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DX845 PMP Disk

Available Configurations

Properties common to all products in this list

Grade: DX845 Composition: PMP TPX® Form: Disk Material: Polymethylpentene (PMP, TPX®) Commodity: Polymers Surface Finish: Matt/Gloss Color: Natural
DX845 PMP Disk delivers a rare blend of optical clarity, high thermal stability, and chemical resistance, making it ideal for precision optical and structural applications. With a low density of about 0.833 g/cm³ and a refractive index near 1.46, the disk form ensures excellent light transmission with minimal distortion from UV through infrared wavelengths. Its melting point of ~235–240 °C and negligible water absorption provide dimensional stability in high-temperature and humid environments. The material’s low dielectric constant (~2.1) and high volume resistivity (~10¹⁶ Ω·cm) support its use in high-frequency instrumentation. Industries such as aerospace, photonics, vacuum technology, and laboratory instrumentation employ DX845 PMP Disk for components like terahertz or laser windows, vacuum viewports, and protective optical covers. Its stability under heat and vacuum also benefits acoustic sensor housings and ultrasonic transducer windows. This combination of durability, optical precision, and environmental resilience enables researchers and engineers to design reliable, high-performance systems for both scientific and industrial innovation.
Starting at $227.00 each
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Material Properties

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
each

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Available Configurations

Properties common to all products in this list

Grade: DX845 Composition: PMP TPX® Form: Disc Material: Polymethylpentene (PMP, TPX®) Commodity: Polymers Surface Finish: Matt/Gloss Color: Natural

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Tolerances

Disc
Thickness ±20%