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  • What about Kalrez O-Rings?

What about Kalrez O-Rings?

DuPont™ Kalrez® perfluoroelastomer parts (FFKM) resist over 1,800 different chemicals, while offering the high temperature stability of PTFE (327°C).

They’re used in highly aggressive chemical processing, semiconductor wafer fabrication, pharmaceutical, oil and gas recovery, and aerospace applications. The long-term, proven performance of Kalrez® parts can mean less frequent seal changes, repairs and inspections.

Comparison of O-Ring Materials

Each type has its advantages and disadvantages as listed in the chart below, and the type required depends on the O-Ring application.

Property Buna-N FKM Silicone PTFE Kalrez®
Tear Resistance Good Good Poor Excellent Good
Abrasive Resistance Good Good Poor Excellent Good
Ozone Resistance Poor Excellent Excellent Good Excellent
Weather Resistance Fair Excellent Excellent Good Excellent
Heat Resistance Fair Excellent Excellent Good Excellent
Chemical Resistance Fair Excellent Good Excellent Excellent
Oil Resistance Poor Excellent Poor Good Excellent
Acid Resistance Fair Excellent Good Excellent Excellent
Alkali Resistance Good Good Fair Excellent Excellent
Steam Resistance Fair Fair Poor Good Excellent
Minimum Usable Temp

-65 deg F

-54 deg C

-65 deg F

-54 deg C

-120 deg F

-85 Deg C

-110 deg F

-79 deg C

-20 deg F

-30 deg C

Maximum Usable Temp

300 deg F

150 deg C

500 deg F

260 deg C

450 deg F

232 deg C

500 deg F

260 deg C

600 deg F

316 deg C

Color Black Black Red White Black
Impermeability Fair Good Poor Excellent Good
Tensile Strength Good Good Poor Excellent Good

 

Kalrez is available in a small number of sizes, with other sizes available through special order. Check the O-Ring Special Materials sections of our website for in stock items 24/7 or call us at 1 (800) 445-7803.

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