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Kalrez® 6221

Sold by DuPont
Polymer Name: Perfluoroelastomer (FFKM)
Physical Form: Seals, O-rings
Features: Low Contamination From Extractables, Chemical Resistant, Good Steam Cycling Resistance
End Uses: Semiconductor Applications, O Rings
Color: White
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TypeDocument Name
Other
Kalrez® Safe Handling Guidelines (Japanese)
Kalrez® Safe Handling Guidelines (Japanese)
Other
Brochure
Kalrez® - Contamination considerations for perfluoroelastomer seals used in deposition processes
Kalrez® - Contamination considerations for perfluoroelastomer seals used in deposition processes
Brochure
Brochure
Kalrez® Brochure
Kalrez® Brochure
Brochure
Brochure
Kalrez® Perfluoroelastomer parts Statement of Compliance for Pharmaceutical, Biotech, Food and Beverage Applications
Kalrez® Perfluoroelastomer parts Statement of Compliance for Pharmaceutical, Biotech, Food and Beverage Applications
Brochure
Technical Data Sheet
Kalrez® 6221 Technical Data Sheet
Kalrez® 6221 Technical Data Sheet
Technical Data Sheet
Other
Kalrez® Perfluoroelastomer Parts
Kalrez® Perfluoroelastomer Parts
Other
Brochure
Kalrez® Perfluorelastomerteile (German)
Kalrez® Perfluorelastomerteile (German)
Brochure
Other
Kalrez® Guide for Safety in Handling Kalrez® Perfluoroelastomer Parts
Kalrez® Guide for Safety in Handling Kalrez® Perfluoroelastomer Parts
Other
Brochure
Perfluoroelastomer and Fluoroelastomer Seals for Photovoltaic Cell Manufacturing Processes
Perfluoroelastomer and Fluoroelastomer Seals for Photovoltaic Cell Manufacturing Processes
Brochure
Brochure
Kalrez® Spectrum™ (Spanish)
Kalrez® Spectrum™ (Spanish)
Brochure
Brochure
Kalrez® Spectrum™ (German)
Kalrez® Spectrum™ (German)
Brochure
Brochure
Kalrez® Spectrum™ (French)
Kalrez® Spectrum™ (French)
Brochure

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Identification & Functionality

Chemical Family
Technologies

Kalrez® 6221 Features & Benefits

Applications & Uses

Properties

Color
Physical Form
Mechanical Properties
ValueUnitsTest Method / Conditions
Modulus (at 100% Elongation)7.2MPaASTM D 412
Tensile Strength15.2MPaASTM D 412
Elongation (at Break)150%ASTM D 412
Hardness (Shore A)70-ASTM D 2240
Compression Set (Pellet Type 1, at 204°C, 70h)27%ASTM D 395B
Compression Set (O-Ring AS568-214, at 204°C, 70h)31%ASTM D 1414
Typical Properties
ValueUnitsTest Method / Conditions
Maximum Service Temperature ¹260°C-
Lowest Service Temperature ¹-20°C-
Thermal Properties
ValueUnitsTest Method / Conditions
Coefficient of Linear Thermal Expansion3.07E-4/°CISO 11359-1/-2
Retraction Temperature (TR-10)-4°CASTM D 1329
Other Properties
ValueUnitsTest Method / Conditions
Density2.18g/cm³ISO 1183
Note
  • [1]: DuPont proprietary test method; useful temperature range may vary with seal design and application specifics
Chemical Resistance

The overall chemical resistance of EPDMs, silicone elastomers and fluoroelastomers (FKM) is limited by their respective polymer structures. Kalrez® parts, on the other hand, offer the same universal chemical resistance as PTFE, but unlike PTFE, they have elastomeric properties, which help them maintain their sealing capa bilities. The following table lists the chemical compatibility of Kalrez® 6221 perfluoroelastomer parts and other elastomers used as sealing materials in the pharmaceutical and food handling industries

Chemical Resistance

Kalrez® 6221

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 Hypochlorite A B B A
Soybean Oil A C A A
Steam (<150°C) A A C C
Steam (>150°C) A C U U
Toluene A U U A
Xylene A U U A
Maximum Service Temperature

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

Technical Details & Test Data

Water Resistance

In aggressive pharmaceutical processing environments, seal failure from excess swelling, embrittlement, or decomposition can cause unscheduled downtime or product contamination. Elastomeric materials that come in contact with highly pure and aggressive water (e.g. WFI) must be chosen with care in order to prolong seal life. The perfluoroelastomer compounds used in Kalrez® parts have been shown to have extremely low, to non-detectable extractable levels in aggressive water systems. Because the perfluoroelastomer polymer in Kalrez® parts is fully saturated, it is also well suited for Ozonated Deionized Water service. Kalrez® parts also exhibit very low swell and loss of mechanical properties after repeated steam cycling.

Kalrez® 6221
DuPont
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