FFKM Rubber O Ring Seal O-ring Perfluoroelastomer O-Rings Oring
Product Details
FFKM rubber O ring seal
,Perfluoroelastomer O-ring seal
,FFKM O-ring chemical resistant
FFKM (Simriz® Perfluoroelastomer) O-Rings
FFKM (Simriz®) O-Ring guide: temperature range, near-universal chemical resistance, honest limitations, standards, and every Freudenberg Simriz® compound we carry with what each grade is built for.
FFKM (perfluoroelastomer) is the highest-performance sealing elastomer available, combining near-universal chemical resistance with extreme heat resistance. The reason is structural: FFKM is built from perfluorinated monomers, meaning the polymer contains no hydrogen at all. Almost every chemical attack on a rubber starts by going after a hydrogen site. Take the hydrogen away and there is nothing left to grab. Getting there takes special monomers plus special compounding and processing, which is also why the material costs what it costs.
What you end up with is an elastomer whose media and temperature resistance surpasses FKM (Viton®) by a wide margin and comes very close to PTFE, while still behaving like rubber. Freudenberg calls it “elastic PTFE”, and that is the cleanest description anyone has written: PTFE chemistry with elastomer recovery and sealing force. Freudenberg Sealing Technologies supplies its perfluoroelastomer line under the Simriz® trademark and is the only vertically integrated FFKM O-Ring manufacturer in the world, controlling the material down to the monomers. Where every other elastomer runs out of chemical or thermal headroom, FFKM keeps sealing.
| Parameter | Value |
|---|---|
| Material Type | FFKM (Perfluoroelastomer) |
| Continuous Temperature | -25 C to 300 C (customizable) |
| Short-term Temperature | Up to 327 C (620 F) |
| Standard Hardness | 75 Shore A (custom available) |
| Tensile Strength | 10.3-13.8 MPa |
| Elongation at Break | 200-300% |
| Compression Set | <15% @ 200 C (ASTM D395) |
| Tear Strength | 25-45 kN/m (ASTM D624) |
| Colors | Black (custom colors available) |
| Standards | AS568, Metric, JIS, Custom |
| Certifications | RoHS |
FFKM (perfluoroelastomer) is classified under ASTM D1418 / ISO 1629 as a fully fluorinated elastomer. Compared to standard FKM (Viton), the fully fluorinated backbone of FFKM provides near-universal chemical inertness — including resistance to ketones, amines, and strong oxidizers that attack FKM.
- Resistant to 1,600+ chemicals: ketones, esters, amines, strong acids/bases, plasma gases
- Continuous service at 300 C, short-term to 327 C (620 F) — far beyond FKM at 220 C
- Ultra-low outgassing: meets semiconductor vacuum chamber requirements (10⁻⁸ Torr)
- Low compression set at elevated temperatures: maintains sealing force over extended service
- Near-PTFE chemical inertness + rubber elasticity = the true "ultimate elastomer"
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