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Electromagnetic shielding O-rings and washers
What are electromagnetic shielding O-rings and washers?
A composite sealing ring that seals against water and dust, and also shields against electromagnetic interference. Ordinary O-rings: only provide a seal (waterproof, dustproof, oilproof, and leak-proof). Electromagnetic shielding O-rings: incorporate conductive materials (silver, copper, nickel, graphite, silver-plated aluminum, etc.) into the rubber, making it both sealing and conductive.
Electromagnetic interference shielding O-rings and gaskets can be designed to:
Be highly weather-resistant, effectively preventing rain and snow intrusion (IP54, NEMA 3)
Be waterproof and leak-proof, able to withstand high-pressure cleaning (IP65, IP66, NEMA 4X)
Be submersible to prevent underwater ingress (IP67, NEMA 6)
If you require more information or a quote, please call +8618730921709 or fill out a product inquiry form to confirm whether your request has been fulfilled.
Compounds for electromagnetic shielding O-rings and gaskets
Electromagnetic interference (EMI)/radio frequency (RF) shielding materials typically use silicone rubber or fluorosilicone rubber as a base material, filled with metal or metal-coated particles. Silicone rubber offers excellent resistance to water, ozone, and UV radiation, as well as a wide operating temperature range. Fluorosilicone rubber not only possesses all the advantages of silicone rubber but also enhances its resistance to fuels and solvents. Commonly used conductive fillers include silver-aluminum, silver-copper, nickel-aluminum, and nickel-graphite particles, which differ in cost, conductivity, and volume resistivity (VR, an indirect measure of shielding effectiveness).
Due to the higher cost of silver-based fillers, nickel-graphite-filled silicone rubber O-rings and gaskets are widely used in commercial applications. Aerospace and defense applications often require materials conforming to MIL-DTL-83528 standards, and these materials typically contain silver-based fillers.
The table below summarizes EMI shielding materials and their corresponding Parker Chomerics EMI compounds.
For various critical applications in the oil and gas industry, if you require customized O-rings and matching sealing solutions, KODA is your ideal partner.
To place an order or for more information, please call +86 18730921709 or fill out the product inquiry form.
| 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 | $$$$ | 65 | .008 ohm/cm | 100 dB | Meets MIL-DTL-83528, TYPE B | 1285 |
| EMI-550, EMI-2486 | Silver Aluminum in Fluorosilicone | $$$$ | 70 | .012 ohm/cm | 100 dB | Meets MIL-DTL-83528, TYPE D Fuel and Solvent Resistant | 1287, 1298 |
| EMI-2569 | Silver Copper in Silicone | $$$$ | 65 | .0015 ohm/cm | >145 dB | Highest Conductivity and Shielding Available | 1215 |
| EMI-2529 | Nickel Aluminum in Silicone | $$$ | 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 |
Electromagnetic shielding rubber properties and vulcanization points
O-rings and washers can be made from various profiles as shown in the image below and are vulcanized with adhesive to ensure continuous and stable EMI/RFI shielding performance at the joint, which is crucial for achieving overall shielding effectiveness. Vulcanized EMI/RFI O-rings offer comparable overall conductivity and electromagnetic interference suppression to molded products, while providing a significant cost advantage.
For more information on the cost-effectiveness of vulcanized EMI/RFI O-rings, please feel free to contact us. If you have any questions, require a quote for EMI/RFI products, or wish to specify Parker Chomerics material in your application, please call +86 18730921709 or fill out the product inquiry form. We will respond to your request within one business day.
Electromagnetic shielding O-rings/gaskets: outline dimensions and part numbers
Electromagnetic shielding O-rings and gaskets are numbered in the following format: EMI + Profile Code + Size + Material Code. The size is a predefined standard specification containing all relevant parameters. The following example is a molded EMI O-ring made of fluorosilicone rubber with nickel-graphite filler, with a size of 155 (0.103-inch cross-sectional diameter, 3.987-inch inner diameter).
The table below lists various EMI shielding profile extrusions and their corresponding dimensions. The table also includes the relevant MIL-DTL-83528 standard part numbers and KODA O-ring part numbers.
Type 002: Molded O-rings; Type 02V: Vulcanized O-rings
| AS568 0-Ring Size - 002 | Cross-Section (CS - Inch) | Cross-Section (CS - Metric) | Inside Diameter(ID- Inch) | Inside Diameter(ID-Metric) | MIL-DTL-83528 Part Number | KODA 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-ring extrusion
| Solid 0-Shape Extrusion Size - 001 | Dimension A (Inch) | Dimension A (Metric) | MIL-DTL-83528 Part Number | KODA 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-ring Extrusion
| Hollow O-Shape ExtrusionSize - 011 | Dimension A (Inch) | Dimension A (Metric) | Dimension B (Inch) | Dimension B (Metric) | MIL-DTL-83528 Part Number | KODA 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-shaped 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 | KODA 0-Ring PartNumber |
|---|---|---|---|---|---|---|---|---|
| 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-shaped 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 | KODA 0-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 Rectangular Extrusion
| Rectangle Shape ExtrusionSize-009 | Dimension A (Inch) | Dimension A (Metric) | Dimension B (Inch) | Dimension B (Metric) | MIL-DTL-83528 Part Number | KODA 0-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 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 | KODA 0-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-shaped extrusion
| Hollow P-ShapeExtrusion 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 | KODA 0-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 |