Our Solutions
Conductive O-Rings
EMI O-rings are electrically conductive gaskets that provide constant shielding against electromagnetic interference (EMI), disturbances that can disrupt electronic components, modules, and systems. These EMI shielding gaskets are made of specialty materials that are packed with metallic or metal-coated particles. Silicones, a family of synthetic elastomers, withstand a wide range of temperatures and provide environmental sealing. The metallic or metal-coated particles in EMI silicones and Flurosilicones provide electrical conductivity. O-Rings are fabricated to the customer’s dimensional requirements.Key Advantages of O-Rings
- Simple, cost-effective sealing solution
- Compatible with static and dynamic sealing
- Available in thousands of sizes (AS568, ISO, custom)
- Works across wide ranges of temperature, chemical compatibility, & durometer
- Easy to install and replace
O-Ring Material Selection Guide
Selecting the correct material is critical to ensure sealing reliability. Below is an in-depth comparison of major elastomers used for O-rings:EPDM (Ethylene Propylene Diene Monomer)
Key Properties
- Excellent resistance to weathering, ozone, UV, steam, and polar fluids
- Good flexibility and aging characteristics
Common Applications
- Water systems & potable water
- HVAC
- Steam handling systems
- Pharmaceutical/food-grade systems (when peroxide-cured
- Outdoor use / weather exposure
Temperature Range
- -50°C to +150°C (-58°F to +302°F)
Perfluoroelastomers (FFKM, e.g., Kalrez®, Chemraz®)
Key Properties
- Highest chemical resistance of any elastomer (nearly universal chemical compatibility)
- Provides sealing capabilities similar to PTFE but with elasticity
Common Applications
- Semiconductor manufacturing
- Chemical processing
- Pharmaceutical & biotech
- Aerospace & defense
- Harsh, high-temp sealing environments
Temperature Range
- -15°C to +327°C (5°F to +620°F), depending on compound
Fluorosilicone (FVMQ)
Key Properties
- Similar to silicone but with improved fuel and oil resistance
- Remains flexible at low temperatures
- Excellent UV, ozone, and weather resistance
Common Applications
- Aerospace fuel systems
- Military and defense
- Automotive turbo systems
- Jet fuels & aviation fluids
Temperature Range
- -60°C to +200°C (-76°F to +392°F)
FKM (Fluorocarbon, Viton®)
Key Properties
- Excellent chemical, fuel, and oil resistance
- Excellent high-temperature performance
- Good compression set resistance
Common Applications
- Automotive & aerospace fuel systems
- Oil & gas
- Industrial machinery
- Vacuum systems
- Chemical processing
Temperature Range
- -20°C to +205°C (-4°F to +401°F)
Special grades up to 300°C (572°F)
Nitrile Butadiene Rubber (NBR / Buna-N)
Key Properties
- Excellent resistance to oils, fuels, and hydrocarbons
- Good mechanical strength and abrasion resistance
- Most common and cost-effective O-ring material
Common Applications
- Hydraulic systems
- Pneumatics
- Automotive fuel & oil handling
- General industrial use
Temperature Range
- -40°C to +120°C (-40°F to +248°F)
PTFE (Polytetrafluoroethylene, Teflon®)
Key Properties
- Chemically inert to nearly all fluids
- Lowest friction coefficient of any solid material
- Outstanding temperature resistance
- Does not require lubrication
Common Applications
- Chemical processing
- Food & pharmaceutical
- Cryogenic applications
- High-pressure environments
- Semiconductors
- Static seals where extrusion resistance is critical
Temperature Range
- -200°C to +260°C (-328°F to +500°F)
Material Comparison Table
Key Advantages of O-Rings
| Material | Temperature Range (°C) | Fuel/Oil Resistance | Chemical Resistance | Common Uses |
| NBR | -40 to +120 | Good | Fair | Automotive, hydraulics |
| EPDM | -50 to +150 | Poor | Good (polar fluids) | Water, steam, outdoor |
| FKM (Viton) | -20 to +205 | Excellent | Good | Fuel systems, chemicals |
| FVMQ (Fluorosilicone) | -60 to +200 | Good | Fair | Aerospace fuel systems |
| PTFE | -200 to +260 | Excellent | Excellent | Chemical processing, high temp |
| FFKM | -15 to +327 | Excellent | Best available | Semiconductor, aerospace |
Choosing the Right O-Ring
- Temperature exposure
- Chemical compatibility
- Compression & pressure range
- Dynamic vs static sealing
- Regulatory compliance (FDA, NSF, MIL-spec, ISO)
- Lifetime and replacement interval
Industries Served
- Aerospace & defense
- Semiconductor
- Medical devices
- Automotive / EV
- Chemical processing
- Oil & gas
- HVAC / plumbing
- Marine / offshore
- Electronics / EMI shielding (with conductive O-rings)
Optional Add-Ons
- Conductive O-Rings/EMI-shielding
- Metal-detectable O-rings
- PTFE-encapsulated O-rings
- FDA & USP-Class VI compounds
- Custom colors and sizes
- Cleanroom packaging
Need Custom O-Rings?
