- Excellent resistance/low volume swell in a wide range of wet chemistries (acids/bases)
- Excellent resistance to amine-based chemistries versus standard elastomers
- Low metals content
- Very good mechanical strength/compression set properties
- Wet etch tools
- Roller applications for wet inline tools
- Wet chemical management systems
- Filter, pumps, etc., for wet process applications
|Typical Physical Properties1|
|Hardness2 , Shore M (O-ring)||79|
|100% Modulus3 , MPa||7.85|
|Tensile Strength at Break3 , MPa||19.08|
|Elongation at Break3 , %||159|
|Compression Set4 , %
70 hr at 204 °C
|Maximum Service Temperature5, °C||230|
1 Not to be used for specification purposes
2 ASTM D2240 and D1414 (AS568 K214 O-ring test specimens)
3 ASTM D412 and D1414 (AS568 K214 O-ring test specimens)
4 ASTM D395B and ASTM D1414 (AS568 K214 O-ring test specimens)
5 DuPont proprietary test method
For many applications, low volume swell/weight gain (change) of elastomers is critical for proper equipment operation. Excessive swell/weight gain (change) may cause permanent seal failure due to equipment hang-up, extrusion, etc. While other physical property testing may be needed to adequately define product performance in a particular application, volume swell/weight gain (change) is an excellent indicator of resistance to chemical attack. Table 1 provides chemical resistance (% volume swell) test data for Kalrez® W240 in various acids, bases, solvents and water. Table 2 compares the weight gain and volume swell of Kalrez® W240 versus standard FKM in an amine-based chemistry.
Table 1: Chemical Resistance, % Volume Swell1,2
|Chemical||Exposure Time||Temperature (°C)||% Volume Swell Kalrez® W240|
|Nitric Acid (70%)||70||85||1|
|Nitric Acid (70%)||672||85||3|
|Sulfuric Acid (98%)||70||150||3|
|Sulfuric Acid (98%)||672||150||5|
1 ASTM D471 and D1414 (AS568 K214 O-ring test specimens)
2 Please consult a Daemar Application Engineer to asses performance fit in your specific application
Table 2: Amine-Based Chemistry Resistance (MEA: DMSO 70:30 Mixture)1,2
|Property||Kalrez® W240 % Volume Swell||Competitive FKM K7|
|Weight Change, %||1.0||Test Specimen Melted|
|Hardness Change, pts.||-3||Test Specimen Melted|
|Surface Condition After Exposure||No Surface Degradation||Test Specimen Melted|
1 MEA = Monoethanol Amine; DMSO = Dimethyl Sulfoxide
2 DuPont Proprietary Test Method: 14 days @ 80ºC
Download the Kalrez® W240 technical sheet.
Standard Kalrez® O-Ring Compounds
4079 perfluoroelastomer parts are a black, low compression set product for use in many dry and wet semiconductor process environments. It has excellent chemical resistance, good mechanical properties and outstanding thermal stability.
6375 is designed to give outstanding performance in the widest possible range of chemicals and temperatures. This product is an excellent choice for use in acids, bases, amines, steam, ethylene oxide, and many other aggressive chemicals.
7075 is designed for general-purpose use as O-rings or custom sealing components in the chemical and hydrocarbon processing industries. It is a carbon black-filled compound with mechanical properties designed for improved sealing performance in temperature cycling applications. 7075 has improved thermal resistance that extends maximum service temperature to 327 °C (620 F).
0090 perfluoroelastomer parts deliver durable, reliable sealing solutions for applications requiring excellent rapid gas decompression (RGD) properties as well as high hardness and high modulus properties. Some application areas include downhole equipment such as drilling and completion tools as well as industrial equipment including pumps and valves.
Specialty Kalrez® O-Ring Compounds
1050LF is a carbon black-filled product for O-rings, seals, and other parts used in chemical process industries. It has good hot water/steam, and excellent amine resistance. Kalrez® 1050LF is not recommended for use in organic acids, or inorganic acids at high temperatures.
6380 is a non-black product specifically developed for chemical processes involving hot, aggressive amines. It has also been successfully used in applications involving highly oxidizing chemicals. In addition, it has excellent overall chemical resistance. This cream colored product is easily identifiable when selecting an O-ring material for harsh chemical plant services.
7090 is a product for uses requiring higher hardness/higher modulus than more typical applications. Kalrez® 7090 perfluoroelastomer parts are well suited for both static and dynamic applications as well as specific sealing applications requiring extrusion resistance at high temperatures.
0040 -is a black product specifically designed for low temperature environments where significant chemical resistance is required. Kalrez® 0040 parts maintain elasticity and seal force at temperatures unattainable by other perfluoroelastomers.
Kalrez® is a registered trademark of E.I. du Pont de Nemours and Company or its affiliates