TPX™ (Polymethylpentene)

TPX™ has a high melting point in the range from 220 ℃ to 240 ℃ and a high vicat softening temperature. Hence, it can be used for high temperature application. However, as heat distortion temperature of TPX™ is almost same as that of polypropylene, the application under highstress environment needs to be carefully considered.

The surface tension of TPX™ (24mN/m) is very low and this value is the secondary lowest as compared to fluorine polymers. Hereby, TPX™ shows excellent releasability against various materials. TPX™ is used as release material in hardening process of thermosetting resins (urethane, epoxy etc.) Furthermore, since TPX™ shows incompatibility against thermoplastic resins (PET, PP etc.) it is used to create a porous structure in PET or PP membranes.

Although TPX™ is a crystalline polymer, it exhibits excellent transparency (Haze : < 5 % ) and light transmittance. Especially TPX™ is used for optical analysis cells because of the higher UV transmittance as compared to glass and other transparent polymers.

Because of its stable C-C bonds, TPX™ has better chemical resistance as compared to polycarbonate and acrylic polymer. TPX™ basically shows excellent chemical resistance particularly against acids, alkalis and alcohol.
For this reason, TPX™ is used in various applications which require chemical resistance, such as cosmetic container caps and tubes, experimental apparatus and analytical cells.

TPX™ has a characteristic of excellent gas permeability derived from its molecular structure.
Hence, TPX™ is widely used for gas permeative applications such as gas separation membranes.

Since TPX™ has a non-polar structure; its dielectric property is almost same as fluorine polymers. It should be noted that dielectric property of TPX™ is hardly affected by frequency and TPX™ can be injection-molded unlike PTFE. TPX™ shows stable dielectric property in the wide range of frequency.

The density of TPX™ is the lowest (830 kg/m³) among thermoplastic polymers, and its specific volume is larger than that of other transparent polymers. For this reason, it is possible to reduce the weight of injection-molded articles by using TPX™ or also TPX™ compounds.

TPX™ shows a very low water absorbance and therefore the dimension of a TPX product is hardly affected by water absorbance. Furthermore, since TPX™ does not hydrolyze in boiling water, it can be used for experimental apparatus and animal cages which require the steam sterilization.

Hygienic approved TPX™ grades (JPN standards, FDA regulations and EU regulations) are also available and they are used for food wraps and microwave oven tableware.

The refractive index of TPX™ is 1.463nD20, lower than fluorine polymers.