Perfluoroelastomer

STANDARDASTM D1418FORMO-ring, seal, liningTrade namesKalrez, Chemraz

The top-class seal material, combining near-PTFE chemical resistance with elastomeric flexibility. For aggressive chemical and high-temperature service that no other elastomer withstands.

HARDNESS: Shore A 70–90
LOW-TEMPERATURE FLEXIBILITY °C: depends on compound
TEMPERATURE: −15 … +320 °C
COST

Representative sample of FFKM: O-ring and sheet specimen — REPRESENTATIVE IMAGE · Colour is an industry habit; do not identify the material by its colour.

Chemical compatibility

Mechanical properties

TYPE	Heat resistance °C	Low-temperature flexibility °C	Typical hardness
General-purpose compound	≈ 320	depends on compound	Shore A 70–90

Service temperature

−15 °C+320 °C−200−1000100200300400500600700800

Media suitability GENERAL TREND

Water

Steam

Mineral oil

Fuel, aliphatic HC

Ozone, outdoor

Dilute acid

Caustic

Ketones, esters

Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.

Strengths and weaknesses

Strengths

Almost universal chemical compatibility
The highest temperature among elastomers
Long maintenance intervals

Weaknesses

Very expensive (dozens of times the price of FKM)
Limited low-temperature flexibility

Manufacturing and use

ECONOMY: Very high.
MANUFACTURING METHODS: Moulding (compression, injection) · Vulcanization
TYPICAL VALVE PARTS: O-ring · Seal (critical service)

Source: ASTM D1418. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.