Kalrez® O-Rings In Stock: What You Need to Know About FFKM Performance and Availability
Updated: Jul 31, 2025
When uptime matters, there's no room for delays. That's why Canyon Components offers Kalrez® O-rings in stock and ready to ship, helping manufacturers across industries avoid costly lead times and stay operational. Known as the gold standard in high-performance sealing, Kalrez® FFKM (perfluoroelastomer) compounds are engineered for extreme chemical and thermal environments. Whether you're maintaining a cleanroom, upgrading chemical processing equipment, or preparing for a semiconductor run, having Kalrez O-rings available when you need them is critical.
Why Kalrez® Is the Benchmark in FFKM Sealing
Developed by DuPont, Kalrez® FFKM O-rings are trusted worldwide for their exceptional sealing performance. Kalrez materials combine the chemical resistance of PTFE with the flexibility of rubber, making them ideal for extreme service conditions:
- Chemical resistance: Kalrez withstands a vast range of aggressive chemicals, including strong acids, amines, esters, and solvents.
- Thermal stability: Depending on grade, Kalrez can handle continuous service temperatures up to 335°C (635°F).
- Low outgassing: Specific Kalrez compounds meet stringent purity standards for semiconductor and pharmaceutical manufacturing.
- Compression set resistance: Maintains seal integrity under prolonged pressure and heat.
Kalrez compounds are available in formulations tailored for different industries, such as Kalrez® 8575 for plasma resistance in semiconductors, Kalrez® 6375 for broad chemical resistance, and Kalrez® 9100 for high-temperature stability in oil & gas. These materials have proven themselves in thousands of sealing applications across industries including aerospace, chemical processing, semiconductor fabrication, food and pharmaceutical manufacturing, and energy.
The Problem with Long Lead Times
Kalrez is often a made-to-order product, and many suppliers require weeks or even months to fulfill orders. That creates major problems when you're facing:
- Unplanned downtime that requires immediate replacement parts
- Last-minute maintenance turnarounds with no room for procurement delays
- Project delays that result from waiting on sealing components to arrive
At Canyon Components, we solve this by stocking select Kalrez O-ring sizes and materials for rapid shipment. We understand the urgency and deliver what you need, when you need it. Our in-stock Kalrez inventory helps reduce lead times from weeks or months to hours or days, allowing your team to maintain productivity and avoid costly disruptions.
Kalrez Compounds and Their Applications
Kalrez® 4079
Kalrez® 4079 is a carbon-black-filled perfluoroelastomer offering excellent chemical resistance and mechanical stability up to 315°C (with short excursions above). It’s a versatile, general-purpose material used in O-rings, diaphragms, seals, gaskets, and custom parts across diverse industries.
- Excellent low swell in organic/inorganic acids and aldehydes, with strong temperature cycling resilience
- Outstanding hot-air ageing properties and very low, stable compression set at high temperatures
- Suitable for ~95% of sealing needs but not for water/steam, aliphatic amines at high heat, or ethylene/propylene oxide applications
Kalrez® 6375
Often selected for chemical processing, Kalrez 6375 delivers broad chemical resistance against acids, bases, amines, steam, and more. It is ideal for:
- Pumps, valves, and mechanical seals
- Agitators and reactors
- Chemical loading and unloading stations
Kalrez® 9100
Kalrez 9100 is designed for harsh high-temperature environments, such as oil and gas exploration and refining. It is ideal for:
- Downhole tool sealing
- High-temperature static and dynamic applications
- Sour gas (H2S) resistance in oilfield equipment
No matter which Kalrez grade you need, having access to inventory is key to keeping your process running smoothly. Learn more about other Kalrez materials here.
Canyon Components: Kalrez In Stock and Ready to Ship
Canyon Components maintains inventory of popular Kalrez grades and AS568 sizes. Whether you're looking for Kalrez 4079, 6230, 7375, 6380, 0040, 0090, 6375, 9100, 6221, 1050LF, 8475, 8575, 3018, or other specialty formulations, our team can help match your application and ship fast.
- Kalrez 4079: Excellent thermal stability and good chemical resistance for broad applications
- Kalrez 6375: Universal chemical compatibility for chemical processing and manufacturing
- Kalrez 9100: Extreme high-temperature resistance and H2S tolerance for oil & gas
We also offer:
- Same-day shipping for in-stock Kalrez O-rings
- Application engineering support to identify the right grade for your process
- Custom quotes for low-volume or hard-to-find Kalrez part numbers
Our inventory is supported by a responsive team that understands both the urgency and technical specifications required to make the right decision quickly.
Kalrez® vs. Other FFKMs: What Makes It Special?
Kalrez isn't the only FFKM available, but it sets the standard. Other FFKM brands, like Chemraz®, Isolast®, Simriz®, and our own Canrez® line, offer similar base chemistry with differences in formulation, availability, and cost. Here's a quick comparison:
| Feature | Kalrez® | Canrez® | Chemraz® |
|---|---|---|---|
| Brand legacy | Original FFKM since 1970s | Engineered alternative | Known alternative |
| Temp. resistance | Up to 327°C | Up to 335°C | Up to 316°C |
| Chemical compatibility | Outstanding | Outstanding | Outstanding |
| Purity grades for semi | Yes | Yes | Yes |
| Availability | Available in some sizes. Often backordered | Readily available in almost any size | Available in some sizes. Made to order |
| Cost | Expensive | Extremely Competitive | Expensive |
While Kalrez commands a premium price, it is often specified by name in critical applications where any substitute requires customer or regulatory approval. When you need traceable Kalrez with manufacturer certifications, it pays to work with a supplier that has it in stock.
If your application allows for alternative FFKMs, Canyon Components can also supply our Canrez® line; a cost-effective, high-performance alternative that is also available with short lead times.
Frequently Asked Questions About Kalrez O-Rings
What sizes of Kalrez O-rings do you stock?
We carry many common AS568 sizes in Kalrez 4079, 6375, 9100, and other Kalrez compounds. Contact our team to check real-time inventory, or check our our online store.
Can you provide certification with Kalrez O-rings?
Yes. Kalrez O-rings from Canyon Components can be supplied with full traceability and certificates of conformance upon request.
Do you ship internationally?
Yes. We support global customers and can coordinate rapid export shipping and documentation for international deliveries.
Do you offer alternatives to Kalrez?
Yes. Canyon Components offers Canrez® FFKM O-rings that offer excellent chemical and temperature resistance at a lower price point. These can sometimes be used as drop-in replacements, depending on your requirements.
How to Request Kalrez® O-Rings
Need Kalrez fast? Here's how to get started:
- Check your existing part number (e.g., Kalrez 6375, AS568-214)
- Request a Quote with your material and size requirements
- Our team will confirm stock availability and shipping options
Need help identifying the right Kalrez grade or cross-referencing a competitor part number? Our technical team is ready to assist. We can also help with:
- Kalrez groove compatibility
- Substituting Kalrez for other elastomers
- Matching Kalrez part numbers to similar Canrez® options
Conclusion
Kalrez® FFKM O-rings are critical for high-performance sealing in harsh environments, and Canyon Components has them in stock and ready to ship. Don’t let your operation stall while waiting weeks for delivery. With our stocked inventory and technical support, you can get the Kalrez parts you need fast. Reach out today to check availability and secure the sealing performance your system demands.
