Nickel Graphite Conductive Fillers Assure Corrosion Resistance in Severe EnvironmentsE-Fill™ nickel graphite powder from Sulzer Metco is a conductive filler used in the formulation of raw material for EMI gaskets and seals. Ni graphite powders are polymer additives that are usually combined with silicone to form electrically conductive elastomers. These nickel graphite conductive fillers give EMI gaskets shielding capabilities comparable to that of silver conductive filler additives over a wide frequency range. The nickel graphite’s angular shape combined with a proprietary highly conductive hard nickel coating gives the gasket material the “bite” needed to ensure the best electrically conductive seal for enhancing EMI and RFI shielding. E-Fill™ nickel graphite fillers are aluminum compatible and offer enhanced galvanic corrosion resistance and stability in severe environments. Learn more about E-Fill at the Sulzer Metco website.Gel Shielding Gaskets Safeguard Against High-Energy EMIThe series of dBseal GelShielding gaskets from Dow Corning are based on Geltek material technology and provide shielding and effective grounding of high energy electromagnetic interference (EMI). Extensive laboratory testing in salt fog and fluid resistance has shown that dBseal gel gaskets provide an effective barrier against corrosion. This patented product made of soft silicone or fluorosilicone gel material conforms to irregular surfaces to protect them from corrosive elements. These gaskets consist of a woven Monel wire cloth (30 or 60 mesh) that is impregnated with a high-performance silicone, or fluorosilicone gel for applications that require resistance to solvents and fuels. The conductive Monel cloth is an alloy of nickel and copper, which conforms to material specification QQ-N-281 class A, or AMS-4730. These gaskets can be cold applied without any special tools or cure time; gaskets are precision cut and are supplied with protective release films. Additional information on these gaskets can be found on the Dow Corning website.“Supershield” Provides Both EMI and Environmental ProtectionThe 1000 Series Supershields from Tech-Etch is a silicone elastomer filled with conductive metal particles that provide high EMI shielding effectiveness and an environmental seal. The Supershield family uses eight basic shielding media: Supershield 100 with carbon; Supershield 200 with nickel graphite; Supershield 300 with silver (low density); Supershield 400 with silver nickel; Supershield 500 with silver aluminum; Supershield 600 with silver-plated glass; Supershield 700 with pure silver; and Supershield 800 with silver-plated copper. Supershield can be supplied in a variety of sheet sizes, standard extrusion sections, or as standard or custom die-cut gaskets. For more information, go to the Tech-Etch website.Wire Oriented Silicone Series Targets Industrial, Military, and Commercial ApplicationsThe 150 Series gaskets and gasketing material from East Coast Shielding are a combination EMI shield and an environmental and pressure seal. East Coast Shielding wire oriented silicone is fabricated from individual wires in a silicone solid or silicone sponge elastomer. The wire provides the EMI shielding and the elastomer provides the environmental and pressure seal. Each individual wire is oriented perpendicular to the flange mating surface and is crimped to ensure proper contact. This wire oriented silicone gasketing is recommended for use in industrial, military and commercial applications requiring EMI shielding and environmental sealing with a low to moderate closure force. Wire oriented silicone with the silicone sponge elastomer is designed for applications which have severe joint unevenness, require low closure forces, have a 5 PSI maximum operating pressure, and require a greater compressibility than silicone solid. Wire oriented silicone with the silicone solid elastomer is designed for applications requiring moderate closure forces, high operating pressures, and a wider temperature range. For operating pressures up to 250 PSI, wire oriented silicone strips are available with the wire contained in 0.25″ of the width of the silicone solid elastomer. Look for additional information on this gasketing at the East Coast Shielding website.Three-Axis Robot Dispenses Conductive Elastomer ShieldingA Form-In-Place process announced by Die-Cut Technologies is an automated system for dispensing conductive elastomer shielding, grounding, environmental gaskets, and adhesives onto metal or plastic substrates. Gaskets can be dispensed onto any conductive painted, plated or metallic surface of an electronic enclosure to protect it internally from radiated interference and environmental elements. This economical process consists of a fully programmable three-axis robot that allows a bead of silicone, urethane or adhesive to be dispensed precisely onto small areas or into grooves directly onto the hardware. The system and compounds are suitable for applications on metal or plastic. This system is suitable for both prototypes and production volumes. It is especially well suited to use on small diameter sections where handling of traditional gaskets is difficult and expensive. For more on Form-in-Place, go to the Die-Cut Technologies’ website.Gasketing Material Available in Both Solid and Sponge SiliconeSeries 600 gasketing material from SAS Industries is produced from the combination of specification grade silicone and wires used in sheet and strip form. The silicone elastomer acts as an environmental seal, while the wires provide excellent conductivity to establish EMI/RFI integrity. The material is available in both solid and sponge silicone, and with aluminum or monel wires. Custom composites are available on request. A proportioned Strip is used when corrosion may be of great concern and when compressive force available may be minimal. Wires are oriented in only .25 of the total width of the gasketing material. The balance of the width creates the environmental seal while the middle portion with wire provides the EMI seal. Learn more at the SAS Industrieswebsite.
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