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TPX® Polymethylpentene Specifications 

 

GENERAL DESCRIPTION
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.

 

APPLICATIONS

 


TYPICAL PROPERTIES of TPX ® PolyMethylPentene

ASTM or UL test Property TPX
PHYSICAL
D792 Density (lb/in³)
(g/cm³)
0.030
0.83
D570 Water Absorption, 24 hrs (%) 0.01
MECHANICAL
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
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in.- °F)
6.5
D648 Heat Deflection Temp (°F / °C)
at 264 psi

212 / 100
D3418 Melting Temp (°F / °C) 464 / 240
- Max Operating Temp (°F / °C) - / -
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)

1.16
4.0
UL94 Flammability Rating HB
ELECTRICAL
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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