What Are EMI/RFI-Shielded O-Rings and Gaskets?

Global O-Ring and Seal supplies o-rings and gaskets that provide shielding against EMI (Electromagnetic Interference) and RFI (Radio Frequency Interference). EMI/RFI o-ring and gasket materials are filled with electrically-conductive particles used to reduce the effect of electronic interference from electronics and electro-mechanical devices. Our EMI o-rings and gaskets compare closely to Parker Chomerics EMI o-rings and gaskets.

Electrically conductive o-rings and gaskets with EMI shielding are applied to enclosure covers, doors, and vulnerable areas to prevent or restrict electromagnetic emission from interfering with other electronic components. As electronic devices play an ever-larger role in automotive, aviation, medical, other industries, the electromagnetic/radio frequency interference (EMI/RFI) shielding market continues to grow.

In addition to managing EMI and RFI interference, electrically conductive o-rings and gaskets are used for environmental sealing. EMI o-rings and gaskets can be designed to be:

  • Weather-Resistant to seal out rain and sleet (IP54, NEMA 3)
  • Watertight to withstand pressure washing (IP65, IP66, NEMA 4X)
  • Submersible to prohibit ingress underwater (IP67, NEMA 6)

If you would like more information, or to request a quote, please give us a call at 832-408-9975 or fill out the Product Inquiry Form to confirm your request is being met.

EMI/RFI O-Ring and Gasket Compounds

The EMI/RFI materials typically use a base of either silicone or fluorosilicone, which is then filled with metal or metal-coated particles. Silicone material can withstand water, ozone, UV light, and a wide range of temperatures. Fluorosilicone material has all of the features of Silicone with added resistance to fuels and solvents. The metal or metal-coated particles include silver-aluminum, silver-copper, nickel-aluminum, and nickel-graphite particles. These fillers differ in terms of cost, conductivity, and typical volume resistivity (VR) – an indirect measure of shielding effectiveness.

Silicone o-rings and gaskets filled with nickel-graphite are widely used for commercial applications where the higher cost of silver-based filler materials is prohibitive. Aerospace and Defense applications often require materials that meet MIL-DTL-83528 which most often include silver-based fillers.

The table below provides a high-level summary of EMI materials, along with their equivalent Parker Chomerics EMI compounds.

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Compound Name
Compound Composition
Cost
Durometer
MAX VR
MIN Shielding Effectiveness 20 MHZ to 10 GHZ (MIL-DTL-83528)
Features
Parker Chomerics Compound Interchange
EMI-2368 Silver Aluminum in Silicone $$$$ 65 .008 ohm/cm 100 dB Meets MIL-DTL-83528, TYPE B 1285
EMI-550, EMI-2486 Silver Aluminum in Fluorosilicone $$$$ 70 .012 ohm/cm 100 dB Meets MIL-DTL-83528, TYPE D Fuel and Solvent Resistant 1287, 1298
EMI-547, EMI-553 Silver Copper in Silicone $$$$ 65 / 80 .004 ohm/cm 110 dB Highest Conductivity and Shielding Available 1215
EMI-2529 Nickel Aluminum in Silicone $$$ 70 .15 ohm/cm 100 dB Corrosive Resistant 6502
EMI-2551 Nickel Aluminum in Fluorosilicone $$$ 70 .25 ohm/cm 100 dB Corrosive Resistant, Fuel and Solvent Resistant 6503
EMI-502F Nickel Graphite in Fluorosilicone $$ 60 .1 ohm/cm 100 dB Fuel and Solvent Resistance L6303
EMI-502 Nickel Graphite in Silicone $ 65 .1 ohm/cm 100 dB Lowest Cost with High Shielding 6308

EMI/RFI Profiles and Vulcanization

O-Rings and gaskets are vulcanized from any of the profiles shown below with a bonding agent that ensures continuity of the EMI/RFI protection at the joint. This is critical to achieving the overall results. The overall conductivity and EMI suppression of a vulcanized EMI/RFI o-ring are equivalent to a molded EMI/RFI o-ring but at a much lower price. Read more on how vulcanized EMI/RFI o-rings are the better economical option.

