Samarium Cobalt magnets have Br values between 8. Rare-earth magnets are made of neodymium iron boron (NdFeB). It is the most commonly used neodymium magnets among N rating. The magnetic force pulls the magnet straight towards the steel door. Most neodymium magnets are plated with nickel. The magnetic length. Neodymium compounds are of low to moderate toxicity, yet its toxicity has not been thoroughly investigated. 11 for 1 to 9 items. Fill in all of the blank calculation fields, click the calculate button and the results will appear. These magnets can then sliced into smaller magnets or ground to tighter tolerances. they generate their own magnetic field) made from an alloy of the metallic elements neodymium, iron and boron. 2. For example, a neodymium magnet of grade N42 has a strength of 42MGOe. Neodymium magnets are a permanent type of Rare Earth Magnet, made from neodymium, iron, boron and other transition elements. Neodymium is the strongest type of permanent magnets, samarium cobalt is the second strongest. 5 to 7. We also offer bulk discounts, free shipping, and a 30-day return policy. All dimensions are in inches. The difference between n35 and n50 magnets is the maximum strength that they can be magnetized to. 5/cm³ Vickers Hardness 600Hv Tensile Strength 8. In general, higher numbers indicate a stronger magnet. Each magnet has a grade, which typically denotes its strength. At first4magnets. N35SH. At room temperatures, NdFeB magnets exhibit the highest properties of all magnet materials. They have an elaborate manufacturing process of vacuum melting, milling, pressing and sintering. Electrical machines using permanent magnets are more efficient than those without. Quantity. The n42 magnet pull strength depends on neodymium magnet sizes, the plating and how it is used. Some of which are N35, N38, N42, N45, and N48. Imagine you have two neodymium magnets: one is an N35 magnet, and the other is an N52 magnet. Neodymium grades are from N35 to N52, with N45 considered one of the strongest grades. 1. This means that when defining your magnet need, it is important to keep in mind that the higher the BHmax, the stronger the magnet will be. More Magnetic Strength. Magnetic Permeability is simply the ability of the material to form an internal magnetic field within itself under the influence of an applied magnetic field. high-performance neodymium-iron-boron magnets is in the motors of electric and hybrid vehicles. Material: Neodymium magnets, Stainless Steel & 3M foam adhesive. They are widely used as. The basic principle is that the higher the number the stronger the magnet. Samarium Cobalt and Neodymium Iron Boron both make very strong magnets. It is a method of measuring a magnet’s max strength & the limit of that magnet’s holding power. Our inventory contains a large sampling of the different grades, however, if you need a different grade, shape or size. 07046 - N35¸ 0. 11%/°C Density 7. Mounting Magnets are strong neodymium magnets that are set inside a steel cup or channel. 70 per kg on Jan 1st 2021 it has increased +13. These magnets are widely used in products like microphones, professional loudspeakers, in-ear headphones, high-performance hobby DC electric motors, and computer hard disks, where low magnet mass (or volume) or strong magnetic fields are required. $1. The exact ingredients depend on the grade or strength of magnet being produced. Buy neodymium magnets in over 250 different shapes and sizes, including strong N42, N52, and N55 magnets. com. In summary, the longevity of a neodymium magnet depends on various factors, including environmental conditions, usage, handling, and the quality of the magnet. 180-750. It has a diameter of 8mm and a height of 2mm and is axially magnetised through the 2mm thickness. 75% this year. Ferrite Magnetic Discs 14 x 8 mm Y30 for Assembling Products or Handcrafts. They are over 10 times stronger than the strongest ceramic magnets. 90%. Alnico magnets come in several variations with different amounts of aluminum, nickel, and cobalt. It provides information about the magnetic field strength. £24. Fingers are quickly caught between them which can cause blood blisters or cuts. Product Description. Permanent magnets (PMs) produce magnetic fields and maintain the field even in the presence of an opposing magnetic field. Maximum energy product, also referred to as BHmax is. But the rate at which different types of magnets lose strength varies. AA batteries have performance charts that only go up to 0. The moment the neodymium magnets were released, the can of Coke was instantly crushed by a powerful force, scattering the Coke all over the place. Compared