EMI/RFI Shielded Rigid Frame Gasket
EMI/RFI knitted wire gasketing has been the standard shielding product since its first use in 1944. Since that time, the product has been refined and new knit wire products have been introduced to the present state of the art products.
Rigid Mount Frame EMI/RFI Gaskets consist of an aluminum extrusion with a specially designed jaw. When closed, the jaw crimps the fin of the knit wire EMI gasket to form a rigid construction with the EMI gasket held firmly in place. This extrusion, when fabricated into a frame with the corners of aluminum extrusion mitered and heliarc welded, provided a gasket assembly that can be installed with flat-head screws. This design makes retrofitting int the field a relatively easy task and at the same time provides a positive stop for controlled compression of the EMI Gasket.
Rigid frame gasket is especially recommended for large cabinet doors or access panels that are frequently opened. Knit wire gasketing acts like thousands of tiny spring members which are compressed and released with each opening and closing of a cabinet door or enclosure cover. The spring-lock gaskets assure long life with consistent point-to-point contact, providing high shielding effectiveness and long life.
For applications requiring a moisture seal, an elastomer strip can be bonded to the edge of the extrusion opposite the gasket.
An added barrier to EMI/RFI interference can be achieved by utilizing a double-shielded construction. The double-shielded gasket is recommended for large doors where controlling the mating surface joint unevenness can be difficult and expensive. A further consideration for utilizing the rigid frame approach is the load bearing support of extruded aluminum which aids in applications where shock and vibration are encountered.
Standard knit wire mesh is available in either monel, tin-plated ferrous, or knit mesh with elastomer core of neoprene or silicone sponge.
The highest possible attenuation levels are achievable with EMI/RFI knitted wire gasketing. Attenuation levels beyond 110 dB int eh E-Field and 65 dB in the H-Field are common. Higher levels of attenuation are attainable with special materials and special design. Contact our sales engineers for additional information.