If you have any questions or would like a quote on EMI/RFI products or if your application specifically requires Parker Chomerics, please give us a call at 832-448-5550 or fill out the Product Inquiry Form. We will respond to your request within one business day.

EMI O-Ring/Gasket Profile and Part Numbering

Part numbering for EMI o-ring and gaskets uses the following format: EMI, Profile Code, Size, and Material Code. Size is pre-defined and encompasses all associated dimensions. The example below shows a molded EMI o-ring made with Nickel Graphite in Fluorosilicone material in the 155 Size (.103″ CS, 3.987″ ID).

 

 

Below, are the different EMI profile extrusions with their respective dimensional tables. These tables also contain the associated MIL-DTL-83528 Part Number and our Global O-Ring Part Number.

Profile 002: Molded O-Ring, Profile 02V: Vulcanized O-Ring

AS568 O-Ring Size – 002 Cross-Section (CS - Inch) Cross-Section (CS - Metric) Inside Diameter (ID - Inch) Inside Diameter (ID - Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
007 0.07 1.78 0.145 3.68 M83528/002X007 EMI-002-007-XXXX
011 0.07 1.78 0.301 7.65 M83528/002X011 EMI-002-011-XXXX
012 0.07 1.78 0.364 9.25 M83528/002X012 EMI-002-012-XXXX
013 0.07 1.78 0.426 10.82 M83528/002X013 EMI-002-013-XXXX
014 0.07 1.78 0.489 12.42 M83528/002X014 EMI-002-014-XXXX
015 0.07 1.78 0.551 13.99 M83528/002X015 EMI-002-015-XXXX
017 0.07 1.78 0.676 17.17 M83528/002X017 EMI-002-017-XXXX
018 0.07 1.78 0.739 18.77 M83528/002X018 EMI-002-018-XXXX
019 0.07 1.78 0.801 20.34 M83528/002X019 EMI-002-019-XXXX
020 0.07 1.78 0.864 21.94 M83528/002X020 EMI-002-020-XXXX
021 0.07 1.78 0.926 23.52 M83528/002X021 EMI-002-021-XXXX
022 0.07 1.78 0.989 25.12 M83528/002X022 EMI-002-022-XXXX
024 0.07 1.78 1.114 28.3 M83528/002X024 EMI-002-024-XXXX
026 0.07 1.78 1.239 31.47 M83528/002X026 EMI-002-026-XXXX
028 0.07 1.78 1.364 34.65 M83528/002X028 EMI-002-028-XXXX
114 0.103 2.62 0.612 15.54 M83528/002X114 EMI-002-114-XXXX
115 0.103 2.62 0.676 17.17 M83528/002X115 EMI-002-115-XXXX
117 0.103 2.62 0.799 20.29 M83528/002X117 EMI-002-117-XXXX
126 0.103 2.62 1.362 34.59 M83528/002X126 EMI-002-126-XXXX
128 0.103 2.62 1.487 37.77 M83528/002X128 EMI-002-128-XXXX
132 0.103 2.62 1.737 44.12 M83528/002X132 EMI-002-132-XXXX
134 0.103 2.62 1.862 47.3 M83528/002X134 EMI-002-134-XXXX
142 0.103 2.62 2.362 59.99 M83528/002X142 EMI-002-142-XXXX
145 0.103 2.62 2.55 64.77 M83528/002X145 EMI-002-145-XXXX
155 0.103 2.62 3.987 101.27 M83528/002X155 EMI-002-155-XXXX

 

Profile 001: Solid O-Shape Extrusion

Solid O-Shape Extrusion Size – 001 Dimension A (Inch) Dimension A (Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
001 0.04 1.02 M83528/001X001 EMI-001-001-XXXX
002 0.053 1.35 M83528/001X002 EMI-001-002-XXXX
003 0.062 1.57 M83528/001X003 EMI-001-003-XXXX
004 0.07 1.78 M83528/001X004 EMI-001-004-XXXX
005 0.08 2.03 M83528/001X005 EMI-001-005-XXXX
006 0.093 2.36 M83528/001X006 EMI-001-006-XXXX
007 0.103 2.62 M83528/001X007 EMI-001-007-XXXX
008 0.119 3.02 M83528/001X008 EMI-001-008-XXXX
009 0.125 2.18 M83528/001X009 EMI-001-009-XXXX
010 0.139 3.53 M83528/001X010 EMI-001-010-XXXX
011 0.188 4.78 M83528/001X011 EMI-001-011-XXXX
012 0.216 5.49 M83528/001X012 EMI-001-012-XXXX
013 0.25 6.35 M83528/001X013 EMI-001-013-XXXX