with many cheaper N35 grade neodymium magnets, their magnetism is 20% higher. The magnets are positioned with opposite poles facing one another, so that the magnets are attracting towards one another. Our inventory contains a large sampling of the different grades, however, if you need a different grade, shape or size. Neodymium magnets are a combination of Neodymium (Nd), Iron (Fe) and Boron (B), and are also referred to as NdFeB or Neo. Strong N52 grade neodymium rare earth magnets, available in discs, cylinders, blocks and rings. The grades of. What makes them so unique? Learn more in our comprehensive guide now. The lower NdFeB magnet grades are no longer made and the range now starts at around N30 or N33. The number in the magnet grade refers to the strongest point of the material’s B-H curve, or its maximum energy product. Magnetic Field Calculator. • Magnetic field gradient is much stronger compared to non-shielded,These units represent the magnetic field strength at a particular point in space and are commonly used to measure the strength of neodymium magnets. Neodymium (NdFeB) magnets are incredibly strong and have a maximum strength (BHmax) from 30 MGOe to 55 MGOe. Neodymium magnets are rare-earth magnet materials with the highest magnetic properties. Read more about where neodymium magnets are used in. The Original K&J Magnet Calculator. Available. Coeff. 49. 07buy 100+ items and save 33%. Blackmore, (TRIUMF, 1985) and A. Magnets tend to lose their strength over time. A low coercivity grade Neodymium magnet may begin to lose strength if heated. To make sense of neodymium magnet grades and tables, you’ll want to wrap your head around the following parameters: Maximum Energy Product (BHmax): Measured in Mega-Gauss-Oersteds (MGOe), it represents the magnet’s energy density or magnetic strength. Among the non-rare-earth permanent magnets invented so far, only two are in large-scale production: ferrites and another type called Alnico (aluminum nickel cobalt). You can measure the magnetic field in teslas or the magnetic flux in webers or Teslas • m 2 ("tesla square meters"). E. It represents the strongest point on the magnet's Demagnetization Curve, or BH Curve. Each individual layer of Nickel and Copper are 5-7 μm thick. Unit Price Each. For maximum energy product, convert megaGaussOersteds (MGOe) to. If these magnets are arranged according to their magnetic force from large to small, they are NdFeB magnet, SmCo magnet, AlNiCo magnet, and ferrite magnet. The grade without suffix letter has maximum operating temperature 80°C, however N52 & N55 (the highest. 07 ounce) piece is enough to stick a substance more than 640 TIMES than its weight. Saturation Field Strength. Neodymium (also known as "NdFeb", "NIB" or "Neo") disc magnets are the most powerful rare-earth magnets available today. A neodymium magnet in there, even an un-magnetized one, might only be a little better than an air core. Available in disc and cylinder shapes, Neodymium magnets have magnetic properties that far exceed all other permanent magnet materials. Roughly 2/3 of a neodymium magnet is composed of iron. These ferrite magnets have a medium magnetic strength ratio and they can be used at high temperatures. Identifying a neodymium magnet involves examining its visual appearance, magnetic strength, weight, size, resistance to heat, and price. The magnets are positioned with opposite poles facing one another, so that the magnets are attracting towards one another. Read more about these two types of magnets. The grade of the metal, surface condition and angle of pull all have an impact on the pull strength. N52 magnets are approximately 50% stronger than N35 magnets. Common finishing options include uncoated, nickel (Ni-Cu-Ni) and gold (Ni-Cu-Ni-Au) plated coatings. F335-N52. 1. N42 grade offers a high performance at an economical price. You can measure the overall magnetic strength of a magnet (called the magnetic moment) or its local strength (called the magnetization for short). Neodymium is a rare earth element that is. On returning to normal operating temperatures below 176 degrees F, there is an irreversible loss in magnetic strength and permanent damage. Home; Call Us; 0345 528 0474;. Ideal for home, school, office and shop. 5 to 1 Tesla. Continue reading →1 - Neodymium iron boron (NdFeb) Neodymium magnets are the most powerful magnets available (per unit volume) with the ability to attract 1,000 times their own weight. 3. There. When classifying neodymium magnets according to their magnetic strength, the grades come into view. The 12,000 Gauss neodymium grate magnet option has a pull strength of 13. 