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EMI O-rings EMI conductive gaskets emi shielding

EMI O-rings and EMI conductive gaskets

EMI O-rings, EMI Gaskets and EMI Shielding provide OEM's protection against unwanted EMI radiation. EMI shielding o-rings and EMI shielded conductive gaskets using electrically conductive CHO-Seal® Conductive elastomers from Chomerics are critical for improving electronic device performance. We offer EMI shielding orings and EMI conductive gaskets for demanding electronic, ruggedized and outdoor EMI shielding applications.  Sealing Devices offers EMI shielding applications support and design assistance for integrating EMI shielding CHO-Seal conductive o-rings and THERM-A-GAP® pads and thermal management gap fillers.   

EMI Shielding Gaskets and O-rings from Chomerics

Evaluating EMI Shielding Gasket and O-ring Effectiveness
Choose EMI shielding o-rings based on the radiated emission spectrum of your equipment, and the specifications the unit must meet. Various EMI o-ring and EMI gaskets provide different levels of EMI shielding effectiveness across the frequency range of 10 kHz to 20 GHz.  Download the Chomerics selector guide for Cho-Seal and Soft-Shield 5000 materials.   

EMI Operating Conditions
Many EMI o-rings and EMI conductive gaskets provide a 'best fit' for different operating environmental conditions, including exposure to high and low temperatures, wind and rain, salt spray, solvents and other conditions severely effect the life of EMI shielded gaskets and EMI shielded o-rings.

EMI Mechanical Requirements
The primary goal of an EMI shielded gasket is to seal an electronic enclosure to prevent transmission of electromagnetic interference. Improper design of the EMI seal or enclosure flanges can result in failure. Mechanical design issues must be considered for the proper mating of an EMI gasket with the flanges of an electronic enclosure based on EMI conductive shielding theory. 

EMI shielded gaskets require compressive force, and must deflect 30-40% under low closure force to properly maintain contact with mating flanges to function properly

Compression SetEMI O-Rings
EMI shielded gaskets subjected to compressive forces over an extended time causes 'deflection' to remain when the load is removed. EMI gasket compression set is an important property when an EMI gasket will be compressed and released regularly in enclosure door and access panel service.

Electrical Stability
EMI gaskets and EMI O-rings provide conductive pathways that electrically bond system components to a common ground. The EMI shielded gaskets serve as low impedance conductors to improve the reliability of an enclosure.

Installed Cost
EMI gasket installation can be a major factor in determining costs, and EMI Shielded gaskets can be installed using PSA's, fasteners, epoxies, or by press-fitting into grooves.  EMI gaskets can be molded in place on the enclosure flange or on a plastic spacer frame.

Gasket Mounting Choices
EMI gasket mounting techniques offer cost-effective choices in materials and assembly. Most EMI shielded Chomerics gaskets attach easily and our Applications Engineers can provide full details on EMI gasket mounting.

Finding EMI shielded conductive o-rings and EMI elastomers for effective EMI shielding using CHO-Seal® Soft-Shield®, Metal EMI Gaskets, Fingerstock and EMI low closure force gasketing from Chomerics for your wireless communications or enclosures from Sealing Devices has never been easier.

Need help with EMI conductive shielding theory?  Review with our experienced EMI theory Applications Engineers today, or download the Chomerics design information highlighting EMI conductive shielding theory.

Cho-Seal, Soft-Shield,Therm-a-Gap,Cho-Therm and Win-Shield are registered trademarks of Parker Chomerics.

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PSA emi shielding options Friction Fit in Groove EMI shielding EMI Adhesive Compounds

Pressure Sensitive Adhesive

Quick efficient attachment strip

Friction fit in a groove

Prevents over-deflection of gasket Retaining groove required
  • Conductive Elastomers

Adhesive Compounds

Conductive of non-conductive spot bonding
  • Conductive Elastomers
Form-in-place robotically dispensed gaskets Friction fit on tangs EMI Spacer gaskets

Robotically Dispensed Formed-in-Place Conductive Elastomer

  • Chomerics' Cho-Form™ automated technology applies high quality conductive elastomer gaskets to metal or plastic housings. Manufacturing options include Chomerics facilities, authorized Application Partners, and turnkey systems.

Friction Fit on Tangs

Accommodates thin walls, intricate shapes
  • Conductive Elastomers

Spacer Gaskets

Accommodates thin walls, intricate shapes
  • Fully customized, integral conductive elastomer and plastic spacer provide economical EMI shielding and grounding in small enclosures. Locator pins ensure accurate and easy installation, manually or robotically.
Chomerics Clip On Gaskets Chomerics Conductive Elastomers Chomerics Frame Gaskets

Clip-on Gaskets

 Require knife edge mounting flange.

  • Conductive Elastomers
  • SOFT-SHIELD 5000


Require integral compression stops
Require mounting holes on flange
  • Conductive Elastomers


Extruded aluminum frames and strips add rigidity
  •  Built-in compression stops for rivets and screws.
  • Conductive Elastomers
  • Mesh Strip