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Grade: RT18
Formula: PMP TPX®
Form: Rod
Material: Polymethylpentene (PMP, TPX®)
Commodity: Polymers
RT18 PMP Rod is a solid form of polymethylpentene, grade RT18, offering excellent transparency, low density, and superior chemical resistance compared to many engineering plastics. Its rigidity and ease of machining make it suitable for precision components where optical stability and chemical resilience are required. Industries such as medical instrumentation, optics, and chemical processing employ RT18 PMP rods for lightweight, transparent structural components. Specific uses include precision optical holders, chemically resistant laboratory fittings, and dielectric parts in electronic systems. In research, RT18 PMP rods are studied for their crystallinity, optical transmission, and dielectric performance under thermal stress. Their combination of mechanical integrity, machinability, and optical clarity ensures RT18 PMP rods remain vital in demanding industrial and scientific contexts.
Tolerances
Rod
| Diameter | +20% / -10% |
|---|
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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