Rubberized magnets, also known as rubber coated magnets or magnets rubber coated, are gradually replacing traditional fastening methods such as welding and bolt fixation. This transition not only shortens installation time but also significantly reduces overall installation costs. rubberized magnets are now widely used in different industries such as electronics, machinery, and automotive.
What Are Rubberized Magnets?
Rubberized magnets are magnets wrapped in a rubber shell. They are usually made of NdFeB magnets, iron sheets, and rubber shells. This structure can avoid damage to the magnets and improve the magnets’ chemical and corrosion resistance. Rubber coated magnets are commonly used for magnetic fixation indoors and outdoors.
Advantages of Rubberized Magnets
Corrosion Resistant | Benefiting from the closed structure the rubber material is inherently corrosion resistant, and the rubber coating is much thicker than other types of neodymium magnets, providing excellent protection for the powerful magnets inside. This makes rubber-coated magnets ideal for use in wet and saltwater environments.
High Friction and Slip Resistance | The soft rubber prevents scratches on the surface of the base, such as highly polished vehicle surfaces. The rubber also has good friction and is less prone to side slippage.
Good Temperature Characteristics | Rubber coated magnets operate well at high temperatures up to 80 degrees Celsius and low temperatures down to -40 degrees Celsius.
Variety of Colors | Common rubberized magnets are mostly black, but we can also customize rubberized magnets in blue, yellow, green, and other colors as needed.
Common Types of Rubberized Magnets
Rubberized magnets with different structural designs are used outdoors and indoors. Common rubberized magnets include rubberized magnets with male threads, rubberized magnets with female threads, rubberized magnets with countersunk holes, etc.
Technical Points of Rubberized Magnets
Coatings | Since the magnet is wrapped around by the rubber layer, the magnet can be uncoated or use low-cost coatings, such as phosphating.
Thickness | The rubber layer can not be too thick, the thickness of the rubber layer is generally 0.2mm; 0.3mm; or 0.4mm. if it is too thick, the gap will increase, and the magnetic force will be attenuated. For example, the magnetic force of a bare magnet is 10 Nm, if the rubber layer is too thick, the magnetic force of rubberized magnets is likely to drop to about 7-8 Nm.
Magnetization | After the magnet is heated inside the mold, the temperature reaches 200 degrees Celsius. It is easy to cause demagnetization and weakens the magnetic properties of magnets. To solve this problem, it is necessary to analyze the specific situation. If the rubberized magnet is a complex structure consisting of multiple magnets, it needs to be installed first and then encapsulating the magnet. If the structure is not complex, then magnetize it after encapsulating.
Process | Magnets are magnetic, and it is necessary to prevent them from sucking up the mold when they are put into the mold.
Prevent the Magnets from Cracking during the Manufacturing Process
Optimize Injection Molding Materials | The magnets are generally NdFeB magnets with high magnetic properties. but the toughness of NdFeB magnets is poor and easy to produce cracks. If the fluidity of the injection molding material is too poor and the viscosity is too large, it will also easily lead to cracks. To solve this problem, you need to choose some good fluidity of the injection molding material
Optimize the Injection Parameters | During the injection molding process, parameters such as injection speed, temperature, and pressurization time have a significant influence on the quality of the final rubber coated magnets. If these parameters are not set reasonably, the magnet is easy to crack. To solve this problem, the injection parameters should be adjusted in time according to the actual situation.
* Images for the article are from Wzmagnetics & Stanfordmagnets
