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

At Ace Seal, we strive to help our customers get the material and products they need as soon as possible. We are aware of the long lead times for products that require Chemraz, Kalrez, and FFKM. Contact us today about alternative materials to Chemraz, Kalrez, and FFKM with reduced lead times.

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.