O-Rings by Material
FFKM O-Rings (Perfluoroelastomer)
FFKM O-rings combine the chemical inertness of PTFE with the elastic recovery of a true elastomer — the ultimate sealing material for the most aggressive chemical and thermal environments.
Properties
Key Properties
| Property | Value |
|---|---|
| Temperature Range | −15 °C to +300 °C (+327 °C intermittent) |
| Hardness Range | 65 to 90 Shore A (75 Shore A typical) |
| Resists | Virtually all chemicals — strong acids, bases, ketones, esters, amines, steam, ethylene oxide, plasma, hot oils |
| Avoid | Molten alkali metals, elemental fluorine at high temperature (very few exceptions) |
| Typical Applications | Semiconductor fabrication (CMP, CVD, etch), pharmaceutical reactors, chemical processing, oil & gas (HPHT wells), aerospace, nuclear |
| Available Standards | AS568, ISO 3601, FDA 21 CFR 177.2600 (selected grades), USP Class VI (selected grades) |
For a complete material data sheet, see the full FFKM O-Rings material page.
Sizes
Available Sizes
FITCO manufactures FFKM O-Rings in all standard AS568 and metric sizes — from AS568-001 (0.74 mm ID) through AS568-475 (633.48 mm ID), plus metric sizes per ISO 3601, JIS B2401, and BS 1806.
- Standard durometers in stock
- Custom compounds and special durometers on request
- Cord stock available for field-cut rings
- Typical lead time: ex-stock for standard sizes, 2–4 weeks for custom
Resources
Related Pages
Full Material Data
Complete technical data sheet with chemical compatibility, compression set, and physical properties.
O-Ring Size Charts
AS568, Metric, JIS, BS, GB/T size tables with ID, OD, and cross-section dimensions.
Chemical Compatibility
Check material compatibility with your specific fluid or chemical environment.