ISO 9001:2015 Certified | Cage Code: 7L0f6
TYPICAL PROPERTIES of VESPEL® SP-21 |
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| ASTM or UL test | Property | Vespel® SP-21 |
| – | Filler Material | 15% Graphite |
| PHYSICAL | ||
| D792 | Density (lb/in³) (g/cm³) |
0.055 1.51 |
| D570 | Water Absorption, 24 hrs @ 73°F (%) 48 hrs @ 122°F (%) |
0.19 0.57 |
| MECHANICAL | ||
| D638 | Tensile Strength, Ultimate @ 73°F (psi) @ 500°F (psi) |
9,500 5,500 |
| D638 | Tensile Modulus (psi) | – |
| D638 | Tensile Elongation, Ultimate @ 73°F (%) @ 500°F (%) |
4.5 6.0 |
| D790 | Flexural Strength, Ultimate @ 73°F (psi) @ 500°F (psi) |
16,000 9,000 |
| D790 | Flexural Modulus @ 73°F (psi) @ 500°F (psi) |
550,000 370,000 |
| D695 | Compressive Strength, 10% strain @ 73°F (psi) | 19,300 |
| D695 | Compressive Modulus (psi) | 420,000 |
| D785 | Hardness, Rockwell | E25-45 |
| D256 | IZOD Notched Impact (ft-lb/in) | 0.8 |
| Poisson’s Ratio | 0.4 | |
| THERMAL | ||
| D696 | Coefficient of Linear Thermal Expansion (x 10-5 in./in./°F) |
2.7 |
| D648 | Heat Deflection Temp (°F / °C) at 264 psi |
680 / 360 |
| – | Max Continuous Operating Temp (°F / °C) | 500 / 260 |
| C177 | Thermal Conductivity (BTU-in/ft²-hr-°F) (x 10-4 cal/cm-sec-°C) |
6.0 20.7 |
| UL94 | Flammability Rating | V-0 |
| ELECTRICAL | ||
| D149 | Dielectric Strength (V/mil) short time, 1/8″ thick | 250 |
| D150 | Dielectric Constant at 1 MHz | 13.2 |
| D150 | Dissipation Factor at 1 MHz | 0.0106 |
| D257 | Volume Resistivity (ohm-cm)at 50% RH | 1012 – 1013 |