Parker launches CHO-SEAL EMI Shielding Gasket
The Chomerics Division of Parker Hannifin Corporation, the global specialist in motion and control technologies, has introduced a new low-durometer EMI shielding gasket for use in both military and commercial electronics applications. CHO-SEAL 1299 is said to offer a lower hardness (only 45 Shore A typical) than many traditional conductive elastomer gaskets while still providing highly effective shielding and corrosion resistance against aluminium.
CHO-SEAL 1299 is an electrically conductive EMI shielding elastomer gasket consisting of passivated silver-plated aluminium particles in a fluorosilicone binder. The new material offers a higher temperature limit than most conductive fluorosilicones (up to 200°C continuous use) and is resistant to harsh chemicals such as machining coolant, hydraulic fluids, mineral oils and various fuels.
While the legacy CHO-SEAL 1298 is among Chomerics’ most trusted products, the material needs more force to compress than certain applications can provide. Parker developed CHO-SEAL 1299 to provide customers with the same performance they trust in a softer form.
At only 45 Shore A hardness (35 per cent softer than CHO-SEAL 1298), the low compression force of CHO-SEAL 1299 makes it suitable for EMI shielding applications that include military communication modules, unmanned aerial vehicles (UAVs), naval and shipboard electronics, portable electronics and robotics equipment.
Providing protection against the ingress of dust, moisture and more, the new RoHS-compliant material is described by Parker as “groundbreaking for the many electronic device applications that require design flexibility without compromising EMI shielding effectiveness”.
One common use case is connector interface seals. In smaller connectors, it can be especially difficult to compress a conductive elastomer material by even small amounts because of the high force necessary. Access to a softer material will benefit customers who have encountered a similar challenge.
As an electrically conductive fluorosilicone elastomer, CHO-SEALÂ 1299 provides great EMI shielding across a broad frequency spectrum. For example, according to the MIL-DTL-83528 test method (para 4.5.12), the new EMI gasket material delivers a minimum shielding effectiveness of: 128 dB at 100 MHz (E field); 102 dB at 500 MHz (E field); 110 at 2 GHz (plane wave); 122 dB at 10 GHz (plane wave); and 94 dB at 18 GHz (plane wave).
While the legacy version offers an elongation of 60 per cent, CHO-SEAL 1299 can provide 100 per cent according to the ASTM D412 test method. Superior elongation supports greater flexibility and ductility, permitting the new material to conform to irregular surfaces and resist deformation without fracturing. This capability is vital for maintaining an effective seal and shielding against EMI and makes the gasket easier to install.
CHO-SEALÂ 1299 is available in moulded format, including O-rings, D-rings or custom-moulded shapes. Parker Chomerics also provides the new material in sheet format for cut gaskets. Sheet stock can be die-cut using a steel rule, X-Y knife cut or water-jet cut (non-abrasive) to make precision parts in large quantities. If required, sheet stock can be provided with an electrically conductive, pressure-sensitive acrylic adhesive (PSA) to aid the assembly process. In addition, CHO-SEALÂ 1299 will soon be available in extruded profiles.
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