Nickel Aluminum Silicone EMI O-Rings
68-durometer. Resists galvanic corrosion. Low outgassing per ASTM E595. Independently tested to MIL-DTL-83528.
Specialty Silicone Products (SSP) makes EMI O-rings that combine environmental sealing with shielding against electromagnetic interference (EMI)
We manufacture our own EMI silicones and fluorosilicones and have and in-house toolroom where we machine molds, jigs, and fixtures.
Choose EMI O-rings in standard or custom sizes. Made in USA with ISO 9001:2015 quality.
An EMI O-ring (electrically conductive O-ring) is a circular elastomeric seal impregnated with conductive metal fillers (such as silver-aluminum, nickel-graphite, or silver-copper) designed to fit into a groove and compress to provide simultaneous electromagnetic interference (EMI/RFI) shielding and environmental sealing (moisture, dust, fuel, or chemical barrier).
SSP can mold your EMI O-rings as a single piece or cut and bond them for lengths of extrusions.Â
Base Elastomers: Silicone, Fluorosilicone (FVMQ)
Conductive Fillers:
Silver-Aluminum (Ag/Al)
Silver-Copper (Ag/Cu)
Silver-Nickel (Ag/Ni)
Nickel-Graphite (Ni/C)
Nickel-Aluminum (Ni/Al)
Standard Sizes:
Military & Aerospace Specs: MIL-DTL-83528 QPL Certified (Types A, B, C, D, K), Low Outgassing per ASTM E595
Volume Resistivity (VR): 0.0009Ω-cm to 0.100Ω-cm
Operating Temperature: -55°C  to 160°C (application dependent)
Manufacturing Processes: Compression Molding, Continuous Extruded Cord, Hot Vulcanized / Spliced
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Selecting the proper conductive silicone elastomer depends on your required volume resistivity (VR), shielding attenuation, galvanic corrosion requirements, and fluid exposure. Fluorosilicone base materials add fuel, solvent, and chemical resistance.
| Conductive Filler Type | Base Elastomer | Hardness (Shore A) | Typical Volume Resistivity (Ω-cm) | MIL-DTL-83528 Type Match | Primary Application Advantage |
| Silver-Aluminum (Ag/Al) | Silicone | 65 | 0.003Ω-cm | Type B (QPL) | High attenuation, space-grade low outgassing |
| Silver-Aluminum (Ag/Al) | Fluorosilicone | 70 | 0.003Ω-cm | Type D (QPL) | High attenuation with fuel/solvent resistance |
| Nickel-Graphite (Ni/C) | Silicone | 68 | 0.100Ω-cm | Type C / Type K | Cost-effective, high galvanic corrosion resistance |
| Nickel-Graphite (Ni/C) | Fluorosilicone | 60 | 0.100Ω-cm | Meets MIL-DTL-83528 | Corrosion & fuel resistance for harsh environments |
| Silver-Copper (Ag/Cu) | Silicone | 65 | 0.003Ω-cm | Type A (QPL) | Maximum electrical conductivity & EMP protection |
| Nickel-Aluminum (Ni/Al) | Silicone | 68 | 0.100Ω-cm | Commercial / Mil-Grade | Galvanic compatibility with aluminum enclosures |
Conductive silicone O-rings from SSP include fluorosilicone EMI shielding O-rings and nickel-graphite silicone conductive O-rings.
Contact us for help with material selection and to discuss your conductive O-ring groove design. We make high-attenuation EMI seals.
68-durometer. Resists galvanic corrosion. Low outgassing per ASTM E595. Independently tested to MIL-DTL-83528.
60-durometer. Tested to MIL-DTL-83528. Fuel and solvent resistance.
68-durometer. Resists galvanic corrosion. Independently tested to MIL-DTL-83528 and ASTM B117.
70-durometer. M83528 QPL. Low outgassing. Independently tested to MIL-DTL-83528 and ASTM E595. Fuel and solvent resistance.
65-durometer. M83528 QPL. Low outgassing. Independently tested to MIL-DTL-83528 and ASTM E595.
72-durometer. Resists galvanic corrosion. Independently tested to MIL-DTL-83528. Fuel and solvent resistance.
