Chemraz®
Chemraz® (FFKM) – (Green Tweed’s trademark name) Chemraz® is the Green Tweed version of Kalrez® (a Dupont trademark), Simriz® (a Simrit trademark), Markez® (a Marco Rubber trademark) or FFKM.
It is also a member of the perfluoroelastomer polymer family—polymers of three or more monomers in which all hydrogen positions have been replaced with fluorine. This complete state of fluorination results in outstanding resistance to heat and most chemicals and solvents.
Standard Durometer & Colors
Chemraz® O-Rings typically have a standard durometer range of 70 to 90 Shore A.
They typically are available in black, and white, as well as other colors like brown or tan, though these are less common.
Temperature Range for Chemraz® O-Rings
Chemraz® O-rings offer a broad temperature range, typically from -20°C to +260°C (-4°F to +500°F), making them suitable for both high and low-temperature applications. Certain grades of Chemraz can withstand temperatures up to +316°C (+600°F).
Recommended Use of Chemraz® O-Rings
Chemraz® O-rings are highly recommended for use in demanding environments where excellent chemical resistance and high-temperature stability are required. They are ideal for a variety of industries and applications, including:
- Chemical processing
- Pharmaceutical manufacturing
- Food and beverage production
- Oil and gas exploration and production
- Aerospace and aviation
- Semiconductor manufacturing
- Industrial machinery and equipment
- High-temperature sealing applications
Chemraz® O-Ring Benefits
Chemraz® O-rings offer exceptional chemical resistance, making them suitable for use with a wide range of aggressive chemicals. They provide outstanding high-temperature stability, maintaining their sealing integrity in temperatures up to +316°C (+600°F).
These O-rings also exhibit excellent compression set resistance, ensuring long-term reliability and performance. Additionally, Chemraz® O-rings are versatile, being compatible with various applications in multiple industries, including chemical processing, pharmaceuticals, and aerospace.
Additional Information for Chemraz® O-Rings
You can find additional technical information related to this and other materials regarding chemical compatibility, resistance to abrasion, suitability for dynamic or static applications, temperature operating ranges, longevity, and other factors on our Technical Information pages.
Chemraz® Compounds & Physical Properties
| Green Tweeds Chemraz® Products | 504 | 505 | 510 | 514/517 | 526 | 555 |
| Low Temp | -22°F | -22°F | -22°F | -20°F | 0°F | 10°F |
| High Temp | 446°F | 446°F | 446°F | 425°F | 500°F | 600°F |
| Features | Extremely broad range of chemical resistance | Broadest range of chemical resistance | Shore A hardness of 90-Broad range of chemical resistance | White for applications where contamination from carbon black must be prevented | Resistance to rapid gas decompressions | Wider operational band & superior compression set resistance |
| Green Tweeds Chemraz® Products | 562 | 564/566 | 600 | 605 |
615 |
SD625 |
| Low Temp | -40°F | -22°F | -4°F | 0°F | 0°F | -4°F |
| High Temp | 445°F | 428°F | 500°F | 500°F | 615°F | 500°F |
| Features | Excellent compression set resistance, steam & chemical resistance | Exceptional chemical resistance | Extremely broad chemical resistance range from a high-density base polymer |
High temp. compound, comparable to Chemraz® 505. Great for steam and water |
Can handle continuous operating temps up to 615° | Combines resilience and sealing force with an elastomer with chemical resistance & low extractable similar to PTFE |