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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Polymethylpentene, Copolyme
Available In
Sheet, Rod, Tube, Film
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| Type | Size | Length | Color |
|---|---|---|---|
| Sheet | 1/4″ – 4″ TH | Natural | |
| Rod | 3/8″ – 4″ DIA | Natural | |
| Tube | CUSTOM | Natural | |
| Film | 0.002 – 0.029″ TH | Natural |
Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.
| Physical Properties | Units | ASTM | Results |
|---|---|---|---|
| Density | lb/in³ | D792 | 0.045 |
| Water Absorption, 24 hrs | % | D570 | 0.3 |
| Mechanical Properties | Units | ASTM | Results |
|---|---|---|---|
| Tensile Strength @yield | psi | D638 | 10200 |
| Tensile Modulus | psi | D638 | 360000 |
| Tensile Elongation @Break | % | D638 | 30 |
| Flexural Strength | psi | D790 | 15000 |
| Flexural Modulus | psi | D790 | 400000 |
| Compressive Strength | psi | D695 | 13000 |
| Compressive Modulus | psi | D695 | 375000 |
| Hardness, Rockwell R | D785 | M82/R128 | |
| IZOD Impact Strength Notched | ft-lb/in | D256 | 1.3 |
| IZOD Impact Strength Un-notched | ft-lb/in | D256 | NO BREAK |
| Thermal Properties | Units | ASTM | Results |
|---|---|---|---|
| Coefficient of Linear Thermal Expansion | (x 10⁻⁵ in./in./°F) | D256 | 3.1 |
| Heat Deflection Temp at 66 psi | °F | D648 | 358 |
| Heat Deflection Temp at 264 psi | °F | 340 | |
| Melting Temperature | °F | D3418 | 374 |
| Max Operating Temp | °F | 300 | |
| Thermal Conductivity | BTU-in/ft²-hr-°F | C177 | 3.1 x 10⁻⁵ |
| Flammability Rating | UL94 | HB |
| Electrical Properties | Units | ASTM | Results |
|---|---|---|---|
| Dielectric Strength | V/mil | D149 | 425 |
| Dielectric Constant | 1MHz | D150 | 3.14 |
| Dissipation Factor @ 60 Hz | 1MHz | D150 | 0.0008 |
| Volume Resistivity, 50% RH | ohm-cm | D257 | 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.