We provide precision-cut O-rings in both standard and custom configurations using advanced CNC cutting and measurement systems such as Zünd and Keyence. Whether you need prototype quantities or full production, we can help with:- Rapid turnaround
- Custom or non-standard sizes
- Small batch manufacturing
- Material selection support
- Engineering drawings & measurement reports
Conductive O-rings that seal and
shield in one part.
EMI O-rings are electrically conductive gaskets that hold a constant shield against electromagnetic interference while maintaining a full environmental seal. Metal-filled silicone and fluorosilicone compounds, fabricated to your exact dimensional requirements — plus the full elastomer range for precision sealing where conductivity isn’t the driver.
ISO 9001:2015 · ITAR Registered · AS568 · ISO 3601 · Made in USA
Shielding effectiveness
on conductive grades
AS568 · ISO · metric
& fully custom
Service range across
the elastomer set
Quote turnaround
no minimum order
Engineered
sealing stack
AS568 · ISO 3601 · custom
Up to 120 dB · conductive
Static & dynamic
±0.005″ std · ±0.002″ tight
24-hour quote · no minimum
A ring that shields,
a ring that seals.
EMI O-rings are made of specialty elastomers packed with metallic or metal-coated particles. The silicone base withstands a wide temperature range and provides environmental sealing; the conductive fill establishes the electrical path that shields the joint.
Interference escapes through the gaps between mating surfaces — a conductive O-ring closes them.
Under compression, the filled elastomer creates a continuous low-impedance path across a flanged or threaded joint, equalizing potential and routing induced currents to ground while sealing out the environment.
Where shielding isn’t required, the same O-ring geometry is converted from the full elastomer range — NBR, EPDM, FKM, FVMQ, PTFE, and FFKM — matched to the temperature, chemical, and pressure profile your application demands.
01
Shield and seal together
Metal-filled elastomer routes induced currents to ground across the joint while the same ring blocks moisture, dust, and pressure — one part, two functions.
02
Conductive filler system
Silver, silver-plated, and nickel-graphite particles packed into silicone or fluorosilicone binders deliver constant, low-impedance shielding under compression.
03
Static or dynamic sealing
A simple, cost-effective geometry that works in face, bore, and rod configurations — easy to install, easy to replace, proven across service life.
04
Cut to your dimensions
Die-free Zünd conversion and molded tooling produce AS568, ISO, and fully custom cross-sections — prototype through production, no minimum order.
The right elastomer
for the seal.
Selecting the correct material is critical to sealing reliability. We convert O-rings across the full elastomer range — the compound your application specifies is the compound we cut.
Nitrile Butadiene Rubber
The most common and cost-effective O-ring material — excellent oil, fuel, and hydrocarbon resistance with strong mechanical and abrasion properties.
Ethylene Propylene Diene Monomer
Excellent resistance to weathering, ozone, UV, steam, and polar fluids with good flexibility and aging characteristics.
Fluorocarbon
Excellent chemical, fuel, and oil resistance with strong high-temperature performance and good compression-set resistance.
Fluorosilicone
Silicone flexibility with improved fuel and oil resistance — stays flexible at low temperature with excellent UV, ozone, and weather resistance.
Polytetrafluoroethylene
Chemically inert to nearly all fluids, lowest friction of any solid, needs no lubrication, and holds across an extreme temperature range.
Perfluoroelastomer
The highest chemical resistance of any elastomer — near-universal compatibility with PTFE-like sealing, but retaining elastomeric recovery.
Material comparison — at a glance
Values are representative and vary with compound, cure, and application. Special FKM grades reach +300 °C; conductive silicone and fluorosilicone grades add EMI shielding to the sealing function. Send your service conditions — we’ll confirm the compound against temperature, media, and pressure.
Metal fills for
shielded seals.
For EMI O-rings, shielding performance and galvanic compatibility trace back to the conductive particle system. We stock the full range across silicone and fluorosilicone binders — matched to your enclosure and frequency band.
Ag-Al · MIL-DTL-83528 Type ASilicone or fluorosilicone110 dB to 10 GHzWorkhorse conductive O-ring fill — best balance of shielding, cost, and weight.
Ag-Cu · Type CSilicone binder120 dB to 10 GHzHighest volume conductivity for demanding RF sealing joints.
