Ace Seal is a global manufacturer of custom o-rings, seals, gaskets and other molded rubber & plastic components

Dupont™ Kalrez® O-Rings

  • o-ring inside and outside measurement diagram

As a trusted Kalrez® distributor, Ace Seal offers these top-performing seals are offered in standard O-ring sizes or custom cut for your specific application needs.

Kalrez® O-Ring Products Include:


With high temperature stability and chemical resistance for over 1,800 different chemicals, Dupont™ Kalrez® o-rings, seals, and gaskets provide the high-performance and versatility needed in an effective elastomer. Because of its strength and reliability, these O-rings offer a cost-effective alternative to metal O-rings.

FFKM Kalrez® O-Ring Characteristics

  • Chemical processing temperature range: up to 620° F°
  • Oil and gas industry applications temperature range: up to 550° F
  • Food and pharmaceutical application temperature range: up to 500° F
  • Semi-conductor applications temperature range: up to 617° F

Temperature ranges depend on the application uses as well as Kalrez® product type.

FFKM Kalrez® O-Ring Chemical Compound Characteristics

As a perfluoroelastomer, Kalrez® is ideal for hydrocarbon and chemical processing. Specific Kalrez® physical properties include:


Kalrez ®Compounds Available from Ace Seal

Temperature Range


Application Uses

Kalrez® 6375


Max temperature of 527°F

  • Carbon-black filled
  • Ideal for general o-ring use
  • Mixed process streams
  • Recommended for use in steam, ethylene oxide, and propylene oxide

Kalrez® 7075


Max temperature of 620°F

  • Low compression set
  • Improved seal force retention
  • Has glossy finish
  • Designed for chemical and hydrocarbon uses

Kalrez® 4079


Max temperature of 600°F

  • General purpose, low compression set
  • Excellent chemical resistance
  • Ideal for aircraft
  • Not recommended for hot water/steam applications

Kalrez® 6380


Max temperature of 437°F

  • Non-black, cream color
  • For chemical processes using hot amines
  • Ideal for applications in oxidized chemicals

Kalrez® 7090


Max temperature of 617°F

  • Excellent thermal properties
  • Excellent mechanical properties
  • Resistant to temperature cycling effects
  • Ideal for higher hardness applications
  • Suited for applications requiring high-temperature extrusion resistance

Kalrez® 0090


-5.8°F to 482°F

  • Resistant to extrusion and gas decompression


  • Ideal for industrial equipment like pumps and valves

Kalrez® 0040


-43.6°F to 428°F

  • Maintains elasticity in low temperatures
  • Ideal for low temperature environments
  • Works well for couplings or applications requiring chemical resistance

Kalrez® 1050LF


Max temperature of 550°F

  • Good hot water and amine resistance
  • Not recommended for organic acid use at high temperatures
  • Ideal for door lids
  • Drain seals
  • Fittings
  • Flow meters

Properties of Kalrez® O-Ring, Seals, and Gaskets

General properties for Kalrez® products include a maximum application temperature up to 620° F for standard products and up to 617° for specialty products. Additional physical properties include a hardness of 75 for standard products and range from 82 to 95 for specialty products. Kalrez® shares the same base monomer as Teflon®, making it a chemical resistant, temperature stable rubber.

Kalrez® Rubber Application Uses

Ideal for applications that require high-performance in harsh environments, Kalrez® products are well-suited for a variety of applications including:

  • Semiconductor applications. Kalrez® parts provide exceptional chemical resistance and thermal stability for semiconductor applications.
  • Chemical processing applications. Provides long-term swelling and embrittlement resistance in abrasive environments.
  • Food and pharmaceutical applications. Offers heat and chemical resistance with contamination protection. Specific Kalrez® compounds are FDA compliant.
  • Aerospace. With a wide temperature range, Kalrez® parts can withstand the demands of aerospace and aircraft applications.
  • Oil and Gas. The composition of FFKM Kalrez® rubber make it an excellent choice for corrosion resistance and durability against high temperatures and pressures.

Advantages of FFKM Kalrez® Rubber O-Rings

Dupont™ Kalrez® elastomer parts are designed for high-performance applications. Their versatility and longevity have made it a preferred FFKM for over 30 years. Additional advantages include:

  • Increase productivity
  • Reduce maintenance costs
  • Maintain process purity
  • Increase safety

In addition to our Kalrez® O-rings, we also offer a wide variety of standard and custom O-ring products.

Order Your FFKM Kalrez® O-Rings Today

For over 35 years, Ace Seal has been a global, industry-leading supplier of O-rings and custom molded parts. We offer a vast selection of FFKM Kalrez® o-rings, seals, and gaskets at the best prices.


Discuss your Kalrez® needs with us or request a quote today.