Kalrez®
Kalrez® — a Dupont trademark name — is a perfluoroelastomer like Chemraz®, Simriz®, Markez® or FFKM. Kalrez® resists over 1,800 different chemicals while offering the high-temperature stability of PTFE (327°C).
Standard Durometer & Colors
Kalrez® O-Rings typically have a standard durometer range of 70 to 90 Shore A, with 75 being the most common.
They typically are available in black, brown, and white, but some manufacturers will offer them in other colors.
Temperature Range for Kalrez® O-Rings
Kalrez® O-Rings have an operating temperature range from approximately -20°F to 600°F, with some grades capable of withstanding temperatures up to 620°F.
Recommended Use of Kalrez® O-Rings
Kalrez® O-Rings are recommended for a variety of applications that require exceptional chemical resistance and high-temperature stability.
- Chemical Processing
- Semiconductor Manufacturing
- Oil and Gas Industry
- Pharmaceutical and Food Processing
- Aerospace
- Industrial Applications
- Ultra-Pure Applications
- Mechanical Seals
Kalrez® O-Ring Benefits
The long-term, proven performance of Kalrez® parts can mean less frequent seal changes, repairs, and inspections, increasing process and equipment uptime for greater productivity and yield.
Kalrez® parts and seals also help prevent semiconductor process contamination by reducing particulates, lowering extractability, and resisting degradation in harsh plasma. Kalrez parts provide low outgassing in vacuum-sealing applications.
Additional Information for Kalrez® 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.
Kalrez® Compounds & Physical Properties
| Dupont Kalrez® Products |
Standard |
||
| 6375 | 7075 | 4079 | |
| Max temp °C | 275° | 327° | 316° |
| Max temp °F | 527° | 620° | 316 |
| Durometer Hardness Shore A, points +5 | 75 | 75 | 75 |
| Color | Black | Black | Black |
| Features | Excellent broad chemical resistance Hot water-Steam | High Temp. & Temp. Cycling | Excellent chemical resistance Hot Water / Steam |
| Dupont Kalrez® Products | Specialty | ||||
| 6380 | 7090 | 0090 | 0040 | 1050LF | |
| Max Temp °C | 225 | 325 | 250 | 220 | 288 |
| Max Temp °F | 437 | 617 | 482 | 428 | 550 |
| Durometer Hardness, Shore A, points +5 | 80 | 90 | 95 | 70 | 82 |
| Color | Cream | Black | Black | Black | Black |
| Features / Users | Resistance to highly oxidizing chemicals Processes involving harsh chemicals | Higher hardness-Excellent seal force retention-Resistance to higher temperatures. | Broad chemical resistance and high hardness | Designed for low temps | Good hot water/steam & excellent Amine resistance |