ETP-series Viton Extreme is a terpolymer of ethylene, tetrafluoroethylene (TFE) and perfluoromethylvinyl ether (PMVE) — chemically distinct from standard A/B/F-family FKM, not just a higher-fluorine version of it. Standard FKM's long-known weakness is attack by high-pH chemicals and amines; ETP closes that gap, giving FKM-family sealing performance in caustic and amine-exposed service where standard FKM degrades. It sits in similar chemical territory to AFLAS (FEPM) — FITCO's engineers can help choose between the two for your specific fluid.
| Temperature range | -20°C to +230°C |
|---|---|
| Hardness range | 70–90 Shore A |
| Relative cost | $$$$ |
| Resists | Strong bases, amines, steam, plus the hydrocarbon/fuel resistance typical of standard FKM |
| Avoid with | Same general limits as standard FKM outside its improved high-pH range |
| Standards | AS568 / ISO 3601 / BS 4518 |
Viton Extreme — ETP Series isn't a single formulation — the grade below matters as much as the base compound once your application gets specific.
The reference ETP-series compound — the entry point into Viton Extreme's amine and high-pH resistance for process seals where standard FKM has already shown degradation.
A refined-cure variant of the base ETP-S chemistry, specified where compression set performance needs to be tighter than the standard ETP-S grade delivers over long service intervals.
Not sure which sub-grade fits your application? Send us your fluid, temperature and pressure and our engineers will confirm — send an enquiry →
Physical property data — hardness, tensile strength, elongation, compression set and temperature resistance — tested to ASTM/ISO standards for each hardness grade FITCO stocks.
Full physical property data sheet — hardness, tensile strength, elongation at break, compression set and temperature resistance.
Download Datasheet →General-purpose seal for mineral oils, fuels and hydraulic fluids.
-20°C to +200°CHigh-temperature, chemical-resistant sealing for oil & gas and process industries.
-15°C to +327°CNear-universal chemical resistance for the most demanding process seals.
FEP encapsulated O-rings use standard Silicone or standard Viton FKM as the elastomer core — not specialty sub-grades. If you need FEP encapsulation, the core is standard FKM, not this specific grade.
Standard FKM details → Specialty ProductThin PTFE coating on the FKM O-ring surface — reduced assembly friction, anti-stick, dry lubrication for production line assembly without grease.
PTFE Coated O-Rings → Custom SizesNon-standard ID or cross-section? FITCO manufactures custom O-rings in all Viton grades to any dimension — send your drawing or ID × CS in mm.
Custom O-Ring sizes →Send us your fluid, temperature and pressure — our engineers will confirm the compound.
