It is used for gas-permeable packaging, autoclavable medical and laboratory equipment, microwave components, and cookware.

[1] Polymethylpentene is a 4-methyl-1-pentene-derived linear isotactic polyolefin and is made by Ziegler–Natta type catalysis.

It has low moisture absorption, and exceptional acoustical and electrical properties.

[citation needed] Its properties are reasonably similar to those of other polyolefins, although it is more brittle and more gas permeable.

[2] In comparison to other materials being used for operating in THz range, TPX shows excellent optical properties with a wavelength independent refractive index of 1.460±0.005 between visible light and 100~GHz.