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

Dupont™ Kalrez® O-ring products are high-performing sealing products for secure applications. 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. With their strength and reliability, these O-rings offer a cost-effective alternative to metal O-rings.

As a trusted distributor of O-ring products, Ace Seal offers top-performing Kalrez® seals in standard O-ring sizes or custom configurations for your specific needs. Contact us to learn more or find the best solutions for your projects.

Shop Kalrez® Material O-Ring Products

Ace Seal offers Kalrez® O-rings in various styles and series. Find the right O-ring products for your applications below.


Features & Properties of FFKM Kalrez® O-Rings, Seals, & Gaskets

Physical properties of Kalrez® materials include a hardness of 75 for standard products and a range of 82 to 95 for specialty products. Kalrez® shares the same base monomer as Teflon®, making it a chemical-resistant, temperature-stable rubber. Kalrez® products include a maximum application temperature of up to 620°F for standard products and up to 617°F for specialty products. Industrial temperature processing ranges can reach temperatures of up to:

  • Chemical Processing: 620°F
  • Oil & Gas: 550°F
  • Food & Beverage Processing: 500°F
  • Pharmaceuticals: 500°F
  • Semiconductor: 617°F

Temperature ranges vary based on application and Kalrez® product. View our temperature compatibility chart for more information.

FFKM Kalrez® O-Ring Chemical Compound Characteristics

Specific physical properties of Kalrez® chemical compounds 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

Applications for Kalrez® Materials

With products including AS568 O-rings, Boss 900 Series O-rings, and Parker 500 Series O-rings, there are variations of Kalrez®  sealing products designed for several projects across various trades. Ideal for applications that require high performance in harsh environments, Kalrez® products are well-suited for a variety of applications across numerous industries, including:

  • Chemical Processing: Provides long-term embrittlement resistance and protection from swelling in abrasive environments.
  • Oil & Gas: Excellent corrosion resistance and durability against high temperatures and pressures.
  • Food & Pharmaceutical Processing: Offers heat and chemical resistance and contamination protection with FDA compliance.
  • Semiconductor: Offers exceptional chemical resistance and thermal stability.
  • Aerospace: Wide temperature processing range for demanding aerospace and aircraft applications.

Advantages of Dupont™ Kalrez® O-Rings

Kalrez® elastomer parts are designed for high-performance applications and can function with over 1,800 chemicals. Their versatility and longevity have made it a preferred FFKM for over 30 years. The enduring and established effectiveness of Kalrez® components reduces the need for frequent seal changes, repairs, and inspections, leading to enhanced process and equipment uptime. This results in improved operations and yield. Additional advantages of Kalrez® material usage include:

  • Increased productivity
  • Reduced maintenance costs
  • Maintained process purity
  • Increased safety

Alternatives for Kalrez® Materials

Kalrez® is a highly sought-after material for its many benefits and applications. As such, long lead times and increased costs are expected. However, there are several reliable alternatives to rival Kalrez® in functionality and results, with reduced lead times and cost-effective solutions.

Tecnoflon® is a suitable substitution for Kalrez® materials. It offers the highest performance levels among all FFKM elastomers and features extreme chemical resistance, allowing use across virtually all industries and applications. Specialty grades of Tecnoflon® can be applied to unique and demanding projects, making Tecnoflon® an underrated yet remarkable alternative to Kalrez®.

AFLAS® Premium PM-3000 and evolast® are additional FFKM elastomers that can be used in place of the highly demanded Kalrez® material. Ace Seal supplies a wide variety of FFKM products for superior performance in all sealing applications.

Contact Ace Seal for Dupont™ Kalrez® O-Ring Products

For over 35 years, Ace Seal has been a global, industry-leading supplier of rubber O-rings and custom molded parts. We offer a vast selection of FFKM Kalrez® O-rings, seals, and gaskets at the best prices. Our experts look forward to helping you find the best products for your sealing applications.

Contact us for more information about Kalrez® products, or request a quote to begin your sealing project today!