Kalrez FFKM O-Rings Supplier

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kalrez o-rings

Kalrez® – (a Dupont trademark name) is perfluoroelastomer like Chemraz®, Simriz®, Markez® or FFKM. Kalrez® resists over 1,800 different chemicals while offering the high-temperature stability of PTFE (327°C).

Industries & Applications

Kalrez parts are used in highly aggressive chemical processing, semiconductor wafer fabrication, pharmaceutical, oil and gas recovery, and aerospace applications.

Kalrez Oring Benefits

The long-term, proven performance of Kalrez® parts can mean less frequent seal changes, repairs, and inspections, increasing process and equipment uptime for greater productivity and yield. Kalrez® parts and seals also help prevent semiconductor process contamination by reducing particulates, lowering extractable, and resisting degradation in harsh plasma. Kalrez parts provide low outgassing in vacuum-sealing applications.

You can find additional technical information related to this and other materials regarding chemical compatibility, resistance to abrasion, suitability for dynamic or static applications, temperature operating ranges, longevity, and other factors on our Technical Information pages.

Kalrez® Compounds & Physical Properties

Dupont Kalrez® Products

6375 7075 4079
Max temp °C 275° 327° 316°
Max temp °F 527° 620° 316
Durometer Hardness Shore A, points +5 75 75 75
Color Black Black Black
Features  Excellent broad chemical resistance Hot water-Steam High Temp. & Temp. Cycling Excellent chemical resistance Hot Water / Steam


  Dupont Kalrez® Products Specialty
 6380 7090 0090 0040 1050LF
Max Temp °C  225 325 250 220 288
 Max Temp °F 437 617 482 428 550
 Durometer Hardness, Shore A, points +5  80 90 95 70 82
 Color Cream Black Black Black Black
Features / Users  Resistance to highly oxidizing chemicals Processes involving harsh chemicals  Higher hardness-Excellent seal force retention-Resistance to higher temperatures.  Broad chemical resistance and high hardness  Designed  for low temps  Good hot water/steam & excellent Amine resistance


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