FAQ
Our Advantages:
Material: Use original high-quality rare earth materials, Never use waste, recycled material
Quality: In strict accordance with the process and quality control. Pay much attention to product details, each magnet will be inspected carefully.
Competitive Price: Direct manufacture of magnets, direct profit to customers Certificates: RoHS compliance, ISO, Reach Standard, SGS , CE Sample Charges: Free samples are available for common color and size, Not including the express cost. Customized samples will charge a small amount.
Samples Lead Time: Around 3-5 days
Production time: Around 7-15 days for regular shape magnets after samples confirmed.
Professional Service: One-stop solution service from Design to shipment.
What is Neodymium Magnet:
Neodymium magnet, 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.Developed in 1982 by General Motors andSumitomo Special Metals, neodymium magnets are the strongest type of permanent magnet commercially available.They have replaced other types of magnets in the many applications in modern products that require strong permanent magnets with smaller size, such as motors incordless tools, hard disk drives and magnetic fasteners.
Why do magnets need to be plated?
Magnets can only be electro-plated before magnetization. if the plating is compromised after magnetization via abrasion or deliberate machining they cannot be re-plated. Some coatings such as plastic may be done after magnetization, If the process does not exceed the magnets maximum operating temperature.
Oxidization (rust):
NdFeB magnets will oxidize(rust) if left exposed. When a plating wears down or cracks, the exposed area will oxidize. An oxidized area will not result in complete degradation of the magnet, only the oxidized area will lose its strength. However the magnet will lose some structural integrity and become more susceptible to breakage.
Durability:
Depending on shape, permanent magnet substrate is brittle. A multilayered metal plating like nickel or zinc improves the magnets resistance to chipping and wear, particularly around corners.
Harsh Environments:
Plating vary in their tolerance of different harsh chemicals and abrasion. Salt and humidity in regions near the ocean are commonly overlooked when selecting a plating. Be sure to consider the magnets environment when selecting a plating. The most common type of plating for neodymium magnets Nickel (Ni-Cu-Ni) Intended for indoor use. It has proven to be very resilient when subjected to normal wear and tear. However it will corrode outdoors in prolonged exposure to salt water, salty air, or harsh chemicals.
Ordinary Coatings & Plating on Our Neodymium Magnets:
Nickel (Ni-Cu-Ni) :
The coating thickness will be around 10-20 Microns. A very durable multi-layers combination of nickel, copper, nickel. The most common plating. Nickle plating is with good resistance to Abrasion&wear, Humidity, while Bad to Salty air , water & salty Water.
Zinc Plating (Zn):
The coating thickness will be around 8-10 Microns.2nd most common plating, Zinc is a standalone plating with only one layer. It is a self- sacrificing coating, meaning when the material corrodes the outside turns white creating a durable layer of protection. Zinc plating is with good resistance to water, salty air ( Near Ocean), while bad to salty water.
Epoxy (Ni-Cu-Be):
The coating thickness will be around 15-25 Microns.Epoxy plating is multilayered in Nickel, Copper, Epoxy. Great for outdoor applications. However it is not very abrasion resistant and prone to scratching.
Gold (Ni-Cu-Au):
The coating thickness will be 10-20 Microns. Well known for its corrosion resistance. Layered in Nickel, Copper & Gold on top. Works very well in water applications.The gold layer is very thin and adds only a few cents per magnet.
Plastic:
The coating thickness will be 250-500 Microns. Plastic is the most corrosion resistant. However its is thicker than other plating. A mold is required to create the plastic shell.
Phosphate:
Phosphate is a temporary coating that will last only a few months. It is normally used when the magnet is going to be over-molded or encased in a plastic part that will act as the final protective layer.
About Magnetization Directions:
Disc and Cylinder magnets can be axially or diametrically magnetized.
Block magnets are defined by three dimensions: Length, Width and Thickness. To be consistent, we define the Thickness dimension along the axis of magnetization. The thickness is usually the smallest dimension, but not always! We’re sometimes asked if we can provide block magnets magnetized through the length or width. Yes, we do have some long “bar” magnets, where the magnetization is in the longest dimension. We do still define this as the Thickness, though.
Ring magnets can be axially or diametrically magnetized.Spheres can only be axially magnetized. There is only one possible direction.
Mounting Magnets,Round Mounting Magnets are assembled with an axially magnetized disc or ring magnet set inside a steel cup. The north pole of the magnet faces outward.
Our Rectangular Mounting Magnets are constructed in a similar fashion.Arc Segment magnets can be magnetized in one of four directions.
Grades and Working Temperature:
Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets and range from N35 up to N52. Letters following the grade indicate maximum operating temperatures (often the Curie temperature), which range from M (up to 100 °C) to AH (230 °C).
N35-N52: 80 °C N33M-N50M:100 °C
N30H-N48H:120 °C N30SH-N42SH:150 °C
N45SH: 180 °C N30UH-N38UH: 180 °C
N40UH: 200 °C N28EH-N38EH: 200 °C
N28AH-N33AH: 230 °C
Dimension and Tolerance of Our Neodymium Magnets
Block Magnets, Bar Magnets, Cube Magnets,Square Magnets
Disc Magnets, Cylinder Magnets, Bar Magnets
Ring Magnets, Countersunk Magnets
Arc Magnets, Segment Magnets