SSP fabricates conductive O-rings to match military specification requirements:
M83528/002 EMI O-rings (Solid O-Rings): Standard with Solid Circular Cross-Section
M83528/005 EMI O-rings (Non-Standard/Custom ORings): Non-Standard with Custom Inner Diameters and Cross-Sections)
We produce conductive silicone and fluorosilicone O-rings matching standard AS568 EMI O-rings to fit standard commercial gland dimensions without requiring custom enclosure redesigns.
We produce conductive silicone and fluorosilicone O-rings matching standard BS 1806 EMI O-rings to fit standard commercial gland dimensions without requiring custom enclosure redesigns.
SSP manufactures direct drop-in material alternatives for leading industry brands, offering low minimum order quantities (MOQs), shorter lead times, and direct factory support.
Alternatives to Parker Chomerics CHO-SEAL®: Drop-in conductive elastomers for CHO-SEAL 1212, 1215, 1285, 1287, 1298, 6305, 6502, and 6503.
Alternatives to Discontinued W.L. Gore® Materials: Drop-in replacement materials for discontinued UL 94 V-0 flame-resistant EMI shielding options, including GORE GS2100 and GS5200.
Alternative to Nolato Jabar Materials: Drop-in replacements for 805, 815, 802 series, 812, 806-A, 816, 806-K, 822
(CHO-SEAL® is a registered trademark of Parker Hannifin Corporation. Gore® is a registered trademark of W.L. Gore & Associates, Inc. SSP is an independent manufacturer.)
SSP offers two primary manufacturing methods for conductive O-rings depending on budget, volume, lead time, and cross-section requirements.
Compression molding creates a continuous, single-piece O-ring with no splice joint. It is best suited for mature designs, tight inner diameters, or high-volume production runs where tooling costs ($2,500–$5,000 per mold) are amortized over large quantities.
For prototyping, low-to-medium volume production, or large-diameter enclosure seals (developed lengths of 7 inches or greater), hot splicing extruded conductive cord stock eliminates expensive mold tooling charges and reduces lead times from months to days.
Electrically Conductive Adhesive: Unlike competitors who use non-conductive RTV silicone or cyanoacrylate (super glue)—which leaves an EMI leakage pathway—SSP hot-vulcanizes the joint using a matching conductive silicone adhesive.
No Hard Spots: Cold acrylic glues dry rock-hard, creating a stiff section along the O-ring that hinders uniform compression. SSP’s hot-spliced adhesive matches the durometer and flexibility of the base conductive elastomer.
Thermal Resistance: Our conductive vulcanized joint withstands the full $-55^\circ\text{C}$ to $+160^\circ\text{C}$ operating temperature range of the cord stock.
A standard rubber O-ring provides environmental sealing (blocking fluids, dust, and gases) but is an electrical insulator. A conductive EMI O-ring is loaded with microscopic metal particles that allow electrical current to pass through the gasket, grounding the enclosure and blocking electromagnetic radiation (RFI/EMI) while maintaining environmental sealing.
Choose Silver-Aluminum (Ag/Al) when high shielding effectiveness ($100+\text{ dB}$ attenuation) and MIL-DTL-83528 QPL certification are required, particularly in aerospace and military applications. Choose Nickel-Graphite (Ni/C) when high galvanic corrosion resistance against aluminum flanges is critical, or for cost-conscious commercial applications requiring strong shielding performance ($90+\text{ dB}$).
Select silicone for general military, aerospace, and commercial applications requiring broad thermal tolerance ($-55^\circ\text{C}$ to $+200^\circ\text{C}$) and weather resistance. Select fluorosilicone (FVMQ) if the O-ring will come into direct contact with fuels, hydraulic fluids, solvents, or oils.
Need custom conductive O-ring dimensions, assistance with groove design, or drop-in CHO-SEAL® alternatives? SSP offers rapid turnaround on prototype samples, low minimum order quantities, and direct engineering support.
Contact Specialty Silicone Products Today:
Phone: 800-437-1442 / 518-885-8826
Location: Ballston Spa, NY (Made in USA)
Response Time: We typically reply to all engineering inquiries within one business day.