Magnetic system holds its magnetic strength best during most of the magnetic flux is granted the ability to loop through ferromagnetic medium instead of air. Magnetic system in rubber coated magnet will form a magnetic circuit with ferromagnetic load after stuck to each other. Take the pull force of A43 as an example, simulation results of practical and expected arrangement reached 123.0N and 78.7N, respectively. With the same cost, practical arrangement utilizing sintered Neodymium magnets with opposite poles right next to each other exhibit much stronger pull force in comparison with the expected arrangement.

Encapsulation process of rubber coated magnet is processed via vulcanization or injection molding technology. Vulcanization and injection molding technology is corresponding to vulcanized silicon rubber and thermo-plastic-rubber material (TPR), respectively. Injection molding technology of rubber coated magnet is belonging to overmolding process which involves 2 separate molds. The first mold produces a rubber part with cavity for the magnetic system. Magnetic system is then placed into the first rubber part. The assembly is subsequently inserted into the second mold where the second half of rubber part in injected, covering the magnetic system and fusing with the first half of the rubber part. For rubber coated magnet, injection molding technology is the more conventional encapsulation process compared with vulcanization technology due to the production efficiency, raw material cost, utilization rate of recycled material, and color flexibility. Even vulcanization technology is generally condemned for relatively higher cost, but vulcanized silicon rubber coating can serve more superior durability and slide resistance to rubber coated magnet.