Profile 011: Hollow O-Shape Extrusion

Hollow O-Shape Extrusion Size – 011 Dimension A (Inch) Dimension A (Metric) Dimension B (Inch) Dimension B (Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
001 0.125 3.18 0.13 3.3 M83528/011X001 EMI-011-001-XXXX
002 0.156 3.96 0.16 4.06 M83528/011X002 EMI-011-002-XXXX
003 0.25 6.35 0.255 5.71 M83528/011X003 EMI-011-003-XXXX
004 0.312 7.92 0.317 8.05 M83528/011X004 EMI-011-004-XXXX
005 0.375 9.53 0.38 9.65 M83528/011X005 EMI-011-005-XXXX
006 0.125 3.18 0.13 3.3 M83528/011X006 EMI-011-006-XXXX
007 0.103 2.62 0.107 2.72 M83528/011X007 EMI-011-007-XXXX
008 0.177 4.5 0.182 4.62 M83528/011X008 EMI-011-008-XXXX

Profile 003: Solid D-Shape Extrusion

Solid D-Shape Extrusion Size – 003 Dimension A (Inch) Dimension A (Metric) Dimension B (Inch) Dimension B (Metric) Dimension C (Inch) Dimension C (Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
001 0.031 0.78 0.062 1.57 0.068 1.73 M83528/003X001 EMI-003-001-XXXX
002 0.047 1.19 0.094 2.39 0.078 1.98 M83528/003X002 EMI-003-002-XXXX
003 0.039 0.99 0.078 1.98 0.089 2.26 M83528/003X003 EMI-003-003-XXXX
004 0.047 1.19 0.094 2.39 0.094 2.39 M83528/003X004 EMI-003-004-XXXX
005 0.031 0.78 0.062 1.57 0.1 2.54 M83528/003X005 EMI-003-005-XXXX
006 0.075 1.91 0.15 3.81 0.11 2.79 M83528/003X006 EMI-003-006-XXXX
007 0.061 1.55 0.122 3.1 0.135 3.43 M83528/003X007 EMI-003-007-XXXX
008 0.059 1.49 0.118 3 0.156 3.96 M83528/003X008 EMI-003-008-XXXX
009 0.078 1.98 0.156 3.96 0.156 3.96 M83528/003X009 EMI-003-009-XXXX
010 0.089 2.26 0.178 4.52 0.175 4.45 M83528/003X010 EMI-003-010-XXXX
011 0.094 2.39 0.188 4.78 0.188 4.78 M83528/003X011 EMI-003-011-XXXX
012 0.125 3.18 0.25 6.35 0.25 6.35 M83528/003X012 EMI-003-012-XXXX

Profile 007: Hollow D-Shape Extrusion

Hollow D-Shape Extrusion Size – 007 Dimension A (Inch) Dimension A (Metric) Dimension B (Inch) Dimension B (Metric) Dimension C (Inch) Dimension C (Metric) Dimension D (Inch) Dimension D (Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
001 0.156 3.96 0.078 1.98 0.078 1.98 0.045 1.14 M83528/007X001 EMI-007-001-XXXX
002 0.187 4.75 0.093 2.36 0.093 2.36 0.05 1.27 M83528/007X002 EMI-007-002-XXXX
003 0.312 7.92 0.156 3.96 0.156 3.96 0.062 1.57 M83528/007X003 EMI-007-003-XXXX
005 0.312 7.92 0.2 5.08 0.112 2.84 0.062 1.57 M83528/007X005 EMI-007-005-XXXX
006 0.487 12.37 0.08 2.03 0.244 6.2 0.08 2.03 M83528/007X006 EMI-007-006-XXXX
007 0.25 6.35 0.125 3.18 0.125 3.18 0.065 1.65 M83528/007X007 EMI-007-007-XXXX

