Home » TPX® Polymethylpentene (PMP) Characteristics
TPX® Polymethylpentene (PMP) Characteristics

Heat Resistance
Having a high melting point (depending on the selected grade within a range of 220°C to 240°C) 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.

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Peelability / 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 peelability 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

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Transparency
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 TPX® is, for example, used for spectroscopic analysis cells.

 

Low Refractive Index
The refractive index of TPX® is only 1.463 n20D, which is lower than that of fluorocarbon or other transparent resins. So in the case where low-refraction material is required, TPX® is one of the best choices.

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

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

 

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.

 

Chemical Resistance
Like polyolefins, TPX® shows an excellent chemical resistance which is better than that of polycarbonate or acrylics. That is why TPX®, for example, is so often used in the cosmetic field for caps and tubes.

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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 domestic markets, US FDA-standards and EU-food-standards.

 

As for the EC Directive, it is necessary to check the conformity of the application at the level of the end product. TPX® contains chemical substances whose Specific Migration Limit (SML) is 0.05 mg/kg and 5 mg. For the details of the conformity of TPX® with the FDA regulations, please contact our responsible department.

 

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