Any material that is both conductive and elastic can be used as an electromagnetic shielding gasket. Therefore, many types of electromagnetic sealing gaskets can be seen on the market. These electromagnetic sealing gaskets have their own characteristics and are suitable for different applications.
Designers should be familiar with the characteristics of various electromagnetic sealing gaskets, and flexibly select them in the design to meet product performance requirements, improve product reliability, and reduce product costs.
Shielding effectiveness: The overall shielding effectiveness is determined according to the interference spectrum that needs to be suppressed, and the electromagnetic sealing gasket must meet the overall shielding requirements. Different types of gaskets have different shielding effectiveness at different frequencies.
Use environment: One of the main reasons why there are so many types of electromagnetic sealing gaskets is to meet the requirements of different environments. The use environment has a great impact on the performance and life of the gasket.
Structural requirements: The main function of the gasket is to reduce the leakage of the gap, and the structural design of the gap has a great influence on the effect of the gasket. When designing a structure, there are several factors to consider:
Compression deformation: Electromagnetic sealing gaskets only work when subjected to a certain pressure. Under the action of pressure, the liner deforms, and the amount of deformation is proportional to the pressure on the liner. Most gaskets need to be deformed by 30~40% to have a good shielding effect.
Compression set: When the pad is under pressure for a long time, even if the pressure is removed, it cannot fully return to its original shape, which is the compression set. This characteristic is of particular concern when gaskets are frequently compressed and decompressed (such as doors and removable panels).
Electrical stability: Electromagnetic shielding gaskets achieve the purpose of shielding by providing a low-impedance conductive path between metals. Therefore, its electrical stability is very important to maintain the shielding effectiveness of the shield.
Installation Cost: The method of installation of the electromagnetic gasket is a major factor in determining shielding cost. The cost of the liner includes the cost of the liner itself, the cost of installation man-hours, and the cost of processing. These factors should be considered together when considering the cost of the pad.