Profile 009: Rectangle Shape Extrusion

Rectangle Shape Extrusion Size – 009 Dimension A (Inch) Dimension A (Metric) Dimension B (Inch) Dimension B (Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
001 0.063 1.6 0.042 1.07 M83528/009X001 EMI-009-001-XXXX
002 0.095 2.41 0.062 1.57 M83528/009X002 EMI-009-002-XXXX
003 0.12 3.05 0.075 1.91 M83528/009X003 EMI-009-003-XXXX
004 0.125 3.18 0.062 1.57 M83528/009X004 EMI-009-004-XXXX
005 0.156 3.96 0.062 1.57 M83528/009X005 EMI-009-005-XXXX
006 0.25 6.35 0.062 1.57 M83528/009X006 EMI-009-006-XXXX
007 0.5 12.7 0.075 1.91 M83528/009X007 EMI-009-007-XXXX
008 0.5 12.7 0.125 3.18 M83528/009X008 EMI-009-008-XXXX
009 0.5 12.7 0.188 4.78 M83528/009X009 EMI-009-009-XXXX
010 0.75 19.05 0.062 1.57 M83528/009X010 EMI-009-010-XXXX
011 0.88 22.35 0.062 1.57 M83528/009X011 EMI-009-011-XXXX
012 1 25.4 0.25 6.35 M83528/009X012 EMI-009-012-XXXX
013 1.18 29.97 0.062 1.57 M83528/009X013 EMI-009-013-XXXX

Profile 010: Channel Shape Extrusion

Channel Shape Extrusion Size – 010 Dimension A (Inch) Dimension A (Metric) Dimension B (Inch) Dimension B (Metric) Dimension C (Inch) Dimension C (Metric) Dimension D (Inch) Dimension D (Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
001 0.1 2.54 0.1 2.54 0.034 0.86 0.033 0.84 M83528/010X001 EMI-010-001-XXXX
002 0.126 3.2 0.11 2.79 0.025 0.64 0.05 1.27 M83528/010X002 EMI-010-002-XXXX
003 0.126 3.2 0.225 5.72 0.02 0.51 0.075 1.91 M83528/010X003 EMI-010-003-XXXX
004 0.156 3.96 0.156 3.96 0.062 1.57 0.047 1.19 M83528/010X004 EMI-010-004-XXXX
005 0.175 4.45 0.156 3.96 0.047 1.19 0.075 1.91 M83528/010X005 EMI-010-005-XXXX
006 0.327 8.31 0.235 5.97 0.062 1.57 0.115 2.92 M83528/010X006 EMI-010-006-XXXX

Profile 008: Hollow P-Shape Extrusion

Hollow P-Shape Extrusion Size – 008 Dimension A (Inch) Dimension A (Metric) Dimension B (Inch) Dimension B (Metric) Dimension C (Inch) Dimension C (Metric) Dimension D (Inch) Dimension D (Metric) MIL-DTL-83528 Part Number Global O-Ring Part Number
001 0.2 5.08 0.08 2.03 0.065 1.65 0.062 1.57 M83528/008X001 EMI-008-001-XXXX
002 0.25 6.35 0.125 3.18 0.25 6.35 0.062 1.57 M83528/008X002 EMI-008-002-XXXX
003 0.25 6.35 0.125 3.18 0.375 9.53 0.062 1.57 M83528/008X003 EMI-008-003-XXXX
004 0.25 6.35 0.15 3.96 0.375 9.53 0.062 1.57 M83528/008X004 EMI-008-004-XXXX
005 0.312 7.92 0.187 4.75 0.563 14.3 0.062 1.57 M83528/008X005 EMI-008-005-XXXX
006 0.36 9.14 0.255 6.48 0.42 10.67 0.07 1.79 M83528/008X006 EMI-008-006-XXXX
007 0.2 5.08 0.08 2.03 0.275 6.99 0.062 1.57 M83528/008X007 EMI-008-007-XXXX
008 0.25 6.35 0.125 3.18 0.625 15.88 0.062 1.57 M83528/008X008 EMI-008-008-XXXX