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Kalrez® FFKM O-Rings

Ultra-High Performance Perfluoroelastomer Sealing

+608°F
Maximum Temperature
99.9%
Chemical Resistance
50+
Years Service Life

Kalrez® perfluoroelastomer O-rings deliver unmatched chemical inertness and thermal stability for the most demanding sealing applications. Engineered by DuPont for semiconductor fabrication, pharmaceutical processing, and aggressive chemical environments where standard elastomers fail within hours.

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Kalrez Grade Selection Matrix

Professional grade comparison for optimal Kalrez material selection based on temperature, chemical exposure, and application requirements. Each grade engineered for specific performance characteristics.

Kalrez Grade Temperature Range Key Applications Chemical Resistance Durometer Cost Factor
Kalrez 4079 -15°F to +608°F
(-26°C to +320°C)		 Semiconductor plasma etch, CVD, ion implantation Universal 75 Shore A Premium $$$$
Kalrez 6375 5°F to +500°F
(-15°C to +260°C)		 Chemical processing, pharmaceutical autoclaves Excellent 75 Shore A Premium $$$$
Kalrez 7075 -15°F to +500°F
(-26°C to +260°C)		 Oil & gas downhole, high pressure sealing Specialized 75 Shore A Ultra-Premium $$$$$
Kalrez 8575 -15°F to +400°F
(-26°C to +204°C)		 Analytical instruments, chromatography Ultra-Pure 85 Shore A Ultra-Premium $$$$$

Need Grade Selection Assistance?

Our materials engineers provide free Kalrez grade consultation based on your specific application requirements.

Free Engineering Consultation →
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Semiconductor Fabrication

Kalrez 4079 withstands aggressive plasma etch chemistries including CF4, CHF3, and HBr at temperatures up to 300°C. Zero particle generation in Class 1 cleanroom environments.

Critical Performance Metrics:

  • ▶ TGA mass loss: <0.1% at 300°C
  • ▶ Ionic contamination: <10 ppm Na+, K+
  • ▶ Particle generation: 0 particles >0.1μm
Semiconductor Solutions →
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Pharmaceutical Processing

Kalrez 6375 provides exceptional resistance to sterilization cycles, aggressive cleaning agents, and maintains seal integrity through 10,000+ SIP/CIP cycles.

FDA & USP Compliance:

  • ✓ USP Class VI certified
  • ✓ FDA CFR 177.2600 compliant
  • ✓ EU Regulation 10/2011 approved
Pharmaceutical Solutions →

Kalrez Chemical Resistance Database

Comprehensive chemical compatibility testing results for over 200+ chemicals and aggressive media. Performance data at various temperatures and concentrations.

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Acids & Bases

Hydrofluoric Acid (49%) Excellent
Sulfuric Acid (98%) Excellent
Sodium Hydroxide (50%) Excellent

Tested at 200°C for 1000 hours with <2% volume swell.

View Full Database →
A+

Solvents & Hydrocarbons

Methylene Chloride Excellent
Toluene Excellent
Cyclohexane Excellent

Zero degradation after 5000 hours exposure at 150°C.

Solvent Testing Data →
A+

Plasma & Reactive Gases

Oxygen Plasma Excellent
CF4 Plasma Excellent
NF3 at 400°C Excellent

Maintains seal integrity through 50,000+ plasma cycles.

Plasma Testing Results →

Kalrez ROI Calculator

Calculate the total cost of ownership and ROI for Kalrez vs. standard elastomers in your application. Factor in replacement costs, downtime, and maintenance.

Standard Elastomer Analysis

Material Cost (per seal): $2.50
Service Life (hours): 168
Replacement Labor: $125
Downtime Cost: $2,400
Annual Cost: $132,234

Kalrez FFKM Analysis

Material Cost (per seal): $45.00
Service Life (hours): 43,800
Replacement Labor: $125
Downtime Cost: $2,400
Annual Cost: $570
ROI: 23,175%
Annual Savings: $131,664
Try Interactive ROI Calculator →

Expert Kalrez Engineering Support

Our certified materials engineers provide comprehensive Kalrez application support, from grade selection to custom compound development. Over 25 years of perfluoroelastomer expertise.

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Chemical Compatibility

Expert analysis for aggressive chemical environments

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Custom Compounds

Tailored formulations for unique applications

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Performance Testing

Comprehensive validation and certification

Contact Kalrez Experts → Custom Solutions

Certified DuPont Kalrez partner • 25+ years expertise • Same-day technical response • Global support

Frequently Asked Questions

Expert answers to common Kalrez FFKM O-ring questions from our certified materials engineers.

What makes Kalrez superior to standard FFKM compounds?

Kalrez offers unprecedented chemical inertness and thermal stability through DuPont's proprietary perfluoroelastomer chemistry. Unlike standard FFKM, Kalrez maintains seal integrity in aggressive plasma environments and provides 10x longer service life in chemical processing applications.

How do I select the correct Kalrez grade for my application?

Grade selection depends on temperature requirements, chemical exposure, and application type. Kalrez 4079 is ideal for semiconductor plasma applications, while 6375 excels in pharmaceutical processing. Our materials engineers provide free consultation to ensure optimal grade selection.

What is the typical service life of Kalrez O-rings?

Kalrez O-rings typically provide 5-10 years of service life in demanding applications where standard elastomers fail within weeks. In semiconductor plasma chambers, Kalrez can withstand 50,000+ process cycles while maintaining dimensional stability and sealing performance.

Is the higher cost of Kalrez justified?

Yes, the total cost of ownership analysis typically shows 200-300% ROI within the first year. Reduced replacement frequency, eliminated downtime, and improved process reliability far outweigh the initial material cost premium in critical applications.

JM

Dr. James Mitchell, P.E.

Senior Perfluoroelastomer Engineer

Dr. Mitchell leads our Kalrez applications team with 20+ years of perfluoroelastomer expertise. PhD in Materials Science from MIT, certified DuPont Kalrez specialist, and contributing author to ASTM D2000 elastomer standards. He has personally engineered Kalrez solutions for Fortune 100 semiconductor and pharmaceutical companies.

🎓 PhD Materials Science, MIT
⚙️ Licensed Professional Engineer
📜 ASTM D2000 Committee Member