What are the reasons that affect the poor sealing performance of silicone encapsulated precision parts?

There are various reasons that can affect the poor sealing performance of silicone encapsulated precision parts, which may involve multiple aspects such as materials, design, manufacturing, assembly, and use. The following is a detailed analysis of these reasons:


Firstly, material selection is crucial for the sealing performance of silicone encapsulated precision components. If the selected silicone material has poor compatibility with the substrate, or its performance is unstable under different temperatures, humidity, and chemical environments, it may lead to a decrease in sealing performance. In addition, the adhesion force of silicone is also a key factor affecting the sealing effect. If the adhesion of silicone is insufficient and it is difficult to tightly bond with the substrate, then the sealing performance will naturally be affected.


Secondly, the impact of product structural design on sealing cannot be ignored. In the early stages of development, if the dimensional interference of the product is not fully considered, it may lead to dimensional deviations during the machining process. Due to the fact that silicone products belong to soft colloids, there may be issues with mismatched outer or inner wall assembly of the plug structure during assembly. If the peripheral size is too large or too small, or the inner wall diameter is set improperly, it may cause the plug to not fit tightly with the main component, thereby affecting the sealing performance.

Moreover, the process control in the manufacturing process is also an important factor affecting the tightness. If the molding temperature, vulcanization time and other parameters are set improperly, it may cause the silicone to be unable to fully vulcanize or flow, thus affecting the close combination with the substrate. In addition, the cleaning and treatment of the surface of the hardware is also crucial. If there is oil, dust and other impurities on the surface, it will reduce the adhesion between the silicone and the hardware, and then affect the sealing effect. In addition, the operation during the assembly process is also a key link that affects the tightness. If the assembly force is too tight or too loose, it may lead to deformation or damage of the silicone seal. At the same time, the incorrect installation position may also cause the seal to be in a state of excessive pressure or tension, and then crack or fall off. In addition, human factors may also lead to assembly anomalies, such as long-term force compression, tensile distortion, etc., which may reduce the sealing performance. Finally, the use of the environment and conditions of use will also affect the tightness of the silicone coated precision parts. For example, certain media may be corrosive to silicone seals, leading to material deterioration, expansion, dissolution or corrosion, thereby reducing the sealing performance. At the same time, long-term exposure to environmental factors such as oxidation and ultraviolet radiation may also lead to aging of silica gel materials, hardening, brittleness or softening and other problems, thus affecting the sealing effect. In summary, the reasons for the poor sealing of silicone rubber coated precision parts are various, involving many aspects such as materials, design, manufacturing, assembly and use. Therefore, in actual production, it is necessary to fully consider these factors, and take appropriate measures to ensure that the sealing performance of silicone coated precision parts meets the requirements. For example, you can choose silicone materials with good elasticity and aging resistance, optimize product structure design to ensure size matching, strictly control the manufacturing process and assembly process, and pay attention to maintenance and maintenance during use.