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Sealing material

FFKM (Kalrez)

Perfluoroelastomer — near-universal chemical resistance plus extreme heat — for the harshest sealing environments.

Chemical resistance approaching PTFE with elastomeric recovery — the highest-performance sealing elastomer for critical, no-fail service.

Service temp +5°F to +500°F (-15°C to +260°C)

Overview

What FFKM is best at

FFKM (Kalrez is a DuPont trade name) is fully fluorinated, with chemical resistance approaching PTFE while retaining elastomeric recovery. It withstands aggressive acids, bases, solvents, amines and steam at temperatures well beyond FKM. It’s the highest-performance — and highest-cost — sealing elastomer, reserved for critical applications.

Standout resistanceHeatOzone & weatherOil & fuelAcidsSolvents / ketonesWater & steamCompression setAlso strong inAbrasion
Continuous service temp+5°F to +500°F (-15°C to +260°C)
Hardness65–95 Shore A
Tensile strength1,500–3,000 psi
HeatExcellent
Low temperaturePoor
Ozone & weatherExcellent
Oil & fuelExcellent
AcidsExcellent
Solvents / ketonesExcellent
Water & steamExcellent
AbrasionGood
Compression setExcellent

Typical published ranges — final properties depend on the specific ARC compound, cure system and fillers. Request a compound-specific data sheet for design values.

Where it's used

Typical applications by industry

Semiconductor

Wafer-process chamber, valve and RF seals exposed to plasma and aggressive chemistries.

Chemical Processing

Pump, valve and reactor seals for mixed and aggressive media.

Oil & Gas

Extreme sour-service and high-temperature downhole seals.

Pharmaceutical

High-purity process seals for CIP/SIP and aggressive cleaning agents.

Choose FFKM when

  • Mixed or aggressive chemicals, or extreme heat, where other elastomers fail
  • Critical seals where downtime or contamination cost dwarfs seal cost

Consider an alternative when

  • Cost-sensitive applications within FKM's envelope → FKM
  • Very low-temperature service → silicone or fluorosilicone

Need FFKM parts to spec?

Send your service conditions or drawing — our engineers will confirm the right FFKM compound and a path to production.

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