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Polymethylpentene (PMP) is a transparent thermoplastic polymer and high-molecular weight hydrocarbon. It is classified as a polyolefin, and is comparable to Polypropylene (PP), except for that fact that it is slightly more susceptible to attack by oxidizing agents.

The material has a very low density (0.84 g/cm3), low moisture absorption, and exceptional acoustical and electrical properties. Like all polyolefins, PMP is non-toxic, non-contaminating, and lighter than water; although it is more brittle and gas permeable than other materials in the polyolefin family. PMP also has high thermal stability, excellent dielectric characteristics and a high chemical resistance. It is one of the lightest materials among thermoplastic polymers suited for commercial use, and can be used for a wide range of purposes.

One of the trademarks of the material–TPX™ from Mitsui Chemicals– exhibits transparency equivalent to glass or acrylic. This, along-with a high melting point and extremely low water absorption rate, makes TPX™ an excellent choice for items that require steam sterilization

Its transparency, rigidity and resistance to chemicals and high temperatures make PMP a superior material for lab ware, and medical and laboratory equipment for autoclaves.

PMP is also employed heavily in gas permeable packaging–as films and coatings–and in microwave components, and cookware.


  • Gas permeable packaging
  • Lab-ware and autoclave-suitable equipment
  • LED molds
  • Food processing machinery

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