Parker FFKM Compounds: FF156, FF504-80, and FF252-75

FFKM Materials for Demanding Sealing Environments

When conventional elastomers reach their limits, FFKM (perfluoroelastomer) compounds can address applications that combine aggressive chemicals, elevated temperatures, and demanding sealing requirements. Pneu-Draulics supplies Parker FFKM products for industrial, oil and gas, chemical-processing, pharmaceutical, aerospace, and other specialized applications.

As a certified Parker Products supplier, Pneu-Draulics can help engineers compare Parker compounds around temperature, media compatibility, compression set, geometry, and applicable specifications. Parker’s FFKM portfolio includes FF156, FF504-80, and FF252-75, each developed around a different combination of environmental and application requirements.

Why Choose an FFKM Compound?

FFKM materials combine the chemical resistance associated with fluoropolymers with the elastic sealing behavior of an elastomer. They become useful when operating conditions exceed the capabilities of more conventional materials such as nitrile, EPDM, silicone, or standard FKM.

The correct FFKM compound still depends on the application. Engineers should consider:

• Operating temperature: Continuous and peak temperature exposure.
• Fluid chemistry: Acids, bases, fuels, oils, steam, solvents, and process chemicals.
• Compression set: The seal’s ability to retain sealing force over time.
• Industry requirements: Specifications, qualifications, or material approvals tied to the application.
• Seal geometry: O-rings, molded shapes, bonded seals, profiles, and other configurations.

Different FFKM formulations are not interchangeable, which makes compound-level selection important.

Parker FF156 for Broad Chemical Resistance and High Temperatures

Parker FF156 was introduced as an FFKM compound for applications that require both high-temperature stability and broad chemical resistance. It can operate at temperatures up to 527 °F (275 °C) and resists aggressive media such as acids, amines, hot water, ketones, aldehydes, esters, ethers, and aromatics.

These characteristics make FF156 relevant to demanding applications in chemical processing, oil and gas, pharmaceutical production, and other industrial environments. Potential uses include high-temperature reactors, downhole drilling equipment, exhaust and turbo systems, pumps, valves, mechanical seals, instrumentation, and high-purity filtration equipment.

Parker also lists USP Class VI approval for FF156, which makes the compound relevant where this specific material requirement applies. FF156 is available in O-rings, molded shapes, extruded profiles, and spliced configurations.

Parker FF504-80 for Extreme Chemical Service

Parker FF504-80 is a green, 80 Shore A FFKM compound developed for severe chemical and thermal environments. Parker documents a maximum operating temperature of 275 °C (527 °F) and compatibility with aggressive media such as bases, amines, steam, ethylene oxide, acids, and other chemicals.

Parker specifically identifies the following application areas for FF504-80:

• Chemical Process Industry (CPI).
• Exploration and Production of Oil and Gas (EOG).
• Paint spray applications.
• Other industrial environments with aggressive chemical exposure.

FF504-80 also exhibits strong compression-set resistance and is available in O-rings, molded shapes, gask-o-seals, and rubber-bonded seals.

For engineers working with particularly aggressive media, FF504-80 adds another Parker FFKM option beyond FF156. The choice between the two should follow actual fluid exposure, temperature, seal design, and application requirements rather than temperature rating alone.

Parker FF252-75 for Aerospace Applications

Parker FF252-75 is a black, 75-durometer FFKM compound developed for demanding aerospace environments. Parker states that the material exceeds the requirements of AMS 7257 and is AMS 7257 QPL listed. It is designed to withstand high temperatures and exposure to aerospace engine oil, fuel, and hydraulic fluids.

Key properties include:

• Recommended temperature range: 5 to 608 °F (-15 to 320 °C).
• Low compression set: Supports longer-term sealing performance under elevated temperature.
• Broad fluid resistance: Suitable for demanding aerospace oil, fuel, and hydraulic environments.
• Available forms: O-rings and customer-molded shapes.
• Aerospace qualification: AMS 7257 QPL listed.

Parker testing also documents FF252-75’s retention of mechanical properties after high-temperature and fluid-immersion exposure.

Unlike FF504-80, which Parker specifically positions for chemical processing, oil and gas, and broader industrial use, FF252-75 has a defined aerospace focus. Engineers should therefore select it where its published material properties and AMS 7257 qualification match the application.

Comparing Parker FF156, FF504-80, and FF252-75

All three products belong to Parker’s FFKM material family, but each addresses a different design priority.

This comparison should be treated as a starting point. Exact compound selection should consider the full operating environment, including media concentration, temperature cycles, pressure, seal geometry, and applicable specifications.

Get Parker FFKM Materials Through Pneu-Draulics

Pneu-Draulics works with engineers and procurement teams to identify sealing materials around the actual application rather than treating FFKM as a single generic material. As a certified Parker Products supplier, we can support applications that call for established products such as FF156 as well as newer Parker compounds such as FF504-80 and FF252-75.

Whether the requirement involves aggressive chemical exposure, oil and gas service, pharmaceutical processing, high-temperature equipment, or specification-driven aerospace sealing, Pneu-Draulics can help evaluate the compound, profile, and product configuration that best fits the application.

Contact Pneu-Draulics to discuss your FFKM sealing requirements or request Parker compound information for your next project.