Coated foam-core and elastomer gaskets

EMI/EMC Gaskets: Comparison Between Jacketed Foam-Core Gaskets and Conductive Elastomer Gaskets

In all electronic applications, electromagnetic compatibility (EMC) is a key consideration. To minimize electromagnetic interference (EMI) and ensure reliable device operation, specialized gaskets are used. Two common types are jacketed foam-core EMC gaskets and conductive elastomer EMC gaskets. Below is an overview of both options:

Jacketed Foam-Core EMC Gaskets

These gaskets consist of a foam core (PU, neoprene, EPDM, etc.) that is jacketed with either metal mesh or a conductive textile. The foam provides a flexible, pressure-compensating seal, while the conductive jacket effectively shields against electromagnetic interference.

Advantages:

Flexibility: Ideal for uneven surfaces and complex geometries.

Easy installation: Simple to handle and adapt; often supplied with adhesive backing.

Good sealing performance: Provides a reliable barrier against EMI.

Lightweight: Especially beneficial in applications where weight matters.

Disadvantages:

Weather resistance: May lose performance after prolonged exposure to moisture or UV radiation.

Long-term stability: The foam can lose elasticity over time.

Conductive Elastomer EMC Gaskets

These gaskets are made from electrically conductive elastomer, combining elasticity and conductivity in a single material. They are commonly available as extruded profiles or die-cut sheets and provide durable, long-term EMC shielding.

Advantages:

High resistance: Excellent resistance to weathering, chemicals, and UV radiation.

Durability: Maintains its properties over long periods of time.

Strong mechanical properties: Provides reliable sealing against dust, water, and electromagnetic interference.

Disadvantages:

Less flexible: Not as suitable for irregular surfaces.

Installation: May require specialized mounting or fastening methods.

Cost: Can be more expensive to purchase.

Conclusion

The choice between jacketed foam-core EMC gaskets and conductive elastomer EMC gaskets strongly depends on the requirements of the specific application. If flexibility and quick, easy assembly are the main priorities, jacketed foam gaskets are a solid choice. For applications requiring high weather resistance and long-term durability, conductive elastomer EMC gaskets are often the better option.