As magnet experts, we understand that only some are knowledgeable about magnetic products or know which type of magnet would suit their needs. That’s why we have a team of experts to assist you with your purchase. But before moving forward, it is important to have some basic knowledge about magnets.
You do not need a degree in Physics to make an informed decision. Plus, being mindful of the precautions while working with magnets is necessary. Thus, to help ensure you don’t fall victim to scams or any mishap while working, we’ve provided some key factors to consider before buying magnets, such as shape, size, material, and safety guidelines to practice.
Standard Magnet Shapes
The characteristics of a magnet can vary significantly depending on its size and shape, such as round, ring, square, or segmented. When selecting a magnet, it’s important to consider whether it fits appropriately in the intended object and is too thick or thin. Always opt for a size that would be easy to handle.
Multiple trustworthy magnets manufacturers offer a broad selection of round neodymium magnets with diameters ranging from φ1mm to over φ100mm. This variety ensures you can find the right size to suit your needs.
However, standard magnets shapes are:
- Adhesive-backed strips and sheets
- Flexible strips and shee
Type of Magnet Material You Need
Different magnetic materials are available, each with unique physical and magnetic properties. Powered by natural environmental magnetism, permanent magnets do not require an energy force and are suitable for DIY projects like fridge magnets.
Neodymium magnets, an alloy of neodymium, iron, and boron, are the most common type of magnet, followed by samarium cobalt magnets.
When selecting a magnet, it’s important to consider its type, size, and shape. Usually, magnet manufacturers provide a diverse range of radial ring magnets, with different materials like neodymium magnets with diameters ranging from φ1mm to over φ100mm, ensuring that you can find the right size for your needs.
Common Magnet Coatings
Magnets are inherently brittle and can chip, break, or corrode, so they are typically coated or painted for durability and aesthetic purposes. The most common coating for magnets is nickel steel, which gives the magnet a bright silver appearance. Magnets can also be coated with plastic or rubber, available in various colors but typically appear in dark hues. Additionally, magnets can be embedded in products during plastic injection molding, creating molded plastic or rubber magnets.
The adsorption power of a china magnet refers to the weight in kilograms (1 kgf = 9.80665 N) that it can hold when attached to an iron plate thicker than the magnet and pulled perpendicularly in the direction of magnetization.
The value for adsorptive power in kilograms (Kg) listed for each magnet size represents the maximum utilization of the magnet’s properties. However, this value is a reference and not a guaranteed figure. Therefore, please refer to these values to assist in selecting an appropriate magnet.
The Magnetic Flux Density
The list of magnet sizes provides a reference value for the magnetic flux density, which is measured in gauss or millitesla. Magnetic flux density refers to the number of magnetic field lines per unit area. The SI unit for magnetic flux density is the tesla (T), while the CGS unit is the gauss (G).
Surface magnetic flux density, a property determined after the magnet is machined and the product is completed, can be measured using a device such as a gauss meter or predicted using calculations. However, there is no standard in the magnet industry for measuring surface magnetic flux density. This is because different manufacturers use different measurement devices, environmental conditions for measurement, and calculation formulas.
Precautions To Handle Permanent Magnets (Except For Flexible Magnet Material)
To ensure personal safety and extend the lifetime of magnets, it is crucial to follow recommended handling, storage, and safety guidelines specific to each magnet’s properties. The following are general safety rules for handling magnets:
- Due to their brittleness, gloves and eye protection may be essential when handling magnets, depending on their potency, to avoid chipping or shattering.
- Magnets should not be close to media gadgets or older electronics like floppy disks or tapes. Yet, smartphones are secure near small magnets, and rare earth magnets are utilized in phone speakers. Many cell phone back covers and mounts also encompass magnets.
- Magnets can hinder navigational supplies, such as compasses. Hence, magnets are imported by air only when required and must be packaged to deter their magnetism from permeating the box.
- Magnets should be kept out of reach of children and pets, as they can induce severe damage if swallowed. If more than one neodymium magnet is consumed, it can tie up the intestines closed and require surgery or even result in death. If swallowed, 9-1-1 should be called immediately.
- Individuals with pacemakers or other magnetic medical gadgets should avoid contact with magnets, particularly near the medical device, such as magnetic name badges.
- Stored magnets should be accurately marked to ensure they are readily identifiable. If a magnetic body can be turned on and off, it should be held in the off position.
- When separating strong magnets, it is safer and easier to slide them apart than pull them apart. A table edge or external separating aide, used with the assistance of another person, can be helpful in the separation process of stronger magnets. Many magnets come with keepers or spacers that should be used in storage and transit.
In conclusion, when buying magnets, it is important to consider their size, shape, strength, and intended use. Be sure to select the right type of magnet for your specific application and follow the recommended handling and safety guidelines to ensure the safety and longevity of your magnets. Additionally, look for reputable magnet manufacturers and suppliers who can provide information on the properties and specifications of their magnets. With these tips in mind, you can make an informed decision when purchasing magnets for your needs.