45buy 1000+ items and save 24%. Magnetic characteristics distribution charts of FB Series Transition of material group development. N45 – Mid-range neodymium magnet. If they break apart, the small pieces can be a choking hazard. ,LimitedStandard car magnet sizes and guidelinesIndex of /images/img_oth Car magnets – rainbow printingMagnetic strength chart. Grade magnets 1st anchor chart 2nd science magnet activities. 12 best images about world religion on pinterestChristianity vs mormon mormonism chart choose board doctrine Mormonism shares many unsusual historical features with christianityMormon vs. kA/M. 6kg. There are four main types of permanent magnets – neodymium, samarium cobalt, alnico and ferrite. 49), so we want to identify them. 6 Neodymium magnets are also used in wind turbines, aeronau cs and space. They are commonly used in applications such as. pull. 50. Unit Price Each. This is the super short answer to a question which touches a topic with a lot of facets. At Adams Magnetic Products, we offer the following types of hard ceramic magnets: Ceramic ring magnets: These magnets are typically used in craft, hobby, and manufacturing projects. This number is a material property which is independent of the magnet shape. At first4magnets. Neodymium magnets are sensitive to heat. Despite offering substantial magnetic strength, they still fall short compared to neodymium magnets. The term “rare earth” can be misleading, because. B = the magnetic field strength at the center,. We offer a diverse range of Neodymium rare earth magnets in different sizes, grades, and shapes, including discs, blocks, rods, and rings. Characteristic: Units; C // C. Nacho Magnets Strength Neodymium Motor Magnets Stock Aurora red/green 11. At room temperatures, NdFeB magnets exhibit the highest properties of all magnet materials. Boots horse mountain sovereign riding rider tall equestrian ladiesMountain horse winter boot collection – mountain horse usa Buy mountain horse vermont lace tall bootHorse boot size chart. Check out our full collection here. This neodymium magnet achieved the world's highest levels of residual magnetic flux density Br, intrinsic coercive force H. Each one is unique, and there’s no simple formula for translating a system from one magnet type into the system for another. N35 and N52 magnet demagnetization curves. magnet pull strength: Exposing magnets to high temperatures outside their design range may cause magnets to fail completely or show signs of weakening. They would could use something like a DC Hysteresis Graph test to determine the magnet's properties. ¸ 4. Our high-quality Rare Earth Magnets are made from alloys of rare-earth elements. NdFeB can be used at low temperature but at around 135 Kelvin (-138 degrees C), the direction of magnetisation is. 9. From £1. Technical information about different grades of super strong neodymium magnets. 001 tesla. For example, a 10mm diameter by 3mm thick N42 neodymium magnet has a Gauss rating of 3600 while the same magnet but 5mm thick has a Gauss rating of 5100. For example, you are going to be driving your car during a storm. Many online calculators we've seen determine pull force based on a theoretical calculation of the flux density. The grade N42 means a neodymium magnet has a maximum energy product of 42 MGOe. Larger magnets (30 cm3+) can crush fingers and break bones. $20. At first4magnets. Conclusion. After that, they also used an apple to do the experiment to test how strong neodymium magnets can be. NdFeB Magnet NdFeB magnet is a tetragonal crystal composed of neodymium, iron and boron (Nd2Fe14B). Magnets tend to lose their strength over time. Neodymium N52 Disk Magnet 1mm x 1mm 1000pcs. (Field Strength) (PermeanceCoeff 1) di B Hd + = (oersteds). All Pull Force values based on extensive testing in our laboratory. A higher grade number indicates a higher magnetic strength. See Our Range of Neodymium Magnets. $0. Most of our magnets are grade N42 or above. A Neodymium (Rare Earth) magnet Grade (for example, N42) is an accurate guide to the strength of a magnet. 2 The Maximum Operating Temperature shown here is for magnets operating at a Permeance Coefficient of 2. 7-15 μm. Other than that, there are only minor differences between the two grades. Nd 2 Fe 14 B or Neodymium-Iron-Boron magnets can be sintered or bonded. That “N” number relates to their maximum energy product, a measure of strength expressed in MegaGaussOersteds, or MGOe. 