Better known as TPX® from Mitsui Chemicals. Inc.. Polymethylpentene is a thermoplastic polymer. It is a lightweight. high temperature polyolefin with exceptional acoustical and electrical properties.
TPX® Polymethylpentene (PMP) characteristics are similar to those of traditional polyolefins and include excellent electrical insulating properties and strong hydrolysis resistance. In addition, TPX® features low dielectric, superb clarity, transparency, gas permeability, heat resistance, and release qualities. Chemical resistance and electrical properties of TPX are similar to those of other polyolefins except it retains these properties at higher temperatures than PP or PE.
This Polymethylpentene can be used for extruded and film products, injection molded, and blow molded application items. Because of its high melting point and good temperature stability, polymethylpentene is used for autoclavable medical and laboratory equipment, microwave components, and cookware. It is also often used in electrical components such as LED molds because it is an excellent electrical insulator.
Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.
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At a Glance
Generic Name Polymethylpentene, Copolyme
Available In Sheet, Rod, Tube, Film
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1/4″ – 4″ TH
3/8″ – 4″ DIA
0.002 – 0.029″ TH
Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.
Water Absorption, 24 hrs
Tensile Strength @yield
Tensile Elongation @Break
Hardness, Rockwell R
IZOD Impact Strength Notched
IZOD Impact Strength Un-notched
Coefficient of Linear Thermal Expansion
(x 10⁻⁵ in./in./°F)
Heat Deflection Temp at 66 psi
Heat Deflection Temp at 264 psi
Max Operating Temp
3.1 x 10⁻⁵
Dissipation Factor @ 60 Hz
Volume Resistivity, 50% RH
5 x 105 x 10¹⁶
NOTE: The property values presented above 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.
Medical instrument covers
Sound Equipment-speaker cones
Wire and Cable Applications
FDA compliant grades for use in food processing machinery
Good Chemical Resistance
Low specific gravity
Good Electrical Properties
Good Heat Resistance
Low Moisture Absorption
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