Perfluoroelastomer · FFKM

Perfluoroelastomer
Sealing for the extreme.

Aperflu® FFKM compounds combine the near-universal chemical resistance of PTFE with the resilience of an elastomer — delivering reliable, long-life sealing where conventional rubbers fail.

Engineered for semiconductor, chemical processing, energy and aerospace service at continuous temperatures up to 300 °C.

View Grade Data About Aperflu

300_°C

Continuous service temperature

6_%

Lowest compression set (200 °C × 70 h)

23.1_MPa

Peak tensile strength

Grades across the full duty range

FFKM Perfluoroelastomer
ASTM D1418 / ISO 1629

Product Overview

What is Aperflu FFKM

Aperflu® is a family of high-performance perfluoroelastomers (FFKM). In the polymer backbone every hydrogen atom is replaced by fluorine, forming highly stable C–F bonds, while perfluorinated ether side groups provide the low-temperature flexibility and elasticity essential to a rubber.

Extreme temperature capability

Grade system covers 200–300 °C post-cure and service windows, verified by compression-set testing at up to 300 °C × 70 h.

Near-universal chemical resistance

Effectively inert to acids, alkalis, solvents, amines, plasma and the majority of process media.

Low compression set

As low as 6% after 200 °C × 70 h and 17% at 300 °C × 70 h — seals stay live for the long term.

High mechanical strength

Tensile strength up to 23.1 MPa with hardness options from 68 to 74 Shore A for a wide range of seal designs.

Assorted Aperflu FFKM O-rings — Standard O-rings · AS568 & metric

Large-diameter FFKM O-rings — Large-diameter O-rings

FFKM seal rings in assorted sizes — Seal rings · custom sizes

Key Performance

Performance at a glance

Typical values from the Aperflu FFKM datasheet — tested to GB/T and ASTM standards.

300°C

Heat resistance

Aperflu 3075 validated at 300 °C × 70 h, with short-term peaks above this level.

23.1MPa

Tensile strength

Aperflu 2675 delivers the family's highest tensile strength with 180% elongation — a balanced package.

Compression set

Aperflu 2675 shows just 6% set after 200 °C × 70 h — outstanding sealing recovery.

68–74Shore A

Hardness range

Multiple hardness options for O-rings, gaskets, valve seats and other seal geometries.

224%

Maximum elongation

Aperflu 3175 stretches to 224% — ideal for wide-tolerance grooves and complex assembly.

Low-set flexibility

Aperflu 3275 pairs an 8% compression set with 145% elongation — stable yet compliant.

Grades & Data

Grade data sheet

Five compounds, complete property set — tested to GB/T and ASTM standards.

Compound	Primary cure	Post-cure	HardnessShore A · GB/T 39693.4 / ASTM D2240	TensileMPa · GB/T 528 / ASTM D412C	Elongation% · GB/T 528 / ASTM D412C	Compression set% · GB/T 7759.1 / ASTM D395 M-B	Set test conditions
Aperflu 2675 Low set · High strength	150 °C × 20 min	250 °C × 4 h	74	23.1	180	6	ASTM Type 1 button, 70 h @ 200 °C
Aperflu 3175 High elongation	170 °C × 12 min	290 °C × (8+16) h	72	18.3	224	21	25% deflection, O-ring #214, 70 h @ 200 °C (ASTM D395 Method B)
Aperflu 3275 Low compression set	170 °C × 20 min	290 °C × (8+16) h	68	19	145	8	25% deflection, O-ring #214, 70 h @ 200 °C (ASTM D395 Method B)
Aperflu 2275 General purpose	160 °C × 15 min	230 °C × 4 h	70	21.2	160	16	200 °C × 70 h
Aperflu 3075 High temperature	170 °C × 20 min	290 °C × (8+16) h	70	21.5	160	17	300 °C × 70 h

Values shown are typical and intended for selection guidance; lot-specific properties are subject to the certificate of analysis. Cure systems and filler packages can be customised on request.

Applications

Where Aperflu works

Wherever conventional fluoroelastomers give up, that is where Aperflu earns its place.

Semiconductor

O-rings for wafer etch, CVD and plasma tools — resisting plasma attack and aggressive process gases.

Chemical & Pharma

Dynamic and static seals for pumps, valves and reactors — no swelling in strong acids, alkalis or solvents.

Energy & Oil & Gas

Downhole, steam and H₂S-containing service — meeting heat and chemical attack at the same time.

Aerospace

Engine-adjacent and fuel-system seals holding reliable rebound across wide temperature and media excursions.

Why Aperflu

Built for the seals you cannot afford to replace

Downtime in a fab, a refinery or a flight-critical system costs far more than the seal itself.

Longer service intervals

Low compression set at 200–300 °C means seals keep their recovery — fewer unplanned shutdowns.

Media-proof by design

A fully fluorinated backbone shrugs off the acids, amines and solvents that destroy FKM and other rubbers.

A grade for every duty

From low-set static sealing to high-elongation dynamic grooves — pick the compound that matches the duty, not the other way round.

PerfluoroelastomerSealing for the extreme.