Kalrez® Spectrum™ 7275 parts are a light brown product based on a proprietary crosslinking system targeted specifically for the chemical processing industry. It exhibits minimal swelling and improved retention of physical properties when exposed to aggressive chemicals, e.g., concentrated nitric acid, organosilanes, chlorosiloxanes, pure ethylene oxide, butyraldehyde, amines and vinyl and acrylic monomers. It also has excellent compression set resistance and good retention of physical properties after aging at high temperatures. A maximum service temperature of 300°C is suggested.
Polymer Name: Perfluoroelastomer (FFKM)
Physical Form: Seals
Features: Good Compressive Strength, Good Mechanical Properties, Good Retention of Properties
End Uses: Semiconductor Applications, Pump Parts
Color: Brown
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TypeDocument Name
Brochure
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Identification & Functionality
Chemical Family
Polymer Name
Technologies
Product Families
Kalrez® Spectrum™ 7275 Features & Benefits
Performance Characteristics
Applications & Uses
Applications
Plastics & Elastomers End Uses
Properties
Mechanical Properties
| Value | Units | Test Method / Conditions | |
| Modulus (at 100% Elongation) | 9.7 | MPa | ASTM D 412 |
| Tensile Strength | 14.5 | MPa | ASTM D 412 |
| Elongation (at Break) | 160 | % | ASTM D 412 |
| Hardness (Shore A) | 75 | - | ASTM D 2240 |
| Compression Set (O-Ring AS568-214, at 204°C, 70h) | 22 | % | ASTM D 1414 |
Typical Properties
| Value | Units | Test Method / Conditions | |
| Maximum Service Temperature ¹ | 300 | °C | - |
Thermal Properties
| Value | Units | Test Method / Conditions | |
| Glass Transition Temperature (at 10°C/min) | -5.3 | °C | ASTM D 3418 |
| Coefficient of Linear Thermal Expansion | 4.21 | E-4/°C | ISO 11359-1/-2 |
Other Properties
| Value | Units | Test Method / Conditions | |
| Density | 2.08 | g/cm³ | ISO 1183 |
Note
- [1]: DuPont proprietary test method; useful temperature range may vary with seal design and application specifics
Chemical Resistance
Weight % Change6 Comparison Between Different FFKMs After Chemical Immersion. Low levels of weight gain/volume swell typically have good correlation with elastomer compatibility and seal functionality.
| Chemical | Temperature°C (°F) |
Immersion Time (hrs.) |
Kalrez® Spectrum™ 7275 |
FFKM 1 | FFKM 2 |
|---|---|---|---|---|---|
| Ethylene Oxide (100%) | 31 (88) | 1344 | 0.6 | 1.5 | 1.0 |
| Ethylene Oxide (100%) | 50 (122) | 672 | 2.2 | 3.2 | 5.6 |
| Ethylene Oxide (100%) | 93 (200) | 672 | 1.8 | 8.7 | 18.3 |
| Acrylic Acid (100%) | 100 (212) | 672 | 1.4 | 2.5 | N/A |
| Styrene (100%) | 67 (153) | 1600 | 1.4 | >20% | >20% |
| Acetic Acid (100%) | 100 (212) | 672 | 1.9 | 2.7 | 5.2 |
| Ethylenediamine (98 %) | 90 (194) | 672 | 3.1 | 3.5 | 9.6 |
| Nitric Acid (70%) | 85 (185) | 672 | 1.5 | 4.7 | 10.6 |
| Butyraldehyde (100%) | 70 (158) | 672 | 1.7 | 2.5 | 2.9 |
| Sulfuric Acid (98%) | 150 (302) | 672 | 1.4 | 8.9 | 7.7 |
| Toluene (100%) | 100 (212) | 672 | 2.4 | 2.7 | N/A |
| Syltherm™ 800 | 270 (518) | 168 | 0.6 | N/A | N/A |
| Chlorosilanes (Mixture) | 70 (158) | 768 | 2.3 | 8.9 | 7.5 |
Kalrez® Spectrum™ 7275
DuPont