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TPX ® Polymethylpentene is the lightest of all known polymers with a density of 0.83 g/cm³. It's most important property is optical transparency in both the far-infrared and visible parts of the spectrum. TPX ® also has excellent electrical insulating and chemical resistance properties, and offers a very high melting point. It is available in sheet, rod, tube and film forms.
OPTICAL AND ACOUSTIC PROPERTIES
TPX ® is optically transparent in far-infrared and visible parts of the spectrum, allowing the co-transmission of a HeNe laser alignment beam. Index of refraction is 1.46 and is relatively independent of wavelength. Loss is very low at mm-wavelengths and gradually increases until becoming unacceptable in the mid-IR at about 30 to 50 microns wavelength.
Because of its low density, TPX ® has high acoustic efficiency (a high damping factor due to large internal losses.) It also displays exceptionally low distortion and high power handling characteristics.
Sound equipment -- speaker cones, ultrasound scanners
Medical -- instrument handles, petri dishes
Microwave oven trays
TYPICAL PROPERTIES of TPX ® PolyMethylPentene
|ASTM or UL test||Property||TPX|
|D570||Water Absorption, 24 hrs (%)||0.01|
|D638||Tensile Strength (psi)||4,100|
|D638||Tensile Modulus (psi)||280,000|
|D638||Tensile Elongation at Break (%)||10|
|D790||Flexural Strength (psi)||6,100|
|D790||Flexural Modulus (psi)||210,000|
|D695||Compressive Strength (psi)||-|
|D695||Compressive Modulus (psi)||-|
|D785||Hardness, Shore D||D85|
|D256||IZOD Notched Impact (ft-lb/in)||1|
|D696||Coefficient of Linear Thermal Expansion
(x 10-5 in./in.- °F)
|D648||Heat Deflection Temp (°F / °C)
at 264 psi
212 / 100
|D3418||Melting Temp (°F / °C)||464 / 240|
|-||Max Operating Temp (°F / °C)||- / -|
(x 10-4 cal/cm-sec-°C)
|D149||Dielectric Strength (V/mil) short time, 1/8" thick||20|
|D150||Dielectric Constant at 1 KHz||2.12|
|D150||Dissipation Factor at 1 MHz||0.000025|
|D257||Volume Resistivity (ohm-cm)at 50% RH||> 1016|
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.
TPX is a registered trademark of Mitsui Petrochemical Industries, Ltd.
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