Polymethylpentene
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| Identifiers | |
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25068-26-2 
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| PubChem | 24867561 |
| Properties | |
| (C6H12)n | |
| Molar mass | variable |
| Density | 0.833 g/mL |
| Melting point | 240 °C (464 °F; 513 K) |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Polymethylpentene (PMP), also known as Poly(4-methyl-1-pentene), is a thermoplastic polymer of 4-methyl-1-pentene. It is used for gas permeable packaging, medical and laboratory equipment, microwave components, and cookware. It is commonly called TPX, which is a trademark of Mitsui Chemicals.
Polymethylpentene is a 4-methyl-1-pentene based linear isotactic polyolefin and is made by Ziegler-Natta type catalysis. The commercially available grades are usually copolymers. It can be extruded and molded (by injection molding or blow molding).
Polymethylpentene melts at ≈ 235 °C. It has a very low density (0.84 g/cm3) and is transparent. It has low moisture absorption, and exceptional acoustical and electrical properties. Its properties are reasonably similar to those of other polyolefins, although it is more brittle and more gas permeable. The polymer also has a high thermal stability, excellent dielectric characteristics and a high chemical resistance. The crystalline phase has a lower density than the amorphous phase.
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