Ag-Glass · Type BSilicone binder105 dB to 10 GHzLightweight option where mass matters — airborne and space avionics.
Ni-Gr · Type MSilicone or fluorosilicone90 dB to 10 GHzCost-effective, corrosion-resistant fill for galvanic-sensitive joints.
Ag-NiSilicone binder110 dB to 10 GHzStrong shielding with improved compatibility against aluminum housings.
AgSilicone binder120 dB to 18 GHzMaximum performance for the most stringent RF and microwave seals.
Shielding effectiveness values are representative of conductive elastomer systems per modified MIL-DTL-83528 test method and vary with frequency, groove design, and compression. Send your specification — we’ll confirm the fill and performance against your joint.
Sealing built
to spec.
Published capability across conductive and non-conductive O-rings. Shielding, durometer, and environmental performance are verified against your groove design and service conditions.
Non-standard size?
We regularly deliver
custom O-rings beyond
catalog geometry.
Send your print and service conditions. If we can convert it, we’ll quote it.
Where our
O-rings seal.
From EMI-shielded defense enclosures to semiconductor process chambers, PNA O-rings seal — and where specified, shield — across programs where reliability is not optional.
01 / 06
Aerospace & Defense
- Avionics enclosure sealing
- EMI O-rings for shielded joints
- Fuel-system seals (FVMQ)
- Battle-harsh environments
02 / 06
Semiconductor
- Process chamber seals (FFKM)
- Vacuum sealing
- Aggressive-media resistance
- Cleanroom-packaged parts
03 / 06
Medical Devices
- FDA & USP Class VI compounds
- Static & dynamic sealing
- Sterilization-compatible
- Metal-detectable options
04 / 06
Automotive & EV
- Fuel & oil handling (NBR)
- Turbo systems (FVMQ)
- Battery enclosure seals
- EMI shielding O-rings
05 / 06
Chemical & Oil / Gas
- Aggressive chemical media
- High-pressure static seals
- PTFE & FFKM compounds
- Vacuum service
06 / 06
Electronics / EMI
- Conductive shielded joints
- RF enclosure sealing
- Threaded & flanged housings
- Ground-path continuity
Specify beyond
the standard ring.
Every O-ring can be tailored to the program — shielding, detectability, encapsulation, regulatory compounds, and packaging, called out on the same quote.
01 / 06
Conductive / EMI-shielding
Metal-filled silicone and fluorosilicone O-rings that add constant EMI shielding to the seal.
02 / 06
Metal-detectable
Detectable compounds for food, pharmaceutical, and cleanroom environments where fragment control matters.
03 / 06
PTFE-encapsulated
FKM or silicone core in a chemically inert PTFE jacket for near-universal media compatibility.
04 / 06
FDA & USP Class VI
Regulatory-compliant compounds for medical, food-grade, and biotech sealing applications.
05 / 06
Custom colors & sizes
Non-standard cross-sections, custom durometers, and color coding for part identification.
06 / 06
Cleanroom packaging
Cleaned, inspected, and packaged for semiconductor and medical device supply chains.
Custom compound
Something else?
If your spec calls for a compound or finish not listed here, send it — we’ll source and quote it.
Proficiencies
& performance.
Deep engineering capability, materials in stock, and a quality system built around defense and aerospace compliance from day one.
Field proven
Thousands of designs integrated into battle-harsh and commercially challenging environments — seals that hold up where it counts.
Proven track record
Orders delivered on time and to specification, from prototype quantities through full production runs.
Product of choice
Trusted for mission-critical applications across aerospace, rugged commercial, and automotive programs.
Deep engineering
Expert knowledge of EMI/RFI specifications and material selection, collaborating from concept through completion.
More from the
PNA capability set.
Conductive O-rings are one family on a single CAD-driven production floor. Explore the rest of what we convert.
01 / 06
Conductive elastomer shielding gaskets converted to print — silver, copper, and nickel-graphite fills per MIL-DTL-83528.
02 / 06
Gap pads, phase-change, and adhesive TIMs that dissipate heat and conform to uneven surfaces.
03 / 06
Conductive elastomer flange gaskets for avionics LRU sealing, radar modules, and enclosure joints.
04 / 06
High-performance environmental gaskets converted from silicone, EPDM, Viton, and neoprene grades.
05 / 06
Dielectric components cut from Nomex, Mylar, and Kapton for battery packs and HV enclosures.
06 / 06
Tier-one stocking relationships across the leading EMI, thermal, and sealing material manufacturers.
Need custom
O-rings? Quotes in 24 hours.
Include size or cross-section, material, durometer, quantity, and any shielding or compliance requirement. We’ll respond within 24 business hours with feasibility, lead time, and price.
Rapid turnaround · custom sizes · small-batch · measurement reports