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Typical Properties of Vespel

Property

Test Method
SP-1
SP-21
SP-22

Mechanical Properties

Density (lb/in³) ASTM D792 0.051 0.055 0.060
Tensile Strength, Ultimate @ 73°F (p.s.i.) ASTM D638 12,500 9,500 7,500
Tensile Strength, Ultimate @ 500°F (p.s.i.) ASTM D638 6,000 5,500 3,400
Tensile Elongation, Ultimate 73°F (%) ASTM D638 7.5 4.5 3.0
Tensile Elongation, Ultimate 500°F (%) ASTM D638 6.0 6.0 2.0
Rockwell Hardness ASTM D785 E45-60 E25-45 E5-25
Impact Strength 73°F Notched (ft-lbs/in) ASTM D256 0.8 0.8 -
Flexural Strength Ultimate @ 73°F (p.s.i.) ASTM D790 16,000 16,000 13,000
Flexural Strength Ultimate @ 500°F (p.s.i.) ASTM D790 9,000 9,000 6,500
Flexural Modulus @ 73°F (p.s.i.) ASTM D790 450,000 550,000 700,000
Flexural Modulus @ 500°F (p.s.i.) ASTM D790 250,000 370,000 400,000
Compressive Modulus ASTM D695 350,000 420,000 475,000

Thermal Properties

Heat Deflection at 264psi (°F) ASTM D648 680 680 -
Max Continuous Service Temperature (°F) - 500 500 500
Thermal Conductivity (BTU-in/ft²-hr-°F) ASTM C177 2.0 6.0 12.0
Coefficient of Linear Thermal Expansion (in/in/°F) ASTM D696 0.00003 0.000027 0.000021
Flammability UL94 V-0 V-0 V-0

Electrical Properties

Dielectric Constant At 1 MHz ASTM D150 3.55 13.2 3.5
Dissipation Factor At 1 MHz ASTM D150 0.0034 0.0106 -
Dielectric Strength (V/mil) short time, 1/8" thk. ASTM D149 560 250 -

Water Absorption Rates

Water Absorption -24 hrs. @ 73°F (%) ASTM D570 0.24 0.19 0.14
Water Absorption -48 hrs. @ 122°F (%) ASTM D570 0.72 0.57 0.42

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.
 
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