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Grade: RT18
Formula: PMP TPX®
Form: Disk
Material: Polymethylpentene (PMP, TPX®)
Commodity: Polymers
Production Method:
Compression Moulded
Color:
Natural
TPX RT18 PMP Disk is a precision-machined form of polymethylpentene, grade RT18, a transparent polyolefin renowned for its high clarity, low density, and excellent chemical resistance. As a disk, it is valued for applications requiring lightweight, durable, and optically stable components. Industries such as medical technology, analytical instrumentation, and optics employ RT18 PMP disks for their high light transmittance in the near-infrared region and resistance to moisture and chemicals. Specific applications include optical windows in diagnostic devices, substrates for microfluidic platforms, and lightweight transparent shielding in analytical instruments. In research, RT18 PMP disks are investigated for their dielectric properties, optical performance across broad wavelengths, and integration into lightweight composites. Their unique combination of optical clarity, chemical resistance, and low density makes them critical in advanced optical, biomedical, and research-driven applications.
Tolerances
Disc
| Thickness | ±20% |
|---|
Material Properties for Polymers
Chemical Resistance
| Element | Value |
|---|---|
| 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
| Element | Value |
|---|---|
| Dielectric constant @1MHz | 2.12 |
| Dissipation factor @ 1kHz | 0.0002 |
| Volume resistivity( Ohmcm ) | >10¹⁶ |
Physical Properties
| Element | Value |
|---|---|
| Flammability | HB |
| Refractive index | 1.463 |
| Resistance to Ultra-violet | Poor |
| Limiting oxygen index( % ) | 17 |
| Water absorption - over 24 hours( % ) | 0.01 |
| Density( gcm⁻³ ) | 0.835 |
Mechanical Properties
| Element | Value |
|---|---|
| Hardness - Rockwell | R85 |
| Elongation at break( % ) | 15 |
| Tensile modulus( GPa ) | 1.5 |
| Izod impact strength( J m⁻¹ ) | 49 |
| Tensile strength( MPa ) | 25.5 |
Thermal Properties
| Element | Value |
|---|---|
| Heat-deflection temperature - 0.45MPa( C ) | 100 |
| Heat-deflection temperature - 1.8MPa( C ) | 40 |
| Lower working temperature( C ) | 20 |
| Upper working temperature( C ) | 75-115 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 2000 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 0.17@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 117 |
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RT18 PMP Rod Grade: RT18
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RT31 PMP Granules Grade: RT31
Formula: TPX®
Nominal Granule Size: 3mm
Weight: 10000g
Type: Injection Moulding
UOM Code: 138-969-98
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