Kalrez® 4079 perfluoroelastomer parts are a low compression set product for general purpose use in O-rings, diaphragms, seals and other parts used in the chemical process and aircraft industries. It is a carbon black filled product with excellent chemical resistance, good mechanical properties, and outstanding hot air aging properties. It exhibits low swell in organic acids, inorganic acids and aldehydes, and has good response to temperature cycling effects. A maximum service temperature of 316°C (600°F) is suggested, with short excursions to higher temperatures possible. Kalrez® 4079 is not recommended for use in hot water/steam applications or in contact with certain hot aliphatic amines, ethylene oxide, or propylene oxide.
Polymer Name: Perfluoroelastomer (FFKM)
Physical Form: Seals, Custom, Diaphragms, O-rings
Features: Good Mechanical Properties, High Temperature Resistance, Heat Aging Resistant, Low Compression Set, Good Thermal Stability, Chemical Resistant, General Purpose
End Uses: Semiconductor Applications, Pump Parts, Aircraft Applications
Color: Black
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Identification & Functionality
Chemical Family
Fillers Included
Polymer Name
Technologies
Product Families
Kalrez® 4079 Features & Benefits
Product Highlights
- Good response to temperature cycling effects
- Outstanding hot air aging properties
- It exhibits low swell in organic and inorganic acids
Performance Characteristics
Figure 1 : Compression set at 204°C
Figure 2 : Sealing force retention at 204°C
Figure 3 : Performance Comparison
Applications & Uses
Applications
Plastics & Elastomers End Uses
Properties
Color
Physical Form
Mechanical Properties
| Value | Units | Test Method / Conditions | |
| Modulus (at 100% Elongation) | 7.2 | MPa | ASTM D 412 |
| Tensile Strength | 16.9 | MPa | ASTM D 412 |
| Elongation (at Break) | 150 | % | ASTM D 412 |
| Hardness (Shore A) | 75 | - | ASTM D 2240 |
| Compression Set (Pellet Type 1, at 204°C, 70h) | 14 | % | ASTM D 395B |
| Compression Set (O-Ring AS568-214, at 204°C, 70h) | 35 | % | ASTM D 1414 |
Typical Properties
| Value | Units | Test Method / Conditions | |
| Maximum Service Temperature ¹ | 316 | °C | - |
| Lowest Service Temperature ¹ | -19 | °C | - |
Thermal Properties
| Value | Units | Test Method / Conditions | |
| Glass Transition Temperature (at 10°C/min) | -6.7 | °C | ASTM D 3418 |
| Coefficient of Linear Thermal Expansion | 3.61 | E-4/°C | ISO 11359-1/-2 |
| Retraction Temperature (TR-10) | -2 | °C | ASTM D 1329 |
Other Properties
| Value | Units | Test Method / Conditions | |
| Density | 2.02 | g/cm³ | ISO 1183 |
Note
- [1]: DuPont proprietary test method; useful temperature range may vary with seal design and application specifics
Kalrez® 4079
DuPont