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In pharmaceutical and food processing sealing applications where cleanliness is critical, PTFE has been the material of choice, until now. DuPont™ Kalrez® perfluoroelastomer parts offer the same level of cleanliness and universal chemical resistance, but unlike PTFE they have true elastomeric properties and sealing capabilities.
FDA-compliant Kalrez® 6221 and 6230 parts provide low contamination from extractables. They are well-suited for contact with highly pure and aggressive water (WFI) systems and exhibit very low swell and loss of mechanical properties after repeated steam cycling.
The table below lists the chemical compatibility of Kalrez® perfluoroelastomer parts and other elastomers used as sealing materials in the pharmaceutical and food handling industries.
Elastomer Chemical Compatibility*
| Chemical |
Kalrez® 6221/6230 |
EPDM |
SI |
FKM |
| Acetic Acid |
A |
A |
A |
B |
| Acetone |
A |
A |
C |
U |
| Citric Acid |
A |
A |
A |
A |
| Hydrogen Peroxide |
A |
B |
B |
B |
| Isopropyl Alcohol |
A |
A |
A |
A |
| Methyl Ethyl Ketone |
A |
A |
U |
U |
| Mineral Oil |
A |
U |
B |
A |
| NaOH |
A |
A |
B |
B |
| Nitric Acid |
A |
B |
B |
A |
| Sodium Hydrochlorite |
A |
B |
B |
A |
| Soybean Oil |
A |
C |
A |
A |
| Steam (<150°C [302°F]) |
A |
A |
C |
U |
| Steam (>150°C [302°F]) |
A |
C |
U |
U |
| Toluene |
A |
U |
A |
A |
| Xylene |
A |
U |
U |
A |
| Maximum Service Temp |
260°C (500°F) |
135°C (275°F) |
200°C (392°F) |
200°C (392°F) |
A = Little or no effect
B = Slight swelling and/or loss of physical properties
C = Moderate to severe swelling and/or loss of physical properties / limited functionality
U = Not suitable or recommended
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DuPont is the only supplier that manufactures both the perfluoroelastomer polymer and the Kalrez® finished parts. We provide full traceability—an attribute that is highly desirable for your critical applications. We offer parts in standard shapes and can also produce custom shapes.
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