misc

Cho Bond Adhesive

DESCRIPTION: Single- and two-component epoxy and silicone adhesives, with room temperature, elevated temperature or moisture cure mechanisms.

EPOXIES FOR MICROELECTRONICS: Parker Chomerics' growing family of conductive epoxies now includes one-part, silver-filled pastes formulated for today's optoelectronic and microelectronic assembly applications. .
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CHO-BOND-SEALANTS-AND-CAULK

DESCRIPTION: Fill cracks and large gaps with a choice of single-component, non-hardening systems, or two-component curing systems.
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Cho Button

DESCRIPTION:CHO-BUTTON grounding contacts provide a reliable RF bond between metallic parts of an enclosure (side panels- to-frame, door-to-frame, etc.). When spaced at 4 to 8 inch intervals, the shielding effectiveness obtained is greater than 40 dB for emissions below 200 MHz. This level of shielding is normally adequate to meet commercial EMI specifications for digital devices operating below 50 MHz.
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Cho Drop

DESCRIPTION: CHO-DROP EMI absorbers are discrete components designed to reduce radiation from digital signal lines without significantly adding to propagation delay. They will normally suppress radiation from a given lead by 10-15 dB, and have a propagation delay of less than 10 nanoseconds. Placed in series with a signal line, these devices will suppress EMI emission without grounding, shielding or by- pass capacitors. They are supplied in reels for use with automatic insertion equipment. As a suppressor for unshielded cables, CHO-DROP absorbers should be put in series with each connector lead, including ground leads. To suppress radiation from a clock, place in series with a clock lead near the output of the clock driver. Undesired signals appearing at the power supply input may be reduced with a CHO-DROP absorber between the power supply output and the PCB.

Features:
• Flat absorption characteristics means no ringing (unlike ferrite beads)
• No grounding or shielding required
• DB insertion loss from 50-200 MHz
• Will not affect signal transmission
• Cost effective
• Supplied on reels for automatic insertion
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Cho Flex

DESCRIPTION:• CHO-FLEX 601 coating is specifically designed for EMI shielding of copper/Kapton flexible circuit laminates and for printing circuits on Kapton film. Upon cure, this coating exhibits excellent adhesion and flexibility, thermal stability, high conductivity and superior peel strength. It can be sprayed or silkscreened, and will withstand wave solder temperatures above 500°F (260°C) without losing any of its exceptional properties.

• CHO-FLEX 4430 polyester ink was developed for the membrane keyboard and sensor industries. It bonds to Mylar† films, and can be creased, heat-formed or scratched without affecting its performance. Pure silverfilled CHO-FLEX 4430 ink offers surface resistivity of 0.050 ohm/square at 0.0005 inch (0.013 mm) thickness..
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Cho Jac

DESCRIPTION:CHO-JAC® shielding is a high quality, flat cable jacket designed to attenuate RF signals and bring digital electronic devices into EMC compliance at an attractive cost. This lightweight, flexible jacket is designed with a 360-degree aluminum or copper shield bonded with a metal overlap to a polyester layer. Metal-to-metal contact is established as the jacket wrap is  completed. This design provides the maximum EMI shielding when properly sealed and terminated. Integral wires simplify folding and termination, and provide crack resistance. CHO-JAC shielding passes the flame retardancy requirements of UL specification 94V-0.
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Cho Shield Coating

DESCRIPTION: Epoxy Coatings CHO-SHIELD epoxy coatings provide EMI shielding, anti-static protection, corona shielding and surface grounding in a wide range of applications.

• CHO-SHIELD 596 coatings are twocomponent, silver-filled systems possessing exceptionally
high conductivity and generally providing EMI shielding levels of up to 60-80 dB in the 30 MHz to 1 GHz range. They can be applied with a brush or conventional spray equipment. Both offer excellent EMI and environmental protection when applied to glass, plastic or epoxy substrates. They cure at room temperature, although optimum results are achieved with elevated temperature.

• CHO-SHIELD 610 is a highly conductive, two-component silver-platedcopper filled epoxy coating for application to non-conductive plastic substrates, particularly those subject to hostile environmental conditions of abrasion, temperature extremes, high humidity, and salt fog corrosion. It dries to the touch in less than one hour, with best performance attained by using one of two accelerated cure cycles.
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Cho Sorb

DESCRIPTION:Cost-effective CHO-SORB® EMI ferrites reduce conducted emissions on signal lines and power cables without affecting data transmission. Chomerics' CHO-SORB ferrite attenuators allow desired signals to pass through cables or circuits while absorbing extraneous and unwanted energy. Low frequency and DC see only the conductor and are unimpeded. CHO-SORB attenuators reduce EMI for compliance with FCC, EC, VDE, and CISPR 22 limits. They install easily with no grounding required. Many configurations are available from Chomerics and through our authorized distributors.
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Conductive Spray Coating

DESCRIPTION:Chomerics operates full-service facilities for the application of conductive coatings to our customers’ plastic housings. Available as a stand-alone service, this operation is fully integrated with our Cho-Form® automated gasket dispensing operations. As a result, it provides a major logistical advantage that saves time and cost by minimizing part handling and eliminating unnecessary shipments.
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Conductive Thermoplastic

DESCRIPTION: PREMIER™ is the world’s first commercially available conductive thermoplastic for real world EMI shielding solutions. It is a blend of PC/ABS thermoplastic polymer alloys and conductive fillers engineered for stable electrical, mechanical, and physical performance. The conductive filler technology utilizes nickel plated carbon (Ni-C) fibers as the base filler. In the case of higher shielding versions, Nickel-Graphite (Ni-C) powder is blended with the fiber base to deliver enhanced performance. Combined with standard injection molding processes, PREMIER technology delivers evenly dispersed filler throughout a part’s geometry. PREMIER parts have no resin rich areas prone to EMI leaks, and no brittle, resin poor areas that can break under mechanical stress. PREMIER provides world class shielding effectiveness, requires no machining, plating, painting, vacuum coating, or other added processing steps. The elimination of secondary operations can reduce costs by up to 50% compared to die castings, bent formed metal, machined extrusions and plated plastic parts.
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EMI Laminates

DESCRIPTION: Mechanical, electrical and processing properties, plus economy for commercial
applications. Chomerics produces a growing family of specialty laminated materials for EMI shielding. These laminates are available in bulk rolls for customizing into EMI shields, ground planes, ground straps, shadow shields, ESD shields and a host of other electronics applications. EMI shielding performance exceeds that of conductive coatings when properly designed. Laminates provide an environmentally friendly solution that eliminates solvents, conductive paints, or plating processes. With their thin cross sections and light weight, EMI shielding laminates are also a space saving solution.
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EMI Missile Cannister Seals

DESCRIPTION: Chomerics’ missile canister seals combine specialized foil/film laminates with molded conductive and non-conductive rubber seals. We offer the expert design, materials knowledge, manufacturing engineering and process control necessary to produce these sophisticated assemblies. Our experience in building complex, multi-functional designs that meet military specifications, together with our QS-9000 certified facilities in Hudson, NH, ensures a quality product from concept to manufacture.

Lamination expertise enables us to achieve the clean fly- through and blow-out characteristics required for missile canister seals. In addition, Chomerics applies its unique strength in molding both electrically conductive elastomers for EMI shielding and non-conductive environmental seals to a variety of substrates. For these applications, we mold either silicone or fluorosilicone to metals, plastics and/or foils. In-house compounding of the elastomeric materials ensures consistency and specification compliance. Canister seal assemblies include metal frames which provide mounting locations in addition to structural integrity. We offer in-house CNC machining capabilities as well.
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GP70

DESCRIPTION: EmiClare GP 70 EMI shielded windows provide exceptional optical performance without sacrificing EMI shielding. This new generation of shielded windows is designed specifically to address shielding concerns in electronic equipment, especially medical devices, industrial process, measurement and control equipment, and test equipment. EmiClare GP 70 windows use a proprietary meshshielding design that provides superior light transmission and EMI shielding properties when compared to traditional shielded window designs. Total shielded window light transmittance properties, result from the mesh, substrates and surface finishes used. This new design also minimizes the typical problem with text distortion on display screens caused by the shielding mesh orientation, i.e., the moiré effect. Through improved, efficient manufacturing operations, these features are available at prices typically below conventional shielded windows. EmiClare GP 70 EMI shielded windows are manufactured as a fully laminated construction with optically matched adhesives and front and rear UL 94V-0 rated, optical grade, polycarbonate substrates. Standard finish for the front surface is a non-glare hardcoat. A clear hardcoat finish is standard on the rear surface. An optional clear hardcoat is available on the front surface.The shielding media is provided by the GP 70 proprietary mesh design.
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Winshield

DESCRIPTION: Chomerics produces a wide selection of performance-tested glass and plastic windows for visual displays requiring EMI radiation or susceptibility shielding. These windows have been designed into commercial and military equipment to provide highly effective electromagnetic shielding while providing exceptional optical clarity and image resolution. Chomerics’ prototype-to-production capability includes an extensive line of spectrally-matched filters to meet stringent contrast enhancement performance requirements for both flat and curved configurations. By offering the best combination of EMI shielding and contrast enhancement, we’ve become a major supplier to manufacturers who must meet FCC and EU (European Union) requirements on digital devices.
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Zip cable

DESCRIPTION:ZIP-EX-2 cable shielding provides convenient, inexpensive EMI and EMP shielding
of cable harnesses for computers, communications equipment and other interference-sensitive
electronic systems. It can be zipped on and off quickly, before or after the cable is installed. The shielding medium is Ferrex knitted wire mesh with a protective cover of heavy-duty vinyl, a combination that provides flexibility and durability as well as positive shielding. A brass slide fastener with rugged teeth crimped to a steel cord inside the knitted wire mesh provides continuous positive closure. ZIP-EX-2 shielding is also available with a Velcro® fastening mechanism.
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