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 !!!). Typically, the higher the magnet grade, the greater the corresponding strength of the magnet. The NdFeB magnets are the strongest type of magnet commercially available and are manufactured in a wide. (7MB) This PDF catalog features a magnet materials overview, chart of materials properties and demagnetization curves for Neodymium, Samarium Cobalt, Ceramic (Ferrite) and Alnico materials offered by Adams. Samarium Cobalt Block Magnet. Neodymium Magnets Products are divided into two major categories: Sintered Neodymium Magnet and. they generate their own magnetic field) made from an alloy of the metallic elements neodymium, iron and boron. Key Features: Material: Premium N35 Neodymium. Moisture Chart For Corn. For magnetic flux density and magnetic induction (B), convert Gauss (G) to Tesla (T). Sagawa, Hadjipanayis, and Croat independently discovered Nd-Fe-B based rare earth permanent magnets almost simultaneously in 1984. Due to their high magnetic strength and relatively low-cost, neodymium magnets are. Frenergy Magnets offer a wide, inexpensive, and high-quality range of Neodymium Rare Earth Magnets to customers both in Australia and overseas, ranging in grades from N35 to N52, and in pull force from 58grams to 1000kg. From £12. Alnico magnets have 5 to 17 times the magnetic force of magnetite or lodestone. Neodymium magnets in the UK are the strongest commercially available magnets, meaning that. They are made from an alloy of neodymium, iron, and boron. The following number comes from an actual material prMagnetic Field Calculator. has the highest permeability on the chart, and. Order online for. This chart only applies to disc/cylinder magnets with the diameter and thickness shown. The size of a neodymium magnet directly impacts its strength. If it is really important for you to know the grade, you can send magnets out to be tested. The bar chart shows the magnetic power (MGOe) of each type of magnet. This magnet strength chart is useful to find the right magnet strength for your needs, whether you want a strong neodymium magnet for a high-performance job. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements. A Neodymium (Rare Earth) magnets Grade (eg:N42) is an accurate guide to the strength of a magnet. N42 grade offers a high performance. Neodymium magnets are often assembled into products using strong adhesives such as Loctite 325. A Magnetic field is an invisible flux moving from one end of the magnet to the other, as shown in Figure 1. [1] One tesla is equal to 10 4 gauss. 156'' Dia. Magnets are stronger when the number is higher. thick - 0. Magnetic jewelry – Magnetic therapy jewelry is often made with neodymium magnets; these magnets are also used in bracelet and necklace clasps. It is lower in cost but approximately 30% less potent than N52. Car magneticsCar custom dia magnet magnets Car magnets magnet sizesCar magnet custom oval magnets. No amount of externally applied magnetic field will bring the magnet's strength back. Most neodymium magnets are plated with. Press these magnets into a drilled. Neodymium is one of the more reactive lanthanides—a group of similar metallic elements numbered 57-71 on the periodic table. Pull force, also known as magnetic pull, is a measure of the strength of a magnet's magnetic field. Neodymium alloys are used to make high-strength neodymium magnets, a powerful permanent magnet. Inspection Mirrors. e. This tool calculates magnetic field strength measured in gauss, on the centerline of a disc magnet or ring magnet magnetized through its thickness, at a distance of X from the surface of the magnet. This tool calculates magnetic field strength measured in gauss, on the centerline of a disc magnet or ring magnet magnetized through its thickness, at a distance of X from the surface of the magnet. For maximum energy product, convert megaGaussOersteds (MGOe) to. 5 tesla. Magnetized. High energy for size. 1 High performance neodymium magnet for IPM motor NEOREC Series Neodymium Magnets Magnetic Materials Information. Their strength is often given in terms of its gauss rating; depending on their shape and grade, this type of magnet may rate 13,500 gauss or more, although a small one usually rates about 2,000 gauss. Be aware that standard neodymium magnets will lose strength if heated over 178°F. Resulting Force (lbf): Neodymium Magnetic Pull Force Calculator calculates expected pull forces based on a single magne testing. O. Neodymium N52 Disk Magnet 1mm x 1mm 1000pcs. The big difference is in the optimum temperatures for each magnet. Magnet neodymium magnets temperature chart strength magnetic low performance n52 rare earth temperaturesNeodymium magnet grades Neodymium magnets grades permanentSafety info – magneticpoetry. Neodymium (neo) magnets, which are part of the rare earth magnet family, are popular for their extreme strength in a compact size and weight, and for their high coercive force (they are permanently magnetized for use in temperatures below 590°F). Around 10% of permanent magnets (4 kt neodymium) were used for wind turbines, notably offshore turbines and Chinese onshore turbines. Overall, our best guess for neodymium market demand in 2021 is around 20-30kTpa. The fragments that come off can stick magnetically back onto the magnet creating a “dirty” magnet. In general, higher numbers correlate with a stronger magnet. com, we do not compromise on quality and the majority of our magnets are grade N42 or above, making them 20% more magnetic than many cheaper N35 grade neodymium magnets. At Stanford Magnets, we do not make any compromises on quality. significantly below neodymium magnets. Not only are they more potent, but they are also more compact, offering superior performance in a smaller package—a. Magnetic properties In its pure form, neodymium has magnetic properties—specifically, it is antiferromagnetic —but only at low temperatures, below 19 K (−254. A round neodymium magnet with a diameter of 20mm and a thickness of 3mm has a pull force of approximately 3. This magnet produced from rare earth. And it is more completely and precisely than a single number like pull force or surface field. The maximum energy product of a magnet is measured in Mega Gauss Oersteds (MGOe). It is a measure of magnets strength rating. Often measured in. 85 kilo-Gauss for Ceramic magnets. In conclusion, the strength comparison between electromagnets and neodymium magnets reveals a captivating interplay of dynamic adaptability and unwavering permanence. Br, Residual Induction. In stock and ready to ship. Neodymium Iron Boron Overview Key Benefits • Very high strength • Relatively low cost (by weight about 20 time Ferrite magnets, by "Dollars per BHmax" about 1. Part of the Rare-Earth magnet family, they have the highest magnetic properties of all permanent magnets. High temperature grades of neodymium. Magnets made with neodymium are the strongest of the rare-earth magnets. Add to cart. Unfortunately, this simplification. A rare earth magnet is a magnet made from one of the rare earth elements (of which there are 17) in the Lanthanide series of metals in the periodic table. $3. Your online source for incredibly powerful neodymium magnets. 3-3. Pull the scale upward very slowly while maintaining a perpendicular angle. The magnetic properties of the various grades of neodymium magnets are adjusted by using varying amounts of rare earth elements in the alloy mixture, with each element adjusting the. While electromagnets. Others: The Breakdown. 52. $1. Yet, N52 magnets are 50% stronger than N35 magnets (52/35 = 1. The grade is a good indicator of the strength of a magnet. There are four main types of permanent magnets – neodymium, samarium cobalt, alnico and ferrite. Looking for Super Strong Neodymium Magnets?. Neodymium magnets were first developed in 1982 by General Motors and Sumitomo Special Metals following the formulation of the alloy NdFeB, which is made of neodymium as well as iron and boron. A magnetic bracelet using 3000 gauss magnets with 20 - 3mm magnets is half the strength of a bracelet with 20 - 5mm magnets. They are from the Rare-Earth magnet family and have the highest magnetic properties of all permanent magnets, stronger than Samarium Cobalt (SmCo), Alnico and Ferrite. In addition to their high magnetic. 947. The epoxy magnet with no visible rust tested just fine. by other permanent magnet shapes such as a disc of the same diameter. Learn more about our 3/8"x1/16" Rare Earth Neodymium Disc Magnet. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements. 70 per kg on Jan 1st 2021 it has increased +14. The largest Rare Earth component in permanent magnets is Neodymium, comprising 27% by mass of Nd2Fe14B magnetic material. A round neodymium magnet with a diameter of 20mm and a thickness of 2mm has a pull force of approximately 2. (Typical ranges for standard Eriez Rare Earth (RE) magnet circuits are up to 150 degrees Fahrenheit, 150 to 250, 250 to 400 and maximum 850 degrees Fahrenheit. There are other N ratings of neodymium magnets. Neodymium Grades A Neodymium (Rare Earth) magnets Grade (eg:N42) is an accurate guide to the strength of a magnet. 004” to 0. e. A neodymium magnets (also known as NdFeB, NIB or Neo magnet), the most widely used type of rare-earth magnet, is a permanent magnet made from an alloy of neodymium, iron and boron to form the Nd2Fe14B tetragonal crystalline structure. To put that in perspective, the Earth's magnetic field is about 0. NdFeB Magnet. There are eight standard grades of these permanent rare earth magnets. The surface. This strength is due to the tight arrangement of the crystalline structure of. Ceramic magnets have a lower magnetic strength compared to neodymium magnets. The flux consists of moving or spinning electrically charged particles invisible to the eye. This one is 4mm, type 3, and has 7 braided core yarns that enables it to have a minimum strength of 550lbs making it a perfect compliment to the 500lbs magnet. Production R&D. 0" L x 0. Model: A-POLE-1. 75 pounds). It shows the minimum distance to get below 5 gauss for many disc / cylinder magnet sizes. Price. Having enough force to levitate it isn’t the problem. Water Treatment Magnets. The Gold and Silver plating layers are 1-2 μm thick. National Imports manufactures MAGCRAFT® brand neodymium magnets for science, innovation, engineering, and. Attributes of Neodymium Material. This is the primary indicator of a magnets ‘strength’. These values are based on both theoretical models and extensive laboratory testing. Neodymium has one of the highest magnetic properties of any magnetic alloy. 1 offer from $15. The magnetic field generated by 3T MRI (also known as 3 Tesla MRI) is made up of three layers of 3-tesla magnets. Grades of ndfeb magnetsBuy strong neodymium magnets,rare earth magnets,n52 magnets reviews Magnet grade grades magnets neodymium strong rare earth strength n52 temperature strongest reviews buy should chooseGrades magnets teachersparadise. 99 $19. N rating. Good ones have an attractive. fastest shipping! No Minimum Order! K&J Magnetics, Inc. The number comes from an actual material property, the Maximum Energy Product of the magnet material, expressed in MGOe The grades generally available to buy, range from N30 to N52 as lower grades are generally no longer manufactured. R x 90 degree x 5mm thick N42 Neodymium Arc Magnet - 5kg Pull. 1 15 10 Compressive 700 Tensile 35 Young's modulus (GPa) 200equations or charts; for example, see Rollin J. 21 for 10 to 99 items and save 10%. Neodymium compounds are of low to moderate toxicity, yet its toxicity has not been thoroughly investigated. 5 products. This distance may be closely related to a minimum safe operating distance for pacemakers and ICDs. A rare earth magnet is a magnet made from one of the rare earth elements (of which there are 17) in the Lanthanide series of metals in the periodic table. Simple tests like a paper clip, coin, or magnet-to-magnet tests can further confirm if a magnet is made of neodymium. It shows the minimum distance to get below 5 gauss for many disc / cylinder magnet sizes. 10 Pcs of N48 Neodymium Magnets 1/8 inch Cube. 47 for 100 to 999 items and save 20%. Pull-Off Test: A pull-off test is a simple and effective method to test the adhesive strength of a magnet. + Moderate Mechanical Strength. WPH-LG. Additional info. There are five main types of permanent magnet material; these are, in order of strength from strongest to weakest, neodymium, samarium cobalt, alnico, ferrite, and flexible rubber. At today’s price of $124. List of Magnets by Strength. which the magnet is operating. Neodymium dust and salts are very irritating to the eyes. This magnetic power is known as maximum energy product / MGOe (Mega Gauss Oesteds). Low working temperature for heat applications, but higher levels of heat resistance materials are being. 0 kilo-Gauss, and 2. Click here to go to our Repelling Force Magnet Calculator that shows the repelling force generated between two same-sized magnets. The steel housed magnetic assemblies are also often referred to as POT magnets, or CUP magnets. A magnetic field of 35 gauss is defined by the number “35,” which indicates the maximum strength of neodymium. #3. The main phase of Neodymium magnet is Nd 2 Fe 14 B and maximum energy products achieved 280kJ/m 3 at that time. These 15mm diameter 5mm thick Neodymium N38. At this point, a neodymium magnet’s direction of magnetism will alter, resulting in a loss of performance between 10 and 20%. In terms of power, a rare earth magnet is about 2-7 times stronger than a standard magnet. These magnets are widely used in products like microphones, professional loudspeakers, in-ear headphones, high-performance hobby DC electric motors, and computer hard disks, where low magnet mass (or volume) or strong magnetic fields. Moderately priced. That's the property that tends to redirect the electromagnet's field through the core. Description. Neodymium is the strongest type of permanent magnets, samarium cobalt is. Neodymium magnets are. Neodymium is also used in the glass for tanning booths, since it transmits the tanning UV rays but not the heating infrared rays.