Rubber Coated Magnet

Rubber magnets and a rubber coated magnet, despite similar names, differ in structure, strength, and applications. Rubber magnets combine magnetic powder with a rubber binder, forming a flexible, easily shaped material with low magnetic strength, ideal for consumer products like refrigerator magnets and flexible sheets for advertising or education, where adaptability matters. In contrast, a rubber coated magnet, also known as a rubber covered magnet, features a magnetic circuit encased in a protective rubber layer, designed to shield the magnet and prevent surface scratches during use across varied environments.

This rubber coating on a rubber coated magnet ensures durability and weatherproofing, while the internal magnetic circuit delivers high magnetic strength, ideal for indoor and outdoor applications needing robust pull force. The protective layer shields against environmental damage like corrosion or moisture, preserving surface integrity. A rubber coated magnet excels in industrial, automotive, or mounting tasks, offering reliable performance where surface protection and magnetic force are essential.

Magnetic Circuit Design in Rubber Coated Magnet

A rubber coated magnet consists of a ferromagnetic steel plate, Neodymium magnets, and a protective rubber casing, functioning similarly to pot magnets as magnetic holding assemblies. Rubber coated magnets excel with enhanced surface protection, superior corrosion and impact resistance, and increased friction, all thanks to its rubber casing. Unlike pot magnets, this casing creates a unique magnetic circuit within a rubber coated magnet, formed by Neodymium magnets—often disc-shaped—and a steel plate in an alternating pole arrangement. This circuit allows pull force optimization, tailored to specific needs. Additionally, the rubber material is precisely modified to complement the magnetic circuit, ensuring adaptability for diverse applications. From industrial fixtures to outdoor mounting, this design delivers reliable performance, meeting varied requirements with precision and durability across challenging environments.

Manufacturing Process of Rubber Coated Magnet

A rubber coated magnet’s casing not only protects the magnet from environmental damage and prevents surface scratches but also enhances slip resistance through friction between the rubber and working surface. While many manufacturers highlight a rubber coated magnet’s pull force and surface protection, they often neglect durability and the friction coefficient influenced by the rubber material.

The production of a rubber coated magnet starts with mounting disc magnets onto a ferromagnetic steel plate, followed by encapsulation using vulcanization or injection molding. Initially, vulcanization was standard, employing materials like ethylene propylene diene monomer (EPDM) for durability, nitrile butadiene rubber (NBR) for oil resistance, high-temperature vulcanized (HTV) silicone rubber, or fluorine rubber, which blends both benefits.

However, vulcanization’s lower efficiency and higher costs led to injection molding, where two molds are used: the first forms a rubber part with a cavity for the magnetic assembly, and the second injects another rubber part to encase and fuse with the initial piece. To match vulcanization’s durability and friction, thermoplastic vulcanizates (TPV) are used, though some manufacturers, prioritizing cost, opt for cheaper thermoplastic rubber (TPR) or elastomer (TPE), compromising quality. Customers must evaluate their application needs—whether requiring robust friction, durability, or chemical resistance—to select the right rubber material, ensuring optimal performance in diverse environments like industrial or outdoor settings.

Types of Rubber Coated Magnet

Rubber coated magnets typically come in three mounting variations: external threaded stud, internal threaded bushing, and internal thread, offering versatile installation options. A rubber coated magnet can also vary with additional accessories, expanding its adaptability. Beyond these standard round designs, SDM provides a rubber coated magnet in a rectangular form, featuring one or two internal threaded holes, catering to diverse industrial mounting needs with precision.

Rubber Coated Magnet with Internal Thread-Featured-2025

Rubber Coated Magnets with Internal Thread

Rubber Coated Magnet with Screw Socket-Featured-2025

Rubber Coated Magnets with Screw Socket

Rubber Coated Magnet with Threaded Stud-Featured-2025

Rubber Coated Magnets with Threaded Stud