnets can be very fun and useful, but should be handled and treated with care.

 

40. Which is the safe distance one should keep magnets pacemaker?

As already mentioned, the proximity with Neodymium magnets can cause problems with patients with pacemakers and other devices, but we are not experts, we prefer not to provide more information regarding this particular subject. When in doubt, avoid it! The fact is that the magnetic field of a magnet is very strong in contact, but almost zero at a distance of 1 meter, for example. See the chart above.

 

41. Magnets damage electronic equipment?

Maybe. The strong magnetic field of Neodymium magnets, especially, can damage disks, credit cards, etc.. Neodymium magnets can also damage televisions, monitors, etc.. For other electronic devices such as iPods, cell phones, calculators, etc. that do not contain magnetic media, probably the magnets do not cause damage. But it is best to err on not approaching magnets such equipment.

 

42. Which the distance to be kept between magnets and electronic equipment?

This answer depends on many factors, but as a rule easy to remember, it is recommended to keep the magnet Neodymium distant sound of 100mm + 25mm for each additional 5kg of force of attraction of the magnet in question.

Example: if we take a block of 40x20x10mm Neodymium N35 (whose magnetic attraction force the contact is approximately 20kg and the magnetic field at the surface of approximately 3.500Gauss) the distance to be respected is 100mm + 25mm x 4 = 200mm. The 200mm away from the measured magnetic field is zero.

43. Should always insert a security warning for patients with pacemakers in products / equipment that use magnets?

Although worship answer technical questions that are within reach, especially if they are on permanent magnets, Neodymium magnets, magnetic equipment, electromagnets, or on all magnetic products we manufacture, this particular question has a legal connotation and did not feel qualified to answer it.

Also, when it comes to security, it really depends on the application of the product that uses magnets, the size of the magnets, as magnets are used in the product, etc..

 

44. Magnet Therapy. What magnets are used in treatments Magnet Therapy?

A wide range of magnets can be used in magnetic therapy. Since even small discs of Neodymium larger blocks depending on the size of the area to be treated. The ideal is to select the magnet size depending on the size of the area you want to work.

 

45. Which magnets must be used in the "water treatment"?

The magnets in the main water pipe, must be 1.5 to 2.5 times the outer diameter dimension of the tube. Larger magnets will provide an even more consistent magnetic field. For these applications, we recommend the use of blocks of Neodymium. The "conditioning of water" is more effective when using two magnets, one on each side of the tube in the attraction position. The two magnets, positioned so, create the largest possible magnetic field between them.

Before purchasing the magnets advise that if you search the literature on the subject, which is not our specialty.

 

46. Which magnets are ideal for attaching photos and roles in a refrigerator, for example?

There is a multitude of small blocks and discs of neodymium for this application. We suggest diskettes of Neodymium diâmetro10 by 2mm thick, for example.

 

47. Magnets can be sent in a small envelope in order to save on shipping?

No, magnets can not and should not be sent in paper envelopes. The magnets should be packed in boxes in order to meet specific international rules on the transport of magnetic materials. Especially if we are talking about Neodymium magnets. Of course the magnets that are still demagnetized and therefore generate no magnetic field can be sent without problems and no worries.

Typically, the boxes containing large amount of magnets to be mailed, or even sea shipments, have a "shield" made ??with steel plates. The magnetic field generated by the magnets "closes" inside the box and is not "felt" externally.

 

48. The ITAL own specific catalog on permanent magnets?

Yes, we have a brochure for each type of permanent magnet: Neodymium, Ferrite, Alnico, Samarium Cobalt, Injected, etc.. However, catalogs relating to magnets do not have tables of models. Many magnets are custom manufactured. The others are in stock or are part of our suppliers online. Download your copy from the downloads page of this site.

 

49. Whats the difference between a magnet and an electromagnet?

In fact, it is entirely different things. A magnet is a material composed of several metallic substances which form an alloy. Each league has different magnetic properties and there are several types of magnets. The fact is that the magnet has an intrinsic energy and its magnetic field is permanent. Therefore they are called, redundantly, the "permanent magnets".

The electromagnets are composed of one or more electric coils which when subjected (s) generates an electrical voltage (M) a magnetic field. Interrupted electrical current, clears up the magnetic field. See the typical definition of an old encyclopedia:

= Electromagnet device that produces a magnetic field through a system of coils of iron core driving an electric current. An electromagnet is generally constituted by a magnetic circuit of soft iron or yoke core ending in two specially shaped pole pieces, between which is located a narrow gap. The magnetization is produced by two coils fixed to the breech near the air gap, which then becomes the seat of a magnetic induction field. The electromagnets are invariant gap for the production of very intense fields. The variable gap electromagnets used as lifting devices and as relays, closing the magnetic circuit is ensured by a mobile armor, which is pushed backfired when the coils are energized, and returns to be rejected (under the action of its weight or of a spring) when the current is interrupted.

 

The ITAL has a line of electromagnets with diameters from 20mm up giant electromagnets own weight of over 20 tonnes.

We hope that the above material has helped clarify their basic questions concerning magnets. But if avoidance of further questions, ask them to contact us.