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Typical Properties of PET, PBT, & PEEK

Property

Test Method PET PBT PEEK

Mechanical Properties

Specific Gravity ASTM D792 1.38 1.31 1.32
Density (lb/in³) ASTM D792 0.0499 - 0.0477
Tensile Strength, Break (p.s.i.) ASTM D638 11,500 7,500 14,000
Elongation At Break (%) ASTM D638 70 200 60
Tensile Modulus (p.s.i.) ASTM D638 400,000 377,000 490,000
Rockwell Hardness ASTM D785 R117 M72 R126 / M99
Impact Strength 73°F Notched (ft-lbs/in) ASTM D256 0.7 1.0 1.6
Flexural Strength (p.s.i.) ASTM D790 15,000 12,000 24,600
Flexural Modulus (p.s.i.) ASTM D790 400,000 330,000 590,000
Coefficient Of Friction (Dynamic) 40psi 50fpm 0.25 0.22 0.25

Thermal Properties

Melting Point (°F) - 490 428 644
Heat Deflection at 66psi (°F) ASTM D648 240 310 -
Heat Deflection at 264psi (°F) ASTM D648 175 130 306
Max Service Temperature Short Term (°F) - 320 250 600
Max Service Temperature Long Term (°F) - 230 245 480
Thermal Conductivity (BTU-in/ft²-hr-°F) ASTM C177 2.01 - 1.73
Coefficient of Linear Thermal Expansion (in/in/°F) ASTM D696 0.000039 0.000078 0.000026
Flammability UL94 HB HB V-0

Electrical Properties

Dielectric Constant At 60HZ ASTM D150 3.4 3.3 3.2
Dissipation Factor At 60HZ ASTM D150 0.002 0.0009 0.003
Dielectric Strength (V/mil) ASTM D149 400 400 480

Water Absorption Rates

Water Absorption -24 hrs.(%) ASTM D570 0.10 0.08 0.5
Water Absorption -Saturation (%) ASTM D570 0.50 0.50 0.50

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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