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Kalrez® 6230

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: Black
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Identification & Functionality

Chemical Family

Kalrez® 6230 Features & Benefits

Applications & Uses


Physical Form
Mechanical Properties
ValueUnitsTest Method / Conditions
Modulus (at 100% Elongation)9.6MPaASTM D 412
Tensile Strength16.5MPaASTM D 412
Elongation (at Break)170%ASTM D 412
Hardness (Shore A)75-ASTM D 2240
Compression Set (Pellet Type 1, at 204°C, 70h)25%ASTM D 395B
Compression Set (O-Ring AS568-214, at 204°C, 70h)26%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 Expansion2.89E-4/°CISO 11359-1/-2
Retraction Temperature (TR-10)-3°CASTM D 1329
Other Properties
ValueUnitsTest Method / Conditions
Density1.99g/cm³ISO 1183
  • [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 elastom ers and fluoroelastomers (FKM) is limited by their respective polymer structures. Kalrez® parts, on the other hand, offer the same universal chemical resist ance as PTFE, but unlike PTFE, they have elastomeric properties, which help them maintain their sealing capabilities. The following table lists the chemical compatibility of Kalrez® perfluoroelastomer parts and other elastomers used as sealing materials in the pharmaceutical and food handling industries

Chemical Resistance

Kalrez® 6221

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
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

Aggressive 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® 6230