China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Rubber magnets, also known as soft magnets or magnetic rubber, are composite magnets formed by mixing ferrite magnetic powder with rubber materials through calendering or injection molding. Today we'll discuss how their magnetic properties weaken over time.
First, the rubber matrix in magnetic rubber undergoes aging during prolonged use. Under the influence of environmental factors such as oxygen, ultraviolet light, temperature, and humidity, chemical reactions like molecular chain breakage and cross-linking occur within the rubber molecules. This alters the rubber's properties, gradually loosening its internal structure and affecting the distribution of magnetic phases within the matrix. Consequently, the magnetic properties weaken.
Flexible Rubber Ferrite Soft Magnetic Material
Regarding temperature, if rubber magnets are exposed to prolonged high temperatures, the magnetic domain structure within the magnetic phase will undergo changes. This leads to a decrease in the orderliness of magnetic domains, thereby weakening magnetic properties. In low-temperature environments, rubber magnets become hard and brittle, reducing the elasticity and flexibility of the rubber matrix. This may alter the interactions between particles in the magnetic phase, also affecting magnetic properties and causing varying degrees of magnetic weakening.
If rubber magnets are exposed to strong external magnetic fields for extended periods, and the direction of these external fields conflicts with the magnetization direction of the rubber magnets themselves, it may cause the magnetic domain structure within the rubber magnets to rearrange. This rearrangement can lead to a weakening of their inherent magnetic properties. Additionally, frequent exposure to alternating magnetic fields can induce hysteresis losses and eddy current losses within the rubber magnets. These losses consume magnetic field energy, resulting in a gradual decline in magnetic strength over time.
During use, if the rubber magnet is frequently subjected to mechanical stresses such as stretching, compression, or bending, the bonding strength between the rubber matrix and the magnetic phase may be compromised. This can lead to changes in the distribution of magnetic phase particles or even their detachment, resulting in a reduction of magnetic properties.
If the rubber magnet is exposed to corrosive gases, liquids, or other chemicals in its environment, these substances may react chemically with the magnet's components. This reaction can erode the magnetic phase or disrupt the bond between the rubber matrix and the magnetic phase, leading to a decline in magnetic properties.
The above are some reasons for the weakening of the magnetic properties of rubber magnets. Under normal temperature, pressure, and without strong external magnetic fields, the magnetic properties of rubber magnets usually remain stable for several years.
Other articles on rubber magnets on the website;
Processing of Flexible Rubber Magnetic Strips