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Properties of rubber magnets

by Jian Guo

Properties of rubber magnets

Rubber magnet is a common magnetic material, and its advantages are flexibility, plasticity, corrosion resistance and so on. Rubber magnets are widely used in various industrial, agricultural, medical, household and other fields. The performance of rubber magnets will be introduced in more depth below.

1. Magnetic ability:

A rubber magnet is a soft magnetic material, typically in the magnetic force range of 100 Gauss to 10,000 Gauss. The magnetic properties of rubber magnets are mainly determined by the oxide powder in its composition. The selection and particle size distribution of oxide powder will affect the performance of rubber magnets. Among them, oxide powders of minerals such as iron oxide and iron chromate are often used in the preparation of rubber magnets. In addition, the oxide powder of the rubber magnet can also be mixed with other materials such as barium ferrite, nylon, PVC, etc. to make composite materials to adjust the magnetic properties.

2. Plasticity:

Rubber magnet is a kind of plastic material, which can be made into magnets of different shapes and sizes by plastic technology, which is very convenient and easy to use. Rubber magnets have good flexibility and elasticity, and can be cut, shaped and processed according to requirements, and are suitable for making magnet products of various shapes and sizes. Rubber magnets can be manufactured by extrusion, injection molding, compression molding, etc.

3. Corrosion resistance:

Rubber magnets have good corrosion resistance and can be used for a long time in different environments. The oxide powder in the rubber magnet is usually wrapped in a polymer material, which reduces the contact between the oxide powder and the external environment. Rubber magnets can usually withstand the effects of chemicals, water, climate, etc., and are not easily damaged and corroded. But it should be noted that if it is suspended in the air for a long time, the rubber magnet may lose its magnetism due to the presence of acid-containing oxidizing gas.

4. Temperature stability:

The temperature stability of rubber magnets is usually limited, and the temperature range that can generally be tolerated is between -40°C and 150°C. Therefore, in practical applications, we need to choose rubber magnets with different temperatures according to their characteristics and use requirements. Alternating hot and cold environments may have a certain impact on rubber magnets, so it is necessary to choose a suitable rubber magnet according to the specific application to avoid possible temperature instability.

5. Mechanical properties:

Rubber magnets have good mechanical properties, and their main mechanical properties will be introduced in detail below.
Tensile properties:
The higher the tensile strength of the rubber magnet, the greater the tensile force it can withstand, and its basic tensile strength can be measured from a conventional static tensile test. The tensile strength of rubber magnets is usually between 3MPa and 8MPa.
Compression performance:
The greater the compressive strength of the rubber magnet, the more pressure it can withstand. The compression strength of rubber magnets is usually between 10MPa and 24MPa.
Bending properties:
The rubber magnet exhibits good flexibility and plasticity when bent and twisted, and will not crack or break. The bending strength of the rubber magnet is usually between 20MPa and 50MPa.

Shear performance:
The rubber magnet has high shear strength, can withstand large shear force, and is not easy to break. The shear strength of rubber magnets is usually between 15MPa and 30MPa.
Fatigue performance:
The fatigue performance of rubber magnets can directly affect its long-term service life. Most rubber magnets require fatigue experiments under cyclic loading to study their fatigue properties. Normally, the fatigue life of rubber magnets will gradually decrease with the increase of load intensity.
It should be noted that although rubber magnets exhibit high mechanical properties in most cases, they are still flexible, and relatively brittle and hard materials will be more easily compressed or sheared. Therefore, it is necessary to carefully understand the use environment and load of the rubber magnet before application, so as to formulate a reasonable use plan and select the appropriate rubber magnet model.

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