Consideration for EMI Gasket Design

What are the most important things to consider when using EMI Gaskets? Most electrical engineers must navigate between gasket materials and the design of equipment enclosures. Modern design calls for durability and lightweight design, which means that plastic and aluminum are frequently used. Although these materials are ideal for strength and weight, they have problems withstanding distortions that are a result of compression from EMI shielding. Robust enclosures can be built out of a wide variety of materials that are perfect for gasketing. Reinforced flanges can permit higher compressive forces when limit stops are fitted. Gaskets allow for environmental seals of IP55 or higher, which is essential when working with EMI.

When it comes to using gaskets, there are certain things individuals should keep in mind:

1. All mating surfaces must be flat, smooth, conductive, dry, and clean. Do not apply to parts that have paint, oil, preservatives, or grease.
2. Ideally, fixings are placed outside the shielded envelope. Special attention must be paid to the bolts and screws that pass through enclosures—for securing cover plates.
3. Gasket materials should closely match the hardness of the EMI shield they are working within.
4. When possible, avoid knife edges.
5. Gasket materials should be selected based on the environment in which they will work. For instance, fluorosilicone rubber is a better choice than plain silicone for dealing with hydrocarbon contamination.
6. Gaskets materials should also be based on the temperature ranges that they are likely to encounter.
7. Over-engineering can cost you unnecessary money. The most costly materials are not always the best for the job. Our team can help you determine the best materials to ensure you stay under budget.
8. Always consider the potential effects of Galvanic corrosions.

shielding gasket

There are many things to consider when creating and using EMI shields and EMI gaskets. Our team of engineers can help you walk-through your needs so that we can create the best solutions for your specific design and applications.

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