At KRA Fabrication, we’re backed by decades of industry experience to help us guide you toward the most cost-efficient, easily-fabricable product on the market. When the joining of surfaces during the EMI shielding process can, at times, introduce gaps into the shielding coverage, our experts help you choose the best solution for your project.
The newest in technology,
our metallic-particle-filled gaskets, are able to combine the sealing properties needed with the electrical properties of metals, making them a top choice for EMI shielding gaskets. These filled gaskets are able to ensure both effective EMI shielding and electrical conductivity.
Although you’ll find different kinds of gaskets depending on material design and geometry, the essential varieties include metal spring fingers, knitted wire mesh, fabric shielding gaskets (FSG), particle-filled silicone gaskets, and form-in-place (FIP) gaskets.
Finding the right gasket
Each of these gaskets are comprised of materials with individual benefits and are suitable for a specific application. KRA Fabrication works with you to factor in a number of variables when selecting the right gasket, including:
- Compression forces
- Material compatibility
- Corrosion control
- Compression set
- Shielding performance
- Compression range
- Environmental sealing.
Types of EMI Gaskets
Metal RF Spring Finger Gaskets
Metal gaskets are made from a variety of materials and are known for their high shielding performance and significant physical compression range. Copper Beryllium has excellent spring and conductive properties and is often chosen for applications.
Knitted Wire Mesh Gaskets
These gaskets are designed from a range of metal wires such as tin-plated copper-clad steel, monel, and aluminum. They are ideal for low-cycle applications because they are very cost-effective, yet are outstanding for an array of frequency ranges.
The gaskets come with a knitted construction and a range of shapes and sizes, offering enduring resilience with flexible mounting options. The conductive knit materials provide high-impact EMI shielding along with a soft, smooth surface.
With knitted mesh, you get outstanding resilience for point-to-point and uniform contact that requires minimum compression force.
Integrated Gasket Solutions
Fabric Shielding Gaskets/Fabric Over Foam
This gasket construction offers very low closure force with good shielding attenuation and conductivity. They are perfect for applications that need low compression force. One ideal application for these gaskets is in the grounding or shielding of medical electronic equipment apertures and seams. These gaskets come in multiple shapes, sizes, and thickness to meet your design requirements.
Particle-Filled Silicone Gaskets
These gaskets provide electrical conductivity and environmental sealing while shielding EMI emissions. The gaskets keep emissions from being radiated by the electronics of the device and protect the circuit from outside interference.
As an example, some touchscreens designed for use in extreme desert, arctic or marine environments have gaskets made of metallic-particle-filled silicones. Filled silicone gaskets are soft enough to avoid interfering with the touchscreen function but strong enough to cushion the device from mechanical shock.
Form-in-place EMI Gaskets are ideal for today’s densely populated electronics packaging. This is particularly true where inter-compartmental isolation is required to separate processing and signal generating functions.
These directly-dispensed gaskets provide excellent electrical contact when mating conductive surfaces, including printed circuit board traces. This system is widely used in compartmentalized enclosures and other tightly packaged electronic devices in military, telecom, transportation, aerospace, and life science applications.
With software-driven gasket dispensing, our technology is ideal for rapid prototyping, changes in design, and production scale-up. Its inherent flexibility accommodates batch runs or continuous production, from in quantities of one to millions of parts.
Form-in-place gasketing technology allows dispensing of precisely positioned, conformable gaskets in very small cross-sections that free valuable package space. They provide the lowest total cost of ownership for small cross-section and complex pattern applications.
EPDM Rubber Gaskets
EPDM (Ethylene Propylene Diene Monomer) rubber gaskets are KRA Fab’s custom rubber gaskets of exceptional quality and reliability. EPDM has many of the characteristics typical of conventional elastomers, such as tear resistance, a high tensile strength, and a low compression set.
The unique property of EPDM, however, is its resistance to degradation from weathering agents like UV rays and ozone. In addition to this, it is also very resistant to polar substances and steam. These rubber gaskets have the following benefits:
- Excellent resistance to ozone, sun, and oxygen
- Excellent resistance to acids, alkali, and ketones
- Excellent heat resistance and aging
- Overall temperature range of -67°F to 302°F (-55°C to 150°C)
- Good electrical insulation properties
K.R. Anderson’s EMI gasketing technology, combined with proper metal or conductive plastic housing, provides an integrated solution ready for the customers’ highest level of assembly.