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Polymethylpentene ( TPX )

Material Information

Buy Polymethylpentene on-line

We stock and supply the following standard forms:
Film Granule Monofilament Rod Sheet
Film Granule Monofilament Rod Sheet

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Common Brand Names:
TPX®
 
General Description:  

General Description : A linear isotactic polyolefin more properly called poly 4-methyl pentene-1 which is made by Ziegler-Natta type catalysis (see also General Information under Polyethylene - Low Density). Commercially available grades are copolymers. It is semi-crystalline, transparent and usually colorless (one common grade is slightly yellow), very light and - for a polyolefin - expensive. [Its density of 0.83g.cm 3 is very close to the theoretical minimum for thermoplastics]. Its properties are reasonably similar to those of other polyolefins, compared to which it is more brittle and more gas permeable. It has a higher melting point (240C) than most polyolefins and retains form stability up to temperatures close to this i.e. it softens more slowly with increasing temperature than is normal for thermoplastics. It has good release characteristics and good high frequency electrical and valuable acoustic/ultrasonic properties.

Applications include medical and laboratory apparatus, microwave components and cookware and electronic components.

Grades of TPX® TPX® is available in a range of grades with different melt flow rates (MFR) covering injection molding, extrusion, blow moulding and coating. The list shown below gives details of the main processing methods and the MFR for each grade:

DX845 - MFR of 9 g/10 min - highly recommended for film extrusion, possible use for injection molding, fiber extrusion and blow moulding.

RT31 & RT31XB - MFR of 21 g/10 min - highly recommended for injection molding, possible use for film and fiber extrusion.

MX002 - MFR of 21 g/10 min - highly recommended for injection molding, film and mandrel extrusion, possible use for fiber extrusion and blow moulding.

MX002O - MFR of 21 g/10 min - highly recommended for injection molding and film extrusion, possible use for mandrel and fiber extrusion, and blow moulding.

MX004 & MX004XB - MFR of 25 g/10 min - highly recommended for injection molding, film and mandrel extrusion, possible use for fiber extrusion and blow moulding.

RT18 & RT18XB - MFR of 26 g/10 min - highly recommended for injection moulding, possible use for film and fibre extrusion.

DX231 & DX310 - MFR of 100 g/10 min - highly recommended for paper coating and possible use for fibre extrusion.

DX350 - MFR of 110 g/10 min - highly recommended for paper coating and possible use for fibre extrusion.

DX820 - MFR of 180 g/10 min - highly recommended for paper coating and fibre extrusion.

RT31 & RT31XB: low odor grades RT18XB, RT31XB & MX004XB: blue tint grades

   

Chemical Resistance

Acids - concentrated Good-Fair
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Fair-Poor
Greases and Oils Good-Fair
Halogenated Hydrocarbons Fair-Poor
Halogens Fair-Poor
Ketones Good-Fair

Electrical Properties

Dielectric constant @1MHz 2.12
Dissipation factor @ 1kHz 0.0002
Volume resistivity ( Ohmcm ) >1016

Mechanical Properties

Elongation at break ( % ) 15
Hardness - Rockwell R85
Izod impact strength ( J m-1 ) 49
Tensile modulus ( GPa ) 1.5
Tensile strength ( MPa ) 25.5

Physical Properties

Density ( g cm-3 ) 0.835
Flammability HB
Limiting oxygen index ( % ) 17
Refractive index 1.463
Resistance to Ultra-violet Poor
Water absorption - over 24 hours ( % ) 0.01

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 117
Heat-deflection temperature - 0.45MPa ( C ) 100
Heat-deflection temperature - 1.8MPa ( C ) 40
Lower working temperature ( C ) -20 to -40
Specific heat ( J K-1 kg-1 ) 2000
Thermal conductivity @23C ( W m-1 K-1 ) 0.17
Upper working temperature ( C ) 75-115

Properties for Polymethylpentene Film

Property Value
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 70
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 5
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 20
Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 700

Buy Polymethylpentene on-line

We stock and supply the following standard forms:
Film Granule Monofilament Rod Sheet
Film Granule Monofilament Rod Sheet

Choose a form to search our on-line catalog  

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