Vespel® SP-21 is enhanced with 15% graphite by weight which is added to the base resin for increased resistance and reduced friction in applications such as bearings, thrust washers, bushings, seal rings, slide blocks, and other wear applications.
Vespel® SP-21 has the highest mechanical properties of the graphite filled grades. Automotive engineers love to use Vespel® SP-21 for parts like thrust washers, bearings, and seals because the low-friction properties means they work with or without lubrication.
mco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.
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| Type | Size | Length | Color |
|---|---|---|---|
| Sheet | 0.062″ – 2.0″ | 10″ x 10″ | Black |
| Rod | 1/4″ – 6″ DIA | CTS | Black |
Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.
| Physical Properties | Units | ASTM | Results |
|---|---|---|---|
| Density | lb/in3 | D792 | 0.055 |
| Water Absorption. 24 hrs | % | D570 | .19 |
| Mechanical Properties | Units | ASTM | Results |
|---|---|---|---|
| Tensile Strength @yield | psi | D638 | 9,500 |
| Tensile Modulus | psi | D638 | |
| Tensile Elongation @Break | % | D638 | 4.5 |
| Flexural Strength | psi | D790 | 16,000 |
| Flexural Modulus | psi | D790 | 550,000 |
| Hardness. Rockwell R | D785 | E25-45 | |
| IZOD Impact Strength Notched | ft-lb/in | D256 | 0.8 |
| Thermal Properties | Units | ASTM | Results |
|---|---|---|---|
| Coefficient of Linear Thermal Expansion | (x 10-5 in./in./°F) | D256 | 2.7 |
| Max Continuous Operating Temperature | °F | 500 | |
| Heat Deflection Temp at 264 psi | °F | 680 |
NOTE: The property values presented above are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.
NOTE: Several grades of this material are available. For additional information regarding this plastic, contact your Emco Industrial Plastics representative or call 973-459-4321.
