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Vespel® Polyimide Specifications

904 West 6th Street, Shiner, Texas 77984 USA
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail: info@boedeker.com

1-800-444-3485

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BPI Vespel Product Feature | Vespel Polyimide

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GENERAL PROPERTIES

click to resize photo Vespel® is a high performance polyimide material which is formed from resin manufactured only by DuPont. Polyimide materials are characterized by a ring-shaped molecular structure containing Nitrogen.

Vespel® is one of the highest performing engineering plastics currently available. Vespel® will not melt and can operate continuously from cryogenic temperatures to 550°F (288°C), with excursions to 900°F (482°C). Vespel® parts consistently exhibit superior performance in a variety of applications requiring low wear and long life in severe environments.

VESPEL® FEATURES

• Excellent temperature resistance • High wear resistance (especially SP-21) • Dimensionally stable • Resistant to radiation • Extremely low outgassing • Relatively easy to machine

VESPEL® APPLICATIONS

• Rotary seal rings • Thrust washers and discs • Bushings • Flanged bearings • Plungers • Printer wire guides • Spline couplings • Wear strips • Valve seats • Thermal and electrical insulators • Wafer clamping, polishing and grinding rings • Wafer guides & carriers • Vacuum pads • Die pickup collets
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VESPEL ® GRADES

Vespel ® SP-1 (see also Duratron D7000 PI and Plavis N)
Vespel ® SP-1 is the unfilled base resin grade. SP-1 provides maximum physical strength, elongation, and toughness as well as the best electrical and thermal insulation values. Typical applications include spacers, high-temp fixtures, valve seats, balls, gaskets, insulators, and seals.

Vespel ® SP-21 (see also Duratron D7015G PI and Plavis G15)
Vespel ® SP-21 has 15% graphite by weight added to the base resin for increased wear resistance and reduced friction in applications such as bearings, thrust washers, bushings, seal rings, slide blocks and other wear applications. SP-21 has the highest mechanical properties of the graphite filled grades.

Vespel ® SP-22 (see also Plavis G40)
Vespel ® SP-22 has 40% graphite by weight for enhanced wear resistance, lower friction, improved dimensional stability (low coefficient of thermal expansion), and stability against oxidation. Typical uses are the same as those for SP-21.

Vespel ® SP-211
Vespel ® SP-211 has 10% PTFE and 15% graphite by weight added to the base resin for the lowest coefficient of friction over a wide range of operating conditions. It also has excellent wear resistance up to 300°F (149°C). Typical applications include sliding or linear bearings as well as many wear and friction uses listed above.

Vespel ® SP-3 (see also Plavis MS)
Vespel ® SP-3 is 15% moly-filled (molybdenum disulfide solid lubricant) for wear and friction resistance in vacuum and other moisture-free environments where graphite actually becomes abrasive. Typical applications include seals, bushings, bearings, gears, and other wear surfaces in outer space, ultra-high vacuum or dry gas applications.

see also datasheets for:
Duratron PI Polyimide | Other Duratron Products | Plavis Polyimide

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TYPICAL PROPERTIES of VESPEL®

ASTM or UL test Property SP-1 SP-21 SP-22 SP-211 SP-3
- Filler Material Unfilled 15% Graphite 40% Graphite 10% PTFE,
15% Graphite
15% Moly
PHYSICAL
D792 Density (lb/in³)
(g/cm³)
0.051
1.43
0.055
1.51
0.060
1.65
0.056
1.55
0.058
1.60
D570 Water Absorption, 24 hrs @ 73°F (%)
48 hrs @ 122°F (%)
0.24
0.72
0.19
0.57
0.14
0.42
0.21
0.49
0.23
0.65
MECHANICAL
D638 Tensile Strength, Ultimate @ 73°F (psi)
@ 500°F (psi)
12,500
6,000
9,500
5,500
7,500
3,400
6,500
3,500
8,200
-
D638 Tensile Modulus (psi) - - - - -
D638 Tensile Elongation, Ultimate @ 73°F (%)
@ 500°F (%)
7.5
6.0
4.5
6.0
3.0
2.0
3.5
3.0
4.0
-
D790 Flexural Strength, Ultimate @ 73°F (psi)
@ 500°F (psi)
16,000
9,000
16,000
9,000
13,000
6,500
10,000
5,000
11,000
5,500
D790 Flexural Modulus @ 73°F (psi)
@ 500°F (psi)
450,000
250,000
550,000
370,000
700,000
400,000
450,000
200,000
475,000
270,000
D695 Compressive Strength, 10% strain @ 73°F (psi) 19,300 19,300 16,300 14,800 18,500
D695 Compressive Modulus (psi) 350,000 420,000 475,000 300,000 350,000
D785 Hardness, Rockwell E45-60 E25-45 E5-25 E1-20 E40-55
D256 IZOD Notched Impact (ft-lb/in) 0.8 0.8 - - 0.4
Poisson's Ratio 0.4 0.4 - - -
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
3.0 2.7 2.1 3.0 2.9
D648 Heat Deflection Temp (°F / °C)
at 264 psi

680 / 360

680 / 360
- - -
- Max Continuous Operating Temp (°F / °C) 500 / 260 500 / 260 500 / 260 500 / 260 500 / 260
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)

2.0
6.9

6.0
20.7

12.0
41.3

5.3
18.3

3.2
11.0
UL94 Flammability Rating V-0 V-0 V-0 V-0 V-0
ELECTRICAL
D149 Dielectric Strength (V/mil) short time, 1/8" thick 560 250 - - -
D150 Dielectric Constant at 1 MHz 3.55 13.2 - - -
D150 Dissipation Factor at 1 MHz 0.0034 0.0106 - - -
D257 Volume Resistivity (ohm-cm)at 50% RH 1014 - 1015 1012 - 1013 - - -

NOTE: The information contained herein 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.
Product Feature BPI Vespel Product Feature | DuPont Vespel Literature


DURATRON is a registered trademark of Quadrant Engineering Plastic Products.
PLAVIS is a registered trademark of Daelim H&L (Korea).
VESPEL is a registered trademark of DuPont.

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Boedeker Plastics, Inc.
904 West 6th Street, Shiner, Texas 77984 USA
USA TOLLFREE : 1-800-444-3485
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail: info@boedeker.com

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