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PET Disk
Available Configurations
Properties common to all products in this list
| Thickness | Diameter | Structure |
|---|---|---|
| 0.006mm to 1.5mm | 4mm to 50.8mm | Amorphous; Biaxially-oriented |
Need custom configurations? Please contact us.
Key Features
Polyethylene Terephthalate (PET) Disc is a precision-cut circular polymer component available in amorphous, semi-crystalline, and biaxially-oriented structures, combining dielectric performance, optical clarity, and chemical resistance in a defined geometry suited to instrumentation, insulation, and research applications:
Three Structural Grades for Tailored Performance
Amorphous PET disc offers superior optical clarity and thermoformability; semi-crystalline grades deliver improved thermal stability and stiffness suited to elevated service temperatures up to 170 °C; and biaxially-oriented PET provides the highest tensile strength — up to 190–260 MPa — alongside the lowest moisture uptake and tightest dimensional stability under load.
Excellent Dielectric Properties (17 kV/mm, >10¹⁴ Ω·cm)
Across all structures, PET discs offer a dielectric strength of 17 kV/mm and volume resistivity above 10¹⁴ Ω·cm, making them a practical drop-in for capacitor and transformer insulation spacers and dielectric separators where reliable electrical isolation in a defined circular geometry is required.
Optical Clarity & Defined Refractive Index (1.58–1.64)
PET discs offer a refractive index of 1.58–1.64 and, in amorphous form, superior optical clarity — supporting their use as optical windows, substrates for thin-film deposition, and components in optical instrument mounts where controlled and consistent light transmission is required.
Chemical Resistance & Low Density (1.3–1.4 g/cm³)
PET discs offer good resistance to dilute acids, alcohols, and oils at a density of just 1.3–1.4 g/cm³, making them suitable for valve seats and sealing elements in analytical instruments exposed to moisture or chemicals where lightweight, chemically resistant components are required.
Wide Thickness Range (0.006 mm to 1.5 mm)
Available from 0.006 mm thin dielectric spacers and optical windows through to 1.5 mm stiffer discs for mechanical and sealing applications, PET discs cover a broad range of precision circular component requirements across multiple structural grades.
Industrial Applications
PET Disc is used across optical, electrical, analytical, and research applications where a precision-cut circular polymer component in a controlled structure and thickness is required:
- ✦ Optical Instrument Mounts & Windows
- The precision-cut circular geometry and refractive index of 1.58–1.64 make PET discs a practical component for optical instrument mounts and windows, where amorphous grades provide superior optical clarity and consistent light transmission in defined circular apertures.
- ✦ Capacitor & Transformer Insulation Spacers
- Used as dielectric spacers and separators in capacitors and transformers, where a dielectric strength of 17 kV/mm and volume resistivity above 10¹⁴ Ω·cm in a precision circular geometry provide reliable electrical isolation as a practical drop-in component.
- ✦ Valve Seats & Sealing Elements
- Applied as valve seats and sealing elements in analytical instruments exposed to moisture or chemicals, where PET's good resistance to dilute acids, alcohols, and oils combined with low density and the precision circular geometry supports lightweight, chemically resistant sealing solutions.
- ✦ Thin-Film Deposition & Surface Modification
- Used in research as standardised substrates for thin-film deposition and surface modification trials, where the precision-cut circular geometry, structural consistency, and defined thickness provide a reproducible platform for experimental programmes requiring controlled PET substrates.
- ✦ Optical Clarity & Polymer Characterisation Studies
- Employed in optical clarity studies under environmental stress and polymer creep characterisation, where the defined circular geometry and availability across amorphous and biaxially-oriented structures allow direct comparison of structural effects on performance under controlled experimental conditions.
Synonyms
Material Properties
| Element | Value |
|---|---|
| Acids - concentrated | Good-Poor |
| Acids - dilute | Good |
| Alcohols | Good |
| Alkalis | Poor |
| Aromatic hydrocarbons | Good-Fair |
| Greases and Oils | Good |
| Halogenated Hydrocarbons | Good-Poor |
| Halogens | Fair-Poor |
| Ketones | Good-Fair |
| Element | Value |
|---|---|
| Coefficient of friction | 0.2-0.4 |
| Hardness - Rockwell | M94-101 |
| Poisson's ratio | 0.37-0.44 |
| Tensile modulus( GPa ) | 02-Apr |
| Izod impact strength( J m⁻¹ ) | 13-35 |
| Tensile strength( MPa ) | 80, for biax film 190-260 |
| Element | Value |
|---|---|
| Dielectric constant @1MHz | 3 |
| Dissipation factor @ 1kHz | 0.002 |
| Dielectric strength( kV mm⁻¹ ) | 17 |
| Surface resistivity( Ohm/sq ) | 10¹³ |
| Volume resistivity( Ohmcm ) | >10¹⁴ |
| Element | Value |
|---|---|
| Flammability | HB |
| Radiation resistance | Good |
| Refractive index | 1.58-1.64 |
| Resistance to Ultra-violet | Fair? |
| Limiting oxygen index( % ) | 21 |
| Water absorption - equilibrium( % ) | 0.7 |
| Water absorption - over 24 hours( % ) | 0.1 |
| Density( gcm⁻³ ) | 1.3-1.4 |
| Element | Value |
|---|---|
| Heat-deflection temperature - 0.45MPa( C ) | 115 |
| Heat-deflection temperature - 1.8MPa( C ) | 80 |
| Lower working temperature( C ) | 20 |
| Upper working temperature( C ) | 115-170 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 1200-1350 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 0.15-0.4@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 20-80 |
Tolerances
| Thickness | ±20% | |
|---|---|---|
| Diameter | ±0.5mm |