TPX™ (methylpentenecopolymer)

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TPX is a specially designed crystalline polyolefin with outstanding heat resistance, reliability and transparency.

TPX has excellent transparency, heat resistance and peelability. It is widely used in various fields ranging from industrial materials such as release film, release paper, mandrel for high pressure rubber hose and LED mold, to the food wrapping area such as heat-resistant wrapping films, freshness-keeping containers for fruits and vegetables, as well as the usual usage such as physicochemistry experimental instruments and food containers of microwave oven.

Heat resistance

Having a high melting point (depending on the selected grade within a range of 220℃ to 240℃ ) TPX can be used at high temperatures.
At the same time it serves with a rather high Vicat softening point.
However, in case of applications where load is applied to TPX,special attention has to be paid to its heat distortion temperature,which is almost the same as that of polypropylene.

Peel ability / Non-compatibility

Since TPX has a very low surface tension of only 24mN/m, what is even lower than that of some fluorocarbons, TPX shows an excellent peel ability from a big variety of materials. Because of this characteristic, TPX is used where an excellent separating property is required; for example as a release material at the time of curing thermosetting resins (such as urethane and epoxy). Furthermore, since TPX does not mix with other thermoplastic resins (such as PET and PP), it is used for the purpose of making PET- and PP-films micro-porous.

Separating force from Epoxy

Low refractive index

The refractive index of TPX is only 1.463 nD20 , what is lower than that of fluorocarbon or other transparent resins.
So in case low-refraction material is required, TPX is one of the best choices.

Gas permeability

TPX has a very high gas permeability (10 times higher than that of PE), what makes it an excellent material for gas- separating applications like permeable films, membranes and hollow-fibres.

Chemical resistance

Like polyolefines TPX shows an excellent chemical resistance which is better than that of e.g. polycarbonate or acrylics. That’s why TPX for example is so often used in the cosmetic field for caps and tubes.

Steam resistance

The water absorption of TPX is very low and therefore dimensional change caused by hydrolysis cannot be observed. Even in boiling water TPX does not hydrolyze.
Therefore TPX is the predestined material for such applications which require steam sterilization.

Low-dielectric properties

Because of its outstanding dielectrical properties - ε = 2.1 and tan δ = 0.0008 (at 12 GHz) - TPX fits very well in the field of high-frequency applications.

Food sanitation properties

TPX is available in a wide range of grades to meet requirements and regulations of various*, US FDA-standards and EU-foodstandards.

Japanese standards tests.

Low density

TPX provides the lowest density (830kg/m3)among all thermoplastic resins; i.e. it offers the largest specific volume, what makes it possible to reduce moulded-part weight by substituting other resin with TPX.


Although TPX is a crystalline resin,it is transparent like glass and has an excellent transmission rate for visible light (> 93% ; haze < 5% ). On top of this it shows a better transmission in the UV-range compared with glass or other transparent resins. That is why TPXis for example used for spectroscopic analysis cells.