The Complete Guide of Neodymium Magnets
NEODYMIUM MAGNETS: THE STRONGEST COMMERCIALLY AVAILABLE MAGNETS
Neodymium Magnets are really Strong Magnets made by an alloy of neodymium, iron and boron (NdFeB). Neodymium is a rare-earth element (REE), also called rare-earth metal or (in context) rare-earth oxide. Even at their smallest size Neodymium Magnets have a Really High Magnetic Strength.
They have the highest magnetic field strength and the higher coercivity among commercially available Magnets (which means that they are very magnetically stable). The downside is that neodymium magnets have a lower Curie temperature and are more vulnerable to oxidation and corrosion than samarium–cobalt, alnico and ferrite magnets. They are also quite brittle, To overcome these problems they can be coated with plastic, rubber, nickel or other materials.
Neodymium Magnets can be manufactured with passing holes, threaded holes, threaded rods, adhesive sides, hooks, and snap-hooks. They are available in many different sizes and shapes like: discs, rings and blocks.
Neodymium Magnets: Uses and Applications
The most common applications for Neodymium Magnets are the following:
Electronic Devices: mobile phones, hard drives, headphones, loudspeakers, microphones and more;
Pumps, ventilators, turbines and generators;
PRICE OF NEODYMIUM MAGNETS
What’s the price of Neodymium Magnets?
A Neodymium Magnet, even in its standard grade N35, is way more expensive than ferrite magnets. But other special alloys, like Samarium Cobalt or Alnico, can be even more expensive.
What is the price of Neodymium magnets compared to Ferrite and others?
On average, Neodymium Magnets are nearly 10 times costlier than ferrite magnets. The final price can swing greatly depending on various factors, such as the purchase quantity or the cost of raw materials (Neodymium Magnets are made of rare-earth elements, which are gone-ip in price quite significantly in recent years).
Here is areference table of the cost for a 20x3mm magnetic disc made of Neodymium or Ferrite:
Quantity Neodymium Price Ferrite Price
1 – 30 2,05€ 0,22€
31 – 80 1,64€ 0,17€
81 – 180 1,19€ 0,14€
181 – 350 0,96€ 0,12€
351 – 600 0,78€ 0,09€
What factors make Neodymium Magnets go up in price?
The main factor is the cost of the required raw materials. This price can change rapidly and considerably according to the current market situation. Energy costs also have an impact.
Neodymium Magnets contain rare-earth elements, such as neodymium, iron and boron. Despite representing just about 30% of the total weight of a standard neodymium magnet, these rare-earth materials account for a staggering 80-98% of the total cost of the raw materials.
The Complete Guide of Neodymium Magnets neodymium magnets pots applications specifications characteristics
NEODYMIUM MAGNETS FREQUENTLY ASKED QUESTIONS
What do N35, N38, N40, N42, N45, N48, N50, N52 stand for on Neodymium Magnets?
The letter N followed by a number (usually from 35 to 52) represents the grade (magnetic strength) of the neodymium magnet, which is linked to the magnetic flux output per unit of volume. Higher values mean stronger magnets. For reference, a small N45 3 x 2mm Neodymium disc has a strength of attraction of 0,18 Kg, whereas a N48 has 0,25 Kg (39% more !!!).
Can Neodymium Magnets be cut or drilled?
We advise against cutting or drilling neodymium magnets. Being made by extrusion and from powders, they are very brittle and prone to damage. Moreover, the magnetization could be lost. After you cut a magnet, the polarity will invert where the cut is made. You can find Neodymium Magnets already produced with passing holes, threaded holes and in many different shapes.
If you need a custom made magnet: contact us!
What coatings are available for Neodymium Magnets?
The most common coatings used for Neodymium Magnets are zinc, nickel, gold, black epoxy, rubber and plastic.
If the magnet has to come in contact with the skin, we strongly recommend to opt for a zinc-coated variant, which guarantees that it is nickel-free. Otherwise, the differences between zinc or nickel coatings are just minor and cosmetic, the nickel being shinier and smoother.
Gold and black epoxy coatings offer a different color than the standard gray, but do not improve the grade of protection.
Plastic and rubber coatings protect the Neodymium Magnet from rust, oxidation and damage by impact. The Complete Guide of Neodymium Magnets
Can Neodymium Magnets lose their magnetization?
Under normal circumstances, Neodymium Magnets lose 1% of their magnetism each year. If, on the other hand, they are exposed to temperatures higher than recommended (the standard being 80 degrees Celsius), or to electric discharges (galvanic bath), they will likely lose their magnetism altogether. In a theoretical scenario, where 10 magnets undergo the same stress, it is not guaranteed that all of them will become unmagnetized, but is very likely that a good portion of them will.
What temperature can a Neodymium Magnets withstand?
Without a specific treatment, Neodymium Magnets can resist a maximum temperature of 80 degrees Celsius. Beyond this threshold there could be a permanent loss of magnetization (partial or total). By opting for special treatments we can push this limit as far as 200°C.
What do the letters M, H, SH, UH and EH mean when referring to Neodymium Magnets?
All these acronyms indicate the maximum temperature a magnet can withstand before permanently losing some of its magnetization. One of these letters can be placed after the grade of the magnet to indicate its resistance to demagnetization. An example for a magnet with an “M” resistance is N35M; this generally means that a magnet can be used for applications up to 100°C. An “H” magnet performs ok up to 120C, “SH” up to 150C, “UH” up to 180C, “EH” up to 200C, and a “TH” up to 220C. These are general parameters, and other factors do play a role in coercivity decisions. 80 degrees Celsius is the standard limit (no acronym in the product page), but on request we are also able to produce magnets with higher heat resistance.