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Dongguan Minz Rubber & Plastics Co., Ltd.

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What are the performance considerations for choosing silicone seals?

Release time:

2019-05-16 12:30

Source:

What are the performance considerations for choosing silicone seals?
 
When our silicone sealing ring company chooses rubber silicone sealing ring, the first performance to be considered mainly includes its tensile strength, constant elongation stress, elongation at break, tear deformation, and strain curve. We collectively call it tensile strength.
 
However, the tensile strength is the tensile stress when the sample is stretched to break. The constant elongation stress (constant elongation modulus) is the stress reached at a specified elongation. Elongation is the deformation of the specimen caused by tensile stress, expressed as a percentage of the ratio of the elongation increment to the original length. The elongation at break is the elongation of the sample at break.
 
The tearing deformation of the sealing ring is the residual deformation of the gauge part after the tensile fracture of the specimen. The rubber specification is a polymer material with high stretchability and elasticity. The rubber sealing ring is characterized first of all by a very small elastic modulus and a high elongation. The second is that it has quite good resistance to air permeability and resistance to various chemical media and electrical insulation. Secondly, we consider the basic performance of silicone sealing ring-hardness.
 
The so-called hardness is the ability of rubber to resist the invasion of external pressure. The hardness of rubber is related to some properties to a certain extent. For example, the higher the hardness of the rubber, the greater the strength, the smaller the elongation, the better the wear resistance, and the poorer the low temperature resistance. High hardness rubber can resist extrusion damage under high pressure. Therefore, the appropriate hardness should be selected according to the working characteristics of the parts. Silicone sealing ring is often in a state of compression, so we have to consider the compression performance of silicone sealing ring.
 
Due to the viscoelasticity of the rubber sealing ring material, the compression stress will decrease with time after the rubber is compressed, which is manifested as compression stress; after the pressure is removed, the original shape cannot be restored, which is manifested as compression deformation. These phenomena are more pronounced in high temperature and oil media. They will affect the sealing performance of silicone sealing ring, is one of the important properties of silicone sealing ring rubber. Some special synthetic rubber has good oil resistance and temperature resistance, can resist the swelling of fatty oil, lubricating oil, hydraulic oil, fuel oil and solvent oil; cold resistance can be as low as -60 ℃ to -80 ℃, heat resistance can be as high as 180 ℃ to 350 ℃.
 
Rubber is also resistant to various bending, bending deformation, because the hysteresis loss is small. Commonly used is the brittleness temperature, which refers to the temperature at which the specimen breaks when subjected to a certain impact force at low temperature, which can be used to compare the low temperature performance of different rubber materials. However, because the working state of the rubber parts is different from the test conditions, the brittleness temperature of the rubber material does not indicate the working temperature of the sealing ring, especially in the oil medium.
In the material standard, we generally use TR10 as an indicator, which is close to the brittleness temperature of rubber. Another method of low temperature performance of silicone seal ring is to determine its cold resistance coefficient. Generally, the sample is compressed to a certain amount of deformation at room temperature, then frozen at a specified low temperature, and then the load is removed to allow it to recover at low temperature. The ratio of recovery to compression is called compression cold resistance coefficient. The larger the coefficient, the better the cold resistance of the rubber seal ring.
 
Most of the silicone seal ring is to survive in the fuel, lubricating oil, hydraulic oil and other systems, so often contact with a variety of oil, the living environment is bad, naturally also need it to have oil resistance. The sealing ring in the oil medium, especially at higher temperatures, will cause, expand and reduce the strength and hardness. At the same time, the plasticizer or soluble substances in the rubber may be leached by the oil, resulting in weight reduction, volume reduction, and leakage.
 
It can be seen that the oil resistance of the sealing ring is an important performance of the rubber material working in the oil medium. Therefore, the weight change, volume change, strength, elongation and hardness change are measured after immersion in oil for a certain period of time at a certain temperature. For sealing, even under adverse working conditions, industrial shaft silicone seals should cause friction and wear. Each design and material combination has its own specific characteristics and is suitable for a specific application.

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What is the difference between silicone plug and rubber plug

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The convenience of the use of industrial silicone buttons

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What are the molding techniques of rubber products?

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How to print the pattern on the transparent key

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