Wire Mesh Gaskets
Chomerics offers the broadest range of metal-based EMI gaskets available.
These products include knitted wire mesh, mesh over elastomer core, oriented wires in elastomers, and metal screen or expanded foil impregnated elastomers
- All mesh knit from Aluminium or Monel (nickel-copper alloy)
- Mesh knitted around a square or round core of neoprene or silicone.
- Combo strip gaskets, a flat neoprene or silicone sponge with a mesh on the edge for shielding.
- Compressed mesh gaskets, good for high temperature applications.
- Framed mesh. Custom made frames with a mesh on the edges for shielding.
Metal EMI MESH STRIP® All Metals Gaskets
MESH STRIP gaskets are compressible, all-metal EMI/EMP strips knitted into rectangular or round cross sections. The knitted wire forms many spring-like interlocked loops, making it highly resilient. Standard MESH STRIP gaskets are knitted from either monel (a nickelcopper alloy) or Ferrex* (tin-plated, copper-clad steel) wire.
Metal EMI MESH STRIP® with Elastomer Core Gaskets
Standard MESH STRIP gasketing with elastomer core consists of two layers* of wire mesh knitted around a rectangular or round core of neoprene or silicone. The knitted wire mesh provides the electrical conductivity for EMI/EMP shielding, and the core provides excellent compressibility with a high degree of resilience. Closing force is in the 50-100 psi (0.34-0.69 MPa) range.
Metal EMI COMBO® STRIP Gaskets
COMBO® STRIP Gaskets combine MESH STRIP gasketing in parallel with an integral non conductive elastomer weathersealing strip. COMBO STRIP gasketing is recommended for applications requiring a weather seal in addition to EMI/EMP shielding. This type of gasketing is also useful in applications requiring shielding only and where the adhesive backing on the elastomer would provide a convenient means of mounting. To obtain a reliable shield and seal, both portions of the COMBO STRIP gasket must come in contact with both mating surfaces. For applications in which overcompression might cause deterioration of the elastomer seal, metal compression stops may be incorporated within the elastomer portion of the gasket.
POLA® SOLID Oriented Wire in Elastomer
POLA SOLID is a composite electromagnetic interface (EMI) shielding and environmental sealing gasket material consisting of hundreds of individual fine wires embedded into the z-axis of solid elastomer. Available in various flat seal configurations, including sheets, strips and die-cut parts, POLA SOLID is easily integrated into existing application assemblies, making the switch from a non-EMI solution possible. With comparable performance at a fraction of the cost of alternative solutions that provide both EMI shielding and weather sealing performance, as well as the opportunity to exactly match the galvanic potential of interfacing aluminum surfaces, POLA SOLID provides total cost of ownership savings in excess of 50% through price point and corrosion rework reductions.
POLA® SPONGE Oriented Wire in Soft Elastomer
POLA SPONGE is a composite electromagnetic interface (EMI) shielding and environmental sealing gasket material consisting of hundreds of individual fine wires embedded into the z-axis of soft closed cell, silicone sponge elastomer. Available in various flat seal configurations, including sheets, strips and die-cut parts, POLA SPONGE is easily integrated into existing application assemblies, making the switch from a non-EMI solution possible. With force requirements for gasket deflection that can be more than half that of alternative solutions that provide both EMI shielding and weather sealing performance, POLA SPONGE provides the opportunity for increased design leniencies such as thinner flange requirements and reduced fastener quantities. The result is the potential for a total cost of ownership reduction in excess of 75% through weight, material and labour savings.
METALASTIC™ and PORCUPINE METALASTIC™ EMI Gasketing with Pressure Seal
Chomerics METALASTIC gasketing is a composite EMI and pressure seal in thin sheet form. Shielding is provided by a woven aluminum mesh, and pressure sealing is achieved by neoprene, silicone or fluorosilicone elastomer impregnated in the mesh. METALASTIC gasketing is intended for use only in applications in which joint unevenness is less than 0.002 in. (0.05 mm), and/or where space is severely limited. The material can be easily cut into gaskets of intricate shapes, and is available with a minimum nominal thickness of 0.016 in. (0.40 mm). These gaskets are not intended to be re-used after joints are opened.
PORCUPINE METALASTIC is available in two forms: EMI shielding with pressure seal filled and EMI shielding only (unfilled). Shielding is provided by severely expanded Monel or Aluminum foil. For composite shielding and pressure sealing, the expanded Monel is filled with a silicone or fluorosilicone elastomer. The material gains its excellent compressibility from very uniform thickness. The expanded Monel provides dozens of contact points per square inch of surface area, assuring moderate shielding effectiveness. PORCUPINE METALASTIC gasketing is intended for applications in which joint unevenness is less than 0.003 in. (0.08 mm) and where the gasket must be less than 4 x 6 in. (102 x 152 mm). These gaskets are not intended to be re-used after joints are opened.
Metal EMI SHIELDMESH™ Compressed Mesh Gaskets
SHIELDMESH compressed mesh EMI gaskets are jointless, with either round or rectangular cross sections. They are made by die-compressing knitted wire mesh into a wide range of shapes and resiliencies. Gaskets can be produced in common metals or other metals for special requirements.
SHIELDMESH gaskets are designed for applications requiring small round or rectangular EMI seals such as waveguide choke flanges, or for shafts or small housings. Due to high compression set, they are not recommended where mating joints must be opened and closed. Parts are normally supplied as medium density, but this can be varied to suit applications.
Metal EMI Frame Gaskets and Strips
EMI/EMP Frame Gaskets and Strips These frame-mounted gaskets incorporate a length of MESH STRIP gasketing (with or without elastomer core), securely crimped into the edge of extruded aluminum mounting frames. They are available as ready-to-mount welded aluminum picture frames, fabricated lengths, or standard 7.5 ft. lengths. In addition to allowing simple mechanical mounting, the aluminum frames function as positive compression stops, preventing over-compression of the gaskets. Frames can be supplied unfinished, chromate finished to MIL-DTL-5541, Class 3, and painted